Fortran95程序设计课后习题答案(word版方便).docx

第四章
1.program main implicit none write(*,*)"Have a good time."write(*,*)"That's not bad."write(*,*) '"Mary" isn''t my name.' end program
2.program main real, parameter :: PI=3implicit none.14159real radius write(*,*) "请输入半径长 "read(*,*)radius write(*,"('面积 ='f8.3)")radius*radius*PI end program
3.program main implicit none real grades write(*,*)"请输入成绩 "read(*,*)grades write(*,"('调整后成绩为 'f8.3)") SQRT(grades)*10.0 end program
4.integer a,b real ra,rb a=2 b=3 ra=2.0 rb=3.0 write(*,*) b/a! 输出 1,因为使用整数计算,小数部分会无条件舍去write(*,*) rb/ra! 输出 1.5
5.program main implicit none type distance real meter,inch,cm end type type(distance) ::d write(*,*)" 请输入长度 :"read(*,*)d%meter d%cm = d%meter*100 d%inch=d%cm/2.54write(*,"(f8.3'米 ='f8.3' 厘米 ='f8.3' 英寸 ')") d%meter,d%cm, d%inch end program
第五章
1.program main implicit none integer money real tax write(*,*) "请输入月收入"read(*,*) money if ( money<1000 ) then tax = 0.03else if ( money<5000) then tax=0.1else tax=0.15end if write(*,"('税金为 'I8)")nint(money*tax)end program
2.program main implicit none integer day character(len=20) :: tv write(*,*) "请输入星期几 "read(*,*) day select case(day)case(1,4)tv = " 新闻 "case(2,5)tv = " 电视剧"case(3,6)tv=" 卡通 "case(7)tv = " 电影 "case default write(*,*) "错误的输入 "stop end select write(*,*) tv end program
3.program main implicit none integer age, money real tax write(*,*)" 请输入年龄 " read(*,*)age write(*,*)"请输入月收入 "read(*,*)money if (age<50 )then if ( money<1000 ) then tax = 0.03else if ( money<5000 )then tax = 0.10else tax = 0.15end if else if(money<1000) then tax= 0.5else if( money<5000 )then tax = 0.7else tax = 0.10end if end if write(*,"('税金为 'I8)") nint(money*tax) end program
4.program main implicit none integer year, days logical mod_4,mod_100, mod_400 write(*,*)" 请输入年份 "read(*,*) year mod_4= ( MOD(year,4)== 0 )mod_100 = ( MOD(year,100) == 0 )mod_400 = (MOD(year,400) ==0)if ((mod_4.NEQV. mod_100) .or. mod_400 ) then days = 366else days = 365end if write(*,"('这一年有 'I3' 天 ')") days stop end program
第六章
1.program main implicit none integer i do i=1,5write(*,*)"Fortran"end do stop end program
2.program main implicit none integer i,sum sum = 0do i=1,99,2sum = sum+i end do write(*,*) sum stop end program
3.program main implicit none integer,parameter:: answer= 45integer,parameter :: max = 5integer weight, i do i=1,max write(*,*) "请输入体重 "read(*,*) weight if (weight==answer) exit end do if(i<=max ) then write(*,*)" 猜对了 "else write(*,*) "猜错了 "end if stop end program
4.program main implicit none integer, parameter :: max=10integer i real item real ans ans = 1.0item = 1.0do i=2,max item = item/real(i)ans = ans+item
end do write(*,*) ans stop end program
5.program main implicit none integer, parameter :: length = 79character(len=length) :: input,output integer i,j write(*,*)"请输入一个字串 "read(*,"(A79)")input j=1 do i=1, len_trim(input)if ( input(i:i) /= ' ' ) then output(j:j)=input(i:i)j=j+1end if end do write(*,"(A79)") output stop end program
第七章
1.program main implicit none integer,parameter:: max= 10integer i integer:: a(max) =(/ (2*i,i=1,10) /) integer :: t!sum() 是 fortran库函数write(*,*) real(sum(a))/real(max)stop end program
2.integer a(5,5)!5*5=25integer b(2,3,4)!2*3*4=24integer c(3,4,5,6) !3*4*5*6=360 integer d( -5:5)! 11 integer e( -3:3, -3:3)! 7*7=49
3.program main implicit none integer,parameter:: max=10integer f(max)integer i f(1)=0f(2)=1do i=3,max f(i)=f(i -1)+f(i-2)end do write(*,"(10I4)")f stop end program
