C语言编程题目

1、1、 编程实现：从键盘输入3个变量的值，其中中a=5，b=6,c=7，然后将3个变量的值进行交换，使得a=6,b=7,c=5.#includestdio.hvoid main()int a,b,c,m;printf(Enter a,b,c:);scanf(%d,%d,%d,&a,&b&c);m=a;a=b;b=c;c=m;printf(a=%d,b=%d,c=%dn,a,b,c);2、 编程实现：输入任意一个3位数，将其各位数字反序输出（例如：输入123，输出321）。#includestdio.hvoid main()int a,b,c,x,y;printf(输入一个3位数：n);scanf

2、(%d,&x);a=x%10;b=x/100;c=x%100/10;y=a*100+c*10+b;printf(%dn,y);3、 编程实现：输入三角形的边长，求三角形面积（面积=sqrt(s(s-a)(s-b)(s-c），s=(a+b+c)/2.#include#includevoid main()int a,b,c;float x,y;scanf(%d,%d,%d,&a,&b,&c);x=(a+b+c)/2;y=sqrt(s*(s-a)*(s-b)*(s-c);printf(%.3fn,y);4、 编程实现：从键盘上输入一个年月日，要求出该天是该年的第几天（注意判断该年是否是闰年）。#in

3、cludevoid main()inta,b,c;printf(输入一个年月日：);scanf(%d%d%d,&a,&b,&c);if(a%4=0|a%100=0)switch(b)case 1: printf(%dn,c);break;case 2: printf(%dn,31+c);break;case 3: printf(%dn,60+c);break;case 4:printf(%dn,91+c);break;case 5:printf(%dn,121+c);break;case 6:printf(%dn,152+c);break;case 7:printf(%dn,182+c);br

4、eak;case 8:printf(%dn,213+c);break;case 9: printf(%dn,244+c);break;case 10: printf(%dn,274+c);break;case 11: printf(%dn,305+c);break;case 12: printf(%dn,335+c);break;elseswitch(b)case 1: printf(%dn,c);break;case 2: printf(%dn,31+c);break;case 3: printf(%dn,59+c);break;case 4: printf(%dn,90+c);break;

5、case 5: printf(%dn,120c);break;case 6: printf(%dn,151+c);break;case 7: printf(%dn,181+c);break;case 8: printf(%dn,212+c);break;case 9: printf(%dn,243+c);break;case 10: printf(%dn,273+c);break;case 11: printf(%dn,304+c);break;case 12: printf(%dn,334+c);break;5、 求n!(1!+2!+3!+.+25!)。（n从1到25）#includevoi

6、d main()float sum=1,term=0;for(i=1;i=25;i+)sum=sum*i;term=term+sum;printf(%d,%fn,i,term);6、 编写一个判断素数的函数，在主函数输入一个整数，输出是否是素数的信息。#includeint f(int,a);void main()int a,y;scanf(%d,&a);if(a2)printf(输入有误：);elseif(a=2)printf(a为素数：);elsey=f(a);if(y=1)printf(a为素数：);elseprintf(a不为素数：);7、 键盘输入10个整数，用冒泡排序法按从小到大的顺序输出。#includevoid main()int i,m,a10;for(i=0;i10;i+)scanf(%d,&ai);for(i=0;iai+1)m=ai;ai=ai+1;a