Chap5 Exercise

Chapter Five Exercises一、Exercises:1. From A,B,C,D, choose an answer:(1). which is the correct string assignment ?A. string s=“abcde”;B. static char s[ ]={“abcde”};C. str s=”abcde”;D. char s=”abcde”;(2).If : int *p ,m=5,n; From A,B,C,D, choose an answer which is the correct one.A. p=&n; scanf(“%d”, &p);B. p=&n; scanf(“%d”,*p);C. scanf(“%d”,&n);*p=n;D.p=&n; *p=m;(3). Following judge correct one is:A. char *a=”china”; equals : char *a; *a=”china”;B. char str[10]={“china”}; equals: char str[10];str[]={“china”};C. char *s=”china”;equals: char *s;s=”china”;D. char c[4]=”abc”,d[4]=”abc”;equals: char c[4]=d[4]=”abc”;(4). If : int k=2, p1,p2;p1=&k;p2=&k; wrong statement is :A. k=*p1+*p2;B. p2=k;C. p1=p2;D.k=*p1*(*p2);(5). Following segment What gets printed?________char a[]=”language”,*p;p=a;while(*p!=‟u‟) {printf(“%c”,*p-32);p++}A. LANGUAGEB. languageC. LANGD. langUAGE(6). If : char *s=”abcde”; s+=2;printf(“%d”,s);What gets printed? ________A. cdeB. cC. address of …c‟D. no ensure output(7) Choose Result of the programs. ________main(){ int y=30；prt(&y)；}prt(int *x){ printf("%d,%d\n",*x,++*x)；}A.30,30B.31,31C.30,31D.31,32(8) Choose Result of the programs________s( char *s ){ c har *p = s；while( *p ) p++；return( p - s )；}main(){ c har *a = "abded"；int i；i = s(a)；printf("%d",i )；}A.4B.6C.5D.7(9). Which is the correct answer ? _________#include <stdio.h>void main(void){int *p_i,i,a[]={1,2,3,4};i=0;p_i=&i;*p_i=a[2];printf("i=%d",i);}A. i=2;B. i=3;C. i=4;D.i=0;(10). Which is the correct answer ? _________#include <stdio.h>void main(void){int i,a[]={1,2,3,4},*p_a[4];i=0;p_a[1]=&i;p_a[0]=&a[0];printf("*p_a[0]=%d,*p_a[1]=%d",*p_a[0],*p_a[1]); }A. *p_a[0]=0,*p_a[1]=1;B. *p_a[0]=1,*p_a[1]=2;C. *p_a[0]=1,*p_a[1]=0;D. *p_a[0]=1,*p_a[1]=1;(11). Which is the correct answer ? _________#include <stdio.h>void main(void){int i,b[]={10,11,12,13},*p_b[4];i=1;p_b[i]=&i;p_b[2]=&b[*p_b[i]];printf("*p_b[2]=%d",*p_b[2]);}A. *p_b[2]=10;B. *p_b[2]=11;C. *p_b[2]=12;D. *p_b[2]=13;(12). Which is the correct answer ? _________#include <stdio.h>void main(void){int *p_i, i ,b[]={10,20,30,40};p_i=b;i=*(p_i+2);printf("i=%d",i);}A. i=10;B. i=12;C. i=20;D. i=30;(13). Which is the correct answer ? _________#include <stdio.h>void main(void){int *p_i,i,b[2][4]={11,12,13,14,21,22,23,24};p_i=b[1];i=*(p_i+2);printf("i=%d",i);}A. i=11;B. i=12;C. i=22;D. i=23;(14). Which is the correct answer ? _________#include <stdio.h>void main(void){int *p_i,i,b[2][4]={11,12,13,14,20,30,23,24};p_i=b[1];i=*p_i+2;printf("i=%d",i);}A. i=14;B. i=20;C. i=22;D. i=23;(15). Which is the correct answer ? _________#include <stdio.h>void main(void){char c[]={'a','a','a','a'};c[0]=c[0]+1;c[1]=c[1]+2;c[2]=c[2]+3;c[3]=c[3]+4;printf("%c%c%c%c",c[0],c[1],c[2],c[3]);}A. cccc;B.aaaa;C. abcd;D. bcde;(16). Which is the correct answer ? _________#include <stdio.h>void main(void){char c[]={'a','b','c','d','\0'},*p_c;p_c=c;c[2]=c[2]-c[3]+1;printf("%s",c);}A. a;B.ab;C. abc;D. abcd;(17). Which is the correct answer ? _________#include <stdio.h>void main(void){char c[]={'a','b','c','d','\0'};int i, *p_i, a[]={1,2,3,4};for (i=0;i<4;i++)a[i]=a[i]+c[i];printf("%d,%d,%d,%d\n",a[0],a[1],a[2],a[3]);}A. 