4.program main implicit none integer,parameter::size=10integer:: a(size)=(/ 5,3,6,4,8,7,1,9,2,10/)integer::i,j integer::t do i=1, size-1do j=i+1,size if ( a(i) < a(j) ) then ! a(i)跟 a(j)交换t=a(i)a(i)=a(j)a(j)=t end if end do end do write(*,"(10I4)")a stop end
5.a(2,2)!1+(2 -1)+(2-1)*(5)=7a(3,3)! 1+(3-1)+(3-1)*(5) = 13
第八章
1.program main implicit none real radius,area write(*,*)" 请输入半径长 " read(*,*) radius call CircleArea(radius, area)write(*,"('面积 = 'F8.3)") area stop end program subroutine CircleArea(radius, area)implicit none real, parameter:: PI=3.14159 real radius, area area = radius*radius*PI return end subroutine
2.program main implicit none real radius real,external:: CircleArea write(*,*)" 请输入半径长 "read(*,*)radius write(*,"('面积 ='F8.3)")CircleArea(radius)stop end program real function CircleArea(radius)implicit none real,parameter:: PI=
3.14159 real radius CircleArea = radius*radius*PI return end function
3.program main implicit none call bar(3)call bar(10)stop end program subroutine bar(length)implicit none integer,intent(in)::length integer i character(len=79)::string string=" "do i=1,length string(i:i)='*'end do write(*,"(A79)") string return end subroutine
4.program main implicit none integer, external :: add write(*,*) add(100) end program recursive integer function add(n)result(sum)implicit none integer, intent(in):: n if ( n<0 ) then sum=0return else if ( n<=1 ) then sum=n return end if sum = n + add(n-1) return end function
5.program main implicit none integer, external :: gcd write(*,*) gcd(18,12) end program integer function gcd(A,B)implicit none integer A,B,BIG,SMALL,TEMP BIG=max(A,B) SMALL=min(A,B)do while(SMALL /= 1 )TEMP=mod(BIG,SMALL)if ( TEMP==0 ) exit BIG=SMALL SMALL=TEMP end do gcd=SMALL return end function
6.program main use TextGraphLib implicit none integer,parameter::maxx=60, maxy=20real,parameter:: StartX=0.0,EndX=3.14159*2.0real,parameter::xinc= (EndX-StartX)/(maxx -1)real x integer i,px,py call SetScreen(60,20)call SetCurrentChar('*')x=StartX do px=1,maxx py= (maxy/2)*sin(x)+maxy/2+1call
PutChar(px,py)x=x+xinc end docall UpdateScreen()stop end program
第九章
1.program main implicit none character(len=79)::character(len=79)::buffer integer,parameter:: fileid = 10integer count integer::status=0logical alive write(*,*)":"read(*,"(A79)")inquire(,exist=alive)if(alive)then open(unit=fileid, , &access="sequential", status="old")count = 0do while(.true.) read(unit=fileid, fmt="(A79)", iostat=status ) buffer if ( status/=0 ) exit!没有资料就跳出循环write(*,"(A79)")buffer count=count+1if( count==24)then pause count=0end if end do else write(*,*)TRIM(),"doesn't exist." end if stop end
2.program main implicit none character(len=79)::character(len=79)::buffer integer, parameter :: fileid = 10integer i integer :: status = 0logical alive write(*,*) ":" read(*,"(A79)")inquire(, exist=alive)if (alive )then open(unit=fileid,,& access="sequential",status="old")do while(.true.)read(unit=fileid,fmt="(A79)", iostat=status)buffer if(status/=0)exit!没有资料就跳出循环do i=1, len_trim(buffer)buffer(i:i) = char( ichar(buffer(i:i))-3 )end do write(*,"(A70)") buffer end do else write(*,*) TRIM()," doesn't exist."end if stop end
