北工大 c语言题库

求1 + 1/2! +....+ 1/n!#include "stdio.h"int main( ){int ri,repeat;int i,n;double s;double fact(int n);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d",&n);s=0;for(i=1;i<=n;i++)s=s+1/fact(i);printf("%0.4f\n",s);}return 0;}double fact(int n){int i;double result;result=1;for(i=1;i<=n;i++)result=result*i;return result;}统计一个整数中数字的个数#include "stdio.h"int main( ){int ri,repeat;int count;long in;int countdigit(long number, int digit); scanf("%d",&repeat); #include "stdio.h"int main( ){int ri,repeat;int i,n,j;float s,t;scanf("%d",&repeat); for(ri=1;ri<=repeat;ri++){scanf("%d",&n);s=0;for(i=1;i<=n;i++){t=1;for(j=1;j<=i;j++)t=t*j;s=s+1.0/t;}printf("%0.4f\n",s); }}for(ri=1;ri<=repeat;ri++){scanf("%ld",&in);count=countdigit(in,2);printf("count=%d\n",count); }}int countdigit(long number, int digit) {int i,count=0,t;if(number<0)number=-number;for(i=1; ;i++){t=number%10;if(t==digit)count++;number=number/10;if(number==0)break;}return count;}统计素数并求和#include "stdio.h"#include "math.h"int main( ){int ri,repeat;int count, i, m, n, sum;int prime(int m);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d", &m, &n);sum=0;count=0;for(i=m;i<=n;i++){if(prime(i)==1){count++;sum=sum+i;}}printf("count=%d, sum=%d\n", count, sum); #include "stdio.h"#include "math.h"int main( ){int ri,repeat;int count, digit, i, j, k, m, n, sum;scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d", &m, &n);count=0;sum=0;digit=0;for(i=m;i>=m&&i<=n;i++){for(j=2;j<=n/2;j++)if(i%j==0)break;if(j>i/2&&i!=1){count++;sum=sum+i;}}printf("count=%d,sum=%d\n", count, sum);}int prime(int m){int i;if(m==1)return 0;if(m>1){for(i=2;i<=m/2;i++){if(m%i==0){return 0;}}if(i>m/2) return 1;}}求完数#include "stdio.h"int main( ){int ri,repeat;int i, m, n;long factorsum(int number);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d", &m, &n);for(i=m;i<=n;i++){if(i==factorsum(i))printf("%d ", i);}printf("\n");}}long factorsum(int number) {int i,sum=0;if(number==1) return 1;for(i=1;i<number;i++){if(number%i==0)sum=sum+i;}return sum;}输出 Fibonacci 序列#include "stdio.h"#include "math.h"int main( ){int ri,repeat;int i, m, n;long f;long fib(int n);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d", &m, &n);for(i=1; ;i++){f=fib(i);if(f>=m&&f<=n) printf("%ld ", f);if(f>n) break;}printf("\n");}return 0;}long fib(int n){int i,a=1,b=1,t;if(n==1) return 1;if(n==2) return 1;for(i=3;i<=n;i++){t=a+b;a=b;b=t;}return t;}求各位数字的立方和等于它本身的数#include "stdio.h"int main( ){int ri,repeat; Fibonacci序列的前十项X1=1;X2=1;Printf(“%6d%6d”,x1,x2); For(i=1;i<=8;i++){X=x1+x2;Printf(“%6d”,x);X1=x2;X2=x;int i, m, n;int is(int number);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d", &m, &n);for(i=m;i<=n;i++){if(i==is(i))printf("%d ", i);}printf("\n");}return 0;}int is(int number){int t,sum=0;do{t=number%10;sum=sum+t*t*t;number=number/10;}while(number!