1,2,3,4;B.97,98,99,100;C. a,b,c,d;D. 98,100,102,104;(18). Which is the correct answer ? _________#include <stdio.h>void main(void){char c[]={'a','b','c','d','\0'};int a[]={1,2,3,4},aa[2][3]={1,2,3,4,5,6};c[1]=c[1]+a[1];c[2]=c[2]+*aa[1];printf("%s",c);}A. abcd;B.a;C. adcd;D. adgd;(19). Which is the correct answer ? _________#include <stdio.h>void main(void){int i,a[]={1,2,3,4},*p_a[4];char c[]={'5','6','7','8'};for (i=0;i<4;i++){p_a[i]=&a[i];c[i]=c[i]-*p_a[i];}printf("%d,%d,%d,%d ; %c%c%c%c ",c[0],c[1],c[2],c[3] ,c[0],c[1],c[2],c[3]);printf("%c%c%c%c\n",c[0],c[1],c[2],c[3]);}A. 52,52,52,52 ; 4444;B. 4,5,6,7 ; 4,4,4,4C. 5,6,7,8 ; 5,6,7,8;D. 4,5,6,7 ; 4,5,6,7;2. What is wrong ? Explain.(1) main(){int *p=&a;int a;printf("%d\n",*p);}(2) main(){int x,*p;x=10;*p=x; ________printf(“%d,%d\n”,x,*p);}(3) main(){float x=3.4;int *p; _______p=&x;printf(“%f\n”,*p);}(4) main(){char *pt,str[20];_______str=”Hello”;_____printf(“What is your name ?\n”);scanf(“%s”,pt);printf(“%s,%s\n”,str,pt);}(5) main(){int a[]={0,2,4,6,8},*p=a+3;printf("%s%d%s\n","a[?]=",*p,"?","a[?+1]=",*p+1,"?"); }3.What gets printed? Explain.(1) main(){static char a[]="Language", b[]="programe";char *p1,*p2; int k;p1=a;p2=b;for(k=0;k<=7;k++)if (*(p1+k)==*(p2+k)) printf("%c",*(p1+k));}(2) main(){ char *p="*****";char *p1=p+4;for(;p1>=p;p1--)printf("%s\n",p1);}(3) sub(int x, int y, int *z){*z=y-x;}main(){int a,b,c;sub(10,5,&a);sub(7,a,&b);sub(a,b,&c);printf(“%4d,%4d,%4d\n”,a,b,c);}(4) #include <stdio.h>ss(char *s){ char *p=s；while(*p) p++；return(p-s)；}main(){ char *a="abded"；int i；i=ss(a)；printf("%d \n",i)；}(5) int fun(int x,int y,int *cp,int *dp){ *cp=x+y；*dp=x-y；}main(){ int a=30,b=50,c,d；fun(a,b,&c,&d)；printf("%d,%d\n",c,d)；}(6) #include <string.h>main(){ char *a="abcdefgh"；fun(a)；puts(a)；}fun(char *s){ int x=0,y；char c；for(y=strlen(s)-1；x<y；x++,y--){ c=s[x]；s[x]=s[y]；s[y]=c；}}二、Experiments:1. following program gets substring at a string, What is wrong with the program? Correct the program.#include “stdio.h”char *subs(char s,int n,int m){char *p;int j;p=s;while(*p++!=NULL) j++;if(n<0||m<0||m<n||m>j){printf(“Substring invidal!\n”);exit(0);}p=s+n;(p+m+1)=‟\0‟;return(p);}main(){char *s1=”The C programming Language!”;clrscr();printf(“%s\n”,subs(s1,5,16)); }2、Understand the sample ,then fill the blanks with the element of the array to get same result as sample.Sample:#include "stdio.h"#define M 5main(){int a[M]={1,2,3,4,5};int i,j,t;i=0;j=M-1;while(i<j){t=*(a+i);*(a+i)=*(a+j);*(a+j)=t;i++;j--;}for(i=0;i<M;i++)printf("%d",*(a+i));}Complete the following program with the elements of the array:#include "stdio.h"#define M 5void main( void ){int a[M]={1,2,3,4,5};int i,j,t;i=0;j=M-1;while(i<j){t=a________;________=a________;a[j]= ________;i++;j--;}for(i=0;i<M;i++)printf("%d",________);}3. .Complete the following program to convert the string into uppercase ,then modify it to conver the string into lowercase. How many implements you can supply?#include "stdio.h"void main(void ){char str[20]="Hello World,123!";int i;printf("The original string is:%s\n",str);i=0;while(str[i]!='\0'){if ((str[i]>='a')&&(str[i]<= ________))str[i]= ________;i++;}printf("After converted,the string is:%s\n",str);}。