3.program main implicit none type student integer chinese, english,math, science, social,total end type type(student)::s,total integer,parameter:: students=20, subjects=5integer i open(10,file="grades.bin",access="direct",recl=1)write(*,"(7A10)") " 座号 "," 中文 "," 英文 "," 数学 "," 自然 "," 社会 "," 总分 "total=student(0,0,0,0,0,0)do i=1, students read(10,rec=(i -1)*subjects+1)s%chinese read(10,rec=(i -1)*subjects+2) s%english read(10,rec=(i -1)*subjects+3)s%math read(10,rec=(i -1)*subjects+4) s%science read(10,rec=(i -1)*subjects+5)s%social s%total= s%chinese+s%english+s%math+s%science+s%social total%chinese= total%chinese+s%chinese total%english= total%english+s%english total%math= total%math+s%math total%science = total%science+s%science total%social=total%social+s%social total%total= total%total+s%total write(*,"(7I10)") i, s end do write(*,"(A10,6F10.3)") " 平均 ", & real(total%chinese)/real(students),&real(total%english)/real(students),& real(total%math)/real(students),&real(total%science)/real(students),& real(total%social)/real(students),&real(total%total)/real(students)stop end
4.program main implicit none character(len=79)::character(len=79)::buffer integer, parameter :: fileid = 10integer i integer :: status = 0logical alive write(*,*) ":"read (*,"(A79)")inquire( , exist=alive)if ( alive ) then open(unit=fileid, , & access="sequential",status="old")do while(.true.)read(unit=fileid,fmt="(A79)", iostat=status)buffer if(status/=0)exit!没有数据就跳出循环do i=1, len_trim(buffer)buffer(i:i)=char(ichar(buffer(i:i)) -(mod(i -1,3)+1))end do write(*,"(A70)")buffer end do else write(*,*)TRIM()," doesn't exist."end if stop end
5.module typedef type student integer::num integer::Chinese,English, Math, Natural, Social integer :: total integer :: rank end type end module program main use typedef implicit none integer,parameter::integer,parameter::students=20 character(len=80):: tempstr type(student) :: s(students) !储存学生成绩type(student) :: total!计算平均分数用integer i,num,error open(fileid,
file="grades.txt",status="old",iostat=error)if( error/=0)then write(*,*)"Open grades.txt fail."stop end if read(fileid,"(A80)")tempstr! 读入第一行文字total=student(0,0,0,0,0,0,0,0)! 用循环读入每位学生的成绩do i=1,students read(fileid,*) s(i)%num, s(i)%Chinese, s(i)%English, &s(i)%Math, s(i)%Natural, s(i)%Social!计算总分s(i)%Total=s(i)%Chinese +s(i)%English+& s(i)%Math + s(i)%Natural + s(i)%Social!累加上各科的分数,计算各科平均时使用total%Chinese =total%Chinese+s(i)%Chinese total%English=total%English+ s(i)%English total%Math=total%Math+ s(i)%Math total%Natural=total%Natural+ s(i)%Natural total%Social= total%Social + s(i)%Social total%Total= total%Total + s(i)%Total end do call sort(s,students)!重新输出每位学生成绩write(*,"(8A7)") "座号 "," 中文 ","英文 "," 数学 "," 自然 "," 社会 "," 总分 "," 名次 "do i=1,students write(*,"(8I7)")s(i)end do!计算并输出平圴分数write(*,"(A7,6F7.1)")"平均 ",& real(total%Chinese)/real(students),&real(total%English)/real(students),&real(total%Math) /real(students),&real(total%Natural)/real(students),&real(total%Social)/real(students),& real(total%Total)/real(students)stop end program subroutine sort(s,n)use typedef implicit none integer n type(student) :: s(n), t integer i,j do i=1,n -1do j=i+1,n if ( s(i)%total < s(j)%total ) then t = s(i)s(i)=s(j)s(j) = t end if end do end do forall(i=1:n)s(i)%rank = i end forall end subroutine
第十章
1.integer(kind=4):: a! 4bytes real(kind=4):: b! 4 bytes real(kind=8):: c!8bytes character(len=10):: str!10bytes integer(kind=4),pointer:: pa ! 4 bytes real(kind=4), pointer :: pb! 4 bytes real(kind=8), pointer :: pc! 4 bytes character(len=10), pointer :: pstr ! 4 bytes type student integer Chinese, English, Math end type type(student) :: s! 12 bytes type(student), pointer :: ps ! 4 bytes