=0);return sum;}将一个整数逆序输出#include <stdio.h>int main( ){int ri, repeat;long in, res,k;long reverse(long number);scanf("%d", &repeat);for(ri=1; ri<=repeat; ri++){scanf("%ld", &in);if(in<0){in=-in;k=1;}else k=0;res=reverse(in);if(k==1)res=-res;printf("%ld\n", res);}}long reverse(long number){int a,b;b=0;while(number!=0){a=number%10;b=b*10+a;number=number/10;}return b;}循环移动（调试示例error08_1）#include <stdio.h>void mov(int *x, int n, int m);int main(void){int i, m, n,*p;int a[80];scanf("%d%d", &n, &m);for(i = 0; i < n; i++)scanf("%d", &a[i]);mov(a,n,m);printf("After move: ");for(i = 0; i < n; i++)printf("%d ", a[i]);printf("\n");}void mov(int *x,int n,int m){int i,j,k;for(i=0;i<m;i++){k=x[n-1];for(j=n-1;j>0;j--)x[j]=x[j-1];x[0]=k;}}在数组中查找指定元素#include <stdio.h>int main(void){int i, index, n, res, x;int repeat, ri;int a[10];int search(int list[], int n, int x);scanf("%d", &repeat);for(ri = 1; ri <= repeat; ri++){scanf("%d", &n);for(i = 0; i < n; i++)scanf("%d", &a[i]);scanf("%d", &x);res=search(a,n,x);if(res != -1)printf("index = %d\n", res);elseprintf("Not found\n");}}int search(int list[],int n,int x){int i,res;res=-1;for(i=0;i<n;i++)if(list[i]==x)res=i;return res;}使用函数的选择法排序#include <stdio.h>void sort(int a[],int n);int main(void){int i, n;int repeat, ri;int a[10];scanf("%d", &repeat);for(ri = 1; ri <= repeat; ri++){scanf("%d", &n);for(i = 0; i < n; i++)scanf("%d", &a[i]);sort(a,n);printf("After sorted: ");for(i = 0; i < n; i++)printf("%d ", a[i]);printf("\n");}}void sort(int *p,int n){int k,i,index,t;for(k=0;k<n-1;k++){index=k;for(i=k+1;i<n;i++)if(p[i]<p[index])index=i;t=p[index];p[index]=p[k];p[k]=t;}}使用函数删除字符串中的字符#include<stdio.h>void main(){char c;char str[80];int repeat, ri;void delchar(char *str, char c);scanf("%d", &repeat);getchar();for(ri = 1; ri <= repeat; ri++){gets(str);scanf("%c", &c);getchar();/*---------*/delchar(str,c);printf("result: ");puts(str);}}/*---------*/void delchar(char *str,char c){int i,j;for(i=j=0;str[i]!='\0';i++){if(str[i]!=c)str[j++]=str[i];}str[j]='\0';}使用函数实现字符串复制#include<stdio.h>#include<string.h>void main(){char s[80], t[80];int m;int repeat, ri;void strmcpy(char *s,char *t, int m);scanf("%d", &repeat);getchar();for(ri = 1; ri <= repeat; ri++){gets(t);scanf("%d", &m);getchar();if(strlen(t) < m)printf("error input");else{/*---------*/strmcpy(s,t,m);puts(s);}}}void strmcpy(char *s,char *t,int m){int i,j;j=0;for(i=m-1;t[i]!='\0';i++)s[j++]=t[i];s[j]='\0';}/*---------*/判断回文字符串#include <stdio.h>void main(){char s[80];int repeat, ri;int mirror(char *p);scanf("%d", &repeat);getchar();for(ri = 1; ri <= repeat; ri++){gets(s);if(mirror(s) != 0)printf("YES\n");elseprintf("NO\n");}}/*---------*/int mirror(char *p){char *q;q=p;while(*q!='\0')q++;p--;while(p<q){if(*p!=*q)return 0;p++;q--;}return 1;}分类统计字符个数#include<stdio.h>void main()char s[80];char *p;int blank, digit, lower, other, upper;gets(s);upper = lower = blank = digit = other = 0;/*---------*/for(p=s;*p!