2.integer, target :: a = 1 integer, target :: b = 2 integer, target :: c = 3 integer, pointer :: p p=>a
write(*,*) p! 1 p=>b write(*,*) p! 2 p=>c p=5 write(*,*) c! 5
3.module linklist type student integer :: num integer :: Chinese, English, Math, Science, Social end type type datalink type(student) :: item type(datalink), pointer :: next end type contains function SearchList(num, head)implicit none integer:: num type(datalink),pointer::head,p type(datalink),pointer::SearchList p=>head nullify(SearchList) do while( associated(p) )if ( p%item%num==num ) then SearchList => p return end if p=>p%next end do return end function end module linklist program ex1016use linklist implicit none character(len=20)::character(len=80):: tempstr type(datalink),pointer::head type(datalink),pointer:: p type(student), allocatable :: s(:)integer i,error,size write(*,*) ":"read(*,*)open(10, , status="old", iostat=error)if ( error/=0 ) then write(*,*) "Open !"stop end if allocate(head) nullify(head%next)p=>head size=0read(10, "(A80)") tempstr !读入第一行字符串 ,不需要处理它!读入每一位学生的成绩do while(.true.)read(10,fmt=*,iostat=error) p%item if( error/=0) exit size=size+1allocate(p%next,stat=error)! 新增下一个数据if ( error/=0 ) then write(*,*) "Out of memory!"stop end if p=>p%next !移动到链表的下一个数据nullify(p%next)end do write(*,"('总共有 ',I3,'位学生 ')")size allocate(s(size))p=>head do i=1,size s(i)=p%item p=>p%next end do do while(.true.)write(*,*) "要查询几号同学的成绩?"read (*,*) i if ( i<1 .or. i>size ) exit !输入不合理的座号write(*,"(5(A6,I3))")"中文 ",s(i)%Chinese,&
" 英文 ",s(i)%English,&" 数学 ",s(i)%Math,&" 自然",s(i)%Science,&" 社会 ",s(i)%Social end do write(*,"(' 座号 ',I3,' 不存在 ,程序结束 .')") i stop end program
4.module typedef implicit none type:: datalink integer:: i type(datalink), pointer:: next end type datalink end module typedef program ex1012use typedef implicit none type(datalink) , pointer :: p, head, next integer :: i,n,err write(*,*) 'Input N:'read(*,*) n allocate( head )head%i=1nullify(head%next)p=>head do i=2,n allocate(p%next,stat=err )if (err/= 0)then write(*,*)'Out of memory!' stop end if p=>p%next p%i=i end do nullify(p%next)p=>head do while(associated(p))write(*,"(i5)") p%i p=>p%next end do!释放链表的存储空间p=>head do while(associated(p))next => p%next deallocate(p)p=>next end do stop end program
第十一章
1.module utility implicit none interface area module procedure CircleArea module procedure RectArea end interface contains real function CircleArea(r)real, parameter:: PI=3.14159real r CircleArea=r*r*PI return end function real function RectArea(a,b)real a,b RectArea=a*b return end function end module program main use UTILITY implicit none write(*,*) area(1.0)write(*,*) area(
2.0,
3.0) stop end program
2.module time_utility implicit none type :: time integer::hour,minute,second end type time interface operator(+)module procedure add_time_time end interface contains function add_time_time( a, b )implicit none type(time) :: add_time_time type(time),intent(in)::a,b integer::seconds,minutes,carry seconds=a%second+b%second carry=seconds/60 minutes=a%minute+b%minute+carry carry=minutes/60 add_time_time%second=mod(seconds,60)add_time_time%minute=mod(minutes,60) add_time_time%hour=a%hour+b%hour+carry return end function add_time_time subroutine input( a )implicit none type(time), intent(out) :: a write(*,*) " Input hours:"read(*,*)a%hour write(*,*)"Input minutes:"read(*,*)a%minute write(*,*)"Input seconds:"read (*,*)a%second return end subroutine input subroutine output( a )implicit none type(time), intent(in)::a write(*,"(I3,' hours',I3,' minutes',I3,' seconds')" ) a%hour,a%minute,a%second return end subroutine output end module time_utility program main use time_utility implicit none type(time):: a,b,c call input(a)call input(b)c=a+b call output(c)stop end program main