='\0';p++)if(*p>='A'&&*p<='Z')upper++;else if(*p>='a'&&*p<='z')lower++;else if(*p>='0'&&*p<='9')digit++;else if(*p==' ')blank++;elseother++;printf("upper: %d lower: %d blank: %d digit: %d other: %d\n", upper, lower, blank, digit, other);}显示水果的价格#include <stdio.h>int main(void){int ri, repeat;int choice;float price;scanf("%d", &repeat);for(ri=1; ri<=repeat; ri++){printf("[1] apples\n");printf("[2] pears\n");printf("[3] oranges\n");printf("[4] grapes\n");scanf("%d", &choice);if(choice==0)printf("price=0");switch(choice){case 1:price=3.00;break;case 2:price=2.50;break;case 3:price=4.10;break;case 4:price=10.20;break;}printf("price=%.2f\n", price);}return 0;}求n!#include <stdio.h>int main(void){int ri, repeat;int i, n;double fact;scanf("%d", &repeat);for(ri=1; ri<=repeat; ri++){scanf("%d", &n);fact=1;for(i=1;i<=n;i++)fact=fact*i;printf("%.0f\n", fact);}return 0;}求最大值#include <stdio.h>int main( ){int ri, repeat;int i , max, n, x;scanf("%d", &repeat);for(ri=1; ri<=repeat; ri++){scanf("%d", &n);max=n;for(i=1;i<=n;i++){scanf("%d",&x);if(max<x)max=x;}printf("%d\n", max);}return 0;}求整数的位数以及各位数之和#include <stdio.h>int main( ){int ri, repeat;int number, sum;long in;scanf("%d", &repeat);for(ri=1; ri<=repeat; ri++){number=0;sum=0;scanf("%ld", &in);if(in<0)in=-in;do{sum=sum+in%10;in=in/10;number++;}while(in!=0);printf("number=%d, sum=%d\n", number, sum);}}求a＋aa＋aaa＋aa…a#include <stdio.h>void main(){int ri, repeat;int i, n;long int a, sn, tn;scanf("%d", &repeat);for(ri=1; ri<=repeat; ri++){scanf("%ld%d", &a, &n);sn=a;tn=a;for(i=1;i<=n-1;i++){tn=10*tn+a;sn=sn+tn;}printf("%ld\n",sn);}}求平均值#include <stdio.h>int main(void){int i, n, sum;int repeat, ri;int a[10];double aver;scanf("%d", &repeat);for(ri = 1; ri <= repeat; ri++){scanf("%d", &n);sum=0;for(i = 0; i < n; i++){scanf("%d", &a[i]);sum=sum+a[i];}aver=sum/(n*1.0);printf("average = %.2f\n", aver);}}交换最小值和最大值#include <stdio.h>int main(void){int i, index, n, t;int repeat, ri;int a[10];scanf("%d", &repeat);for(ri = 1; ri <= repeat; ri++){scanf("%d", &n);for(i = 0; i < n; i++)scanf("%d", &a[i]);index=0;for(i=0;i<n;i++)if(a[i]<a[index])index=i;t=a[0];a[0]=a[index];a[index]=t;for(i=0;i<n;i++)if(a[i]>a[index])index=i;t=a[n-1];a[n-1]=a[index];a[index]=t;printf("After swap: ");for(i = 0; i < n; i++)printf("%d ", a[i]);printf("\n");}}将数组中的数逆序存放#include <stdio.h>int main(void){int i, n, temp;int repeat, ri;int a[10];scanf("%d", &repeat);for(ri = 1; ri <= repeat; ri++){scanf("%d", &n);for(i = 0; i < n; i++)scanf("%d", &a[i]);for(i=0;i<n/2;i++){temp=a[i];a[i]=a[n-1-i];a[n-1-i]=temp;}for(i = 0; i < n; i++)printf("%d ", a[i]);printf("\n");}}选择法排序#include <stdio.h>int main(void){int i, index, k, n, temp;int repeat, ri;int a[10];scanf("%d", &repeat);for(ri = 1; ri <= repeat; ri++){scanf("%d", &n);for(i = 0; i < n; i++)scanf("%d", &a[i]);for(k=0;k<n-1;k++){index=k;for(i=k+1;i<n;i++)if(a[i]>a[index])index=i;temp=a[index];a[index]=a[k];a[k]=temp;}printf("After sorted: ");for(i = 0; i < n; i++)printf("%d ", a[i]);printf("\n");}}调试示例error09_1.cpp#include <stdio.h>int main (void){int