3.module rational_utility implicit none private public:: rational, & operator(+),operator( -),operator(*),&operator(/),assignment(=),operator(>),& operator(<),operator(==), operator(/=),&output,input type:: rational integer :: num,denom end type rational interface operator(+)module procedure rat__rat_plus_rat end interface interface operator( -)module procedure rat__rat_minus_rat end interface interface operator(*)module procedure rat__rat_times_rat end interface interface operator(/)module procedure rat__rat_div_rat end interface interface assignment(=)module procedure rat_eq_rat module procedure int_eq_rat module procedure real_eq_rat end
interface interface operator(>)module procedure rat_gt_rat end interface interface operator(<)module procedure rat_lt_rat end interface interface operator(==) module procedure rat_compare_rat end interface interface operator(/=)module procedure rat_ne_rat end interface contains function rat_gt_rat(a,b)implicit none logical :: rat_gt_rat type(rational),intent(in)::a,b real::fa,fb fa=real(a%num)/real(a%denom)fb=real(b%num)/real(b%denom)if(fa>fb ) then rat_gt_rat=.true.else rat_gt_rat=.false.end if return end function rat_gt_rat function rat_lt_rat(a,b)implicit none logical:: rat_lt_rat type(rational),intent(in)::a,b real::fa,fb fa=real(a%num)/real(a%denom) fb=real(b%num)/real(b%denom)if( fb>fa) then rat_lt_rat=.true.else rat_lt_rat=.false.end if return end function rat_lt_rat function rat_compare_rat(a,b)implicit none logical:: rat_compare_rat type(rational), intent(in)::a,b type(rational)::c c=a-b if ( c%num==0)then rat_compare_rat=.true.else rat_compare_rat=.false.end if return end function rat_compare_rat function rat_ne_rat(a,b)implicit none logical:: rat_ne_rat type(rational),intent(in)::a,b type(rational):: c c=a-b if ( c%num==0)then rat_ne_rat=.false.else rat_ne_rat=.true.end if return end function rat_ne_rat subroutine rat_eq_rat(rat1, rat2)implicit none type(rational),intent(out)::rat1type(rational),intent(in)::rat2rat1%num= rat2%num rat1%denom=rat2%denom return end subroutine rat_eq_rat subroutine int_eq_rat( int, rat )implicit none integer, intent(out):: int type(rational), intent(in):: rat int= rat%num/rat%denom return end subroutine int_eq_rat subroutine real_eq_rat( float,rat)implicit none real,intent(out)::float type(rational),intent(in):: rat float = real(rat%num) / real(rat%denom)return end subroutine real_eq_rat function reduse( a )implicit none type(rational), intent(in)::a integer::b type(rational)::reduse b=gcv_interface(a%num,a%denom)reduse%num=a%num/b reduse%denom= a%denom/b return end function reduse function gcv_interface(a,b)implicit none integer, intent(in) :: a,b integer :: gcv_interface if ( min(a,b) .eq. 0 ) then gcv_interface=1return end if if(a==b)then gcv_interface=a return else if(a>b)then gcv_interface=gcv(a,b)else if(a<b)then gcv_interface=gcv(b,a)end if return end function gcv_interface recursive function gcv(a,b) result(ans)implicit none integer, intent(in) :: a,b integer:: m integer :: ans m=mod(a,b)select case(m)case(0)ans=b return case(1)ans=1return case default ans=gcv(b,m)end select return end function gcv function rat__rat_plus_rat( rat1,rat2)implicit none type(rational) :: rat__rat_plus_rat type(rational), intent(in) :: rat1,rat2type(rational) :: act act%denom= rat1%denom * rat2%denom act%num= rat1%num*rat2%denom + rat2%num*rat1%denom rat__rat_plus_rat =reduse(act)return end function rat__rat_plus_rat function rat__rat_minus_rat(rat1,rat2)implicit none type(rational):: rat__rat_minus_rat type(rational),intent(in)::rat1,rat2 type(rational):: temp temp%denom= rat1%denom*rat2%denom temp%num= rat1%num*rat2%denom- rat2%num*rat1%denom rat__rat_minus_rat= reduse(temp) return end function rat__rat_minus_rat function rat__rat_times_rat(rat1,rat2)
implicit none type(rational) :: rat__rat_times_rat type(rational), intent(in) :: rat1, rat2 type(rational):: temp temp%denom= rat1%denom*rat2%denom temp%num= rat1%num *rat2%num rat__rat_times_rat= reduse(temp)return end function rat__rat_times_rat function rat__rat_div_rat( rat1,rat2)implicit none type(rational) :: rat__rat_div_rat type(rational), intent(in) :: rat1, rat2type(rational) :: temp temp%denom= rat1%denom*rat2%num temp%num= rat1%num* rat2%denom rat__rat_div_rat =reduse(temp)return end function rat__rat_div_rat subroutine input(a)implicit none type(rational),intent(out):: a write(*,*)" 分子 :"read(*,*)a%num write(*,*)" 分母 :"read(*,*)a%denom return end subroutine input subroutine output(a)implicit none type(rational), intent(in) :: a if ( a%denom/=1 ) then write(*, "(' (',I3,'/',I3,')' )" ) a%num,a%denom else write(*,"(I3)" )a%num end if return end subroutine output end module rational_utility program main use rational_utility implicit none type(rational) :: a,b,c call input(a)call input(b)c=a+b write(*,*)"a+b="call output(c)c=a-b write(*,*)"a -b="call output(c)c=a*b write(*,*)"a*b="call output(c)c=a/b write(*,*)"a/b="call output(c)if (a>b) write(*,*) "a>b"if (a<b) write(*,*) "a<b"if (a==b) write(*,*) "a==b"if (a/=b) write(*,*) "a/=b" stop end program main
4.module vector_utility implicit none type vector real x,y end type interface operator(+)module procedure vector_add_vector end interface interface operator( -) module procedure vector_sub_vector end interface interface operator(*)module procedure real_mul_vector module procedure vector_mul_real module procedure vector_dot_vector end interface interface operator(.dot.)module procedure vector_dot_vector end interface contains type(vector) function vector_add_vector(a,b) type(vector), intent(in) :: a,b vector_add_vector = vector(a%x+b%x, a%y+b%y)end function type(vector) function vector_sub_vector(a,b)type(vector),intent(in)::a,b vector_sub_vector= vector(a%x-b%x, a%y-b%y)end function type(vector)function real_mul_vector(a,b)real, intent(in):: a type(vector),intent(in)::b real_mul_vector = vector(a*b%x, a*b%y)end functiontype(vector)function vector_mul_real(a,b) type(vector), intent(in) :: a real, intent(in) :: b vector_mul_real = real_mul_vector(b,a) end function real function vector_dot_vector(a,b)type(vector), intent(in) ::a,b vector_dot_vector= a%x*b%x+a%y*b%y end function subroutine output(vec) type(vector) :: vec write(*,"('('F6.2','F6.2')')")vec end subroutine end module program main use vector_utility implicit none type(vector)a,b,c a=vector(1.0, 2.0) b=vector(2.0, 1.0)c=a+b call output(c)c=a-b call output(c)write(*,*)a*b end program main。