i, n;struct emp{char name[10];double jbg;double fdg;double zc;} s[10];scanf("%d", &n);for(i=0;i<n;i++)scanf("%s%lf%lf%lf",s[i].name,&s[i].jbg,&s[i].fdg,&s[i].zc);for (i = 0; i < n; i++)printf ("%5s 实发工资：%7.2f\n", s[i].name, s[i].jbg + s[i].fdg - s[i].zc);return 0;}计算平均成绩#include <stdio.h>int main(void){int i, n;double average, sum=0;struct student{int num;char name[10];int score;}s[10];scanf("%d", &n);for(i=1;i<=n;i++){scanf("%d%s%d",&s[i].num,s[i].name,&s[i].score);sum=sum+s[i].score;}average=sum/n;printf("average: %.2f\n", average);}查找书籍#include <stdio.h>int main (void){int i, max_index, min_index, n;double x;struct book{char name[50];double price;}book[10];scanf("%d", &n);getchar();for(i = 0; i < n; i++){gets(book[i].name);scanf("%lf", &x);getchar();book[i].price = x;}min_index=0;for(i=0;i<n;i++){if(book[i].price<book[min_index].price){min_index=i;}}max_index=0;for(i=0;i<n;i++){if(book[i].price>book[max_index].price){max_index=i;}}printf("highest price: %.1f, %s\n", book[max_index].price, book[max_index].name);printf("lowest price: %.1f, %s\n", book[min_index].price, book[min_index].name);return 0;}找出总分最高的学生（改错题error09_2）#include <stdio.h>int main (void){int i, j, k, max_index, n;struct student{int number;char name[20];int score[3];int sum;}stu[10];scanf("%d", &n);/*---------*/for(i=0;i<n;i++){scanf("%d",&stu[i].number);scanf("%s",stu[i].name);scanf("%d",&stu[i].score[0]);scanf("%d",&stu[i].score[1]);scanf("%d",&stu[i].score[2]);stu[i].sum=stu[i].score[0]+stu[i].score[1]+stu[i].score[2];}max_index=0;for(i=0;i<n;i++){if(stu[i].sum>stu[max_index].sum)max_index=i;printf("总分最高的学生是: %s，%d分", stu[max_index].name, stu[max_index].sum);}计算两个复数之积#include <stdio.h>int main(void){struct complex{int real;int imag;}product, x, y;scanf("%d%d%d%d", &x.real, &x.imag, &y.real, &y.imag);product.real=x.real*y.real-x.imag*y.imag;product.imag=x.real*y.imag+y.real*x.imag;printf("(%d+%di) * (%d+%di) = %d + %di\n", x.real, x.imag, y.real, y.imag, product.real, product.imag);return 0;}#include<stdio.h>Int main(void){Printf(“Hello World!\n”);Return 0;}1~100 间所有偶数的和#include<stdio.h>Int main(void){Int i, sum=0;For(i=1; i<=100; i++)If(i%2==0)Sum=sum+i;Printf(“%d”,sum);Return 0;}求分段函数#include<stdio.h>Int main(void){Double x,y;Printf(“Enter x (x>=0):\n”);Scanf(“%lf”,&x);if(x<=15)Y=4*x/3;ElseY=2.5*x-10.5;Printf(“f(%f)=%.2f\n”,x,y);Return 0;}求1+2+......+n#include<stdio.h>Int main(void){Int i, sum, n;Printf(“Enter n:”);Scanf(“%d”,&n);Sum=0;For(i=1;i<=n;i++)Sum=sum+i;Printf(“sum=%d\n”,sum);Return 0;}求1-1/3+1/5-1/7+...共n项之和#include<stdio.h>Int main(void){Int denominator, flag, i, n;Double item, sum;Printf(“Enter n:”);Scanf(“%d”,&n);Flag=1;Denominator=1;Sum=0;For(i=1;i<=n;i++){Item=flag*1.0/denominator;Sum=sum+item;Flag=-flag;Denominator=denominator+2;}Printf(“sum=%f\n”, sum); Return 0;}统计学生的成绩从键盘输入一批学生的成绩，计算平均成绩，并统计不及格学生的人数统计一个整数的位数判断素数求最小值及其下标判断回文统计数字字符个数输入5个字符串，输出其中最小字符串将数组元素逆序存放输入n个学生的成绩信息，计算并输出每个学生的个人平均成绩。