C语言经典例题及答案.doc

作业一求一个任意边长的矩形面积。#include<stdio.h>voidmain(){intwhsum;scanf("%d%d"&w&h);sum=w*h;printf("area=%d\n"sum);}求一个任意半径的圆的面积及周长。#definePI3.14159#include<stdio.h>voidmain(){floatrareac;scanf("%f"&r);area=PI*r*r;c=2*PI*r;printf("area=%f\ncircle=%f\n"areac);}已知：w=5y=4z=2求表达式：w*y/z的值并输出。##include<stdio.h>voidmain(){intwyzr;w=5;y=4;z=2;r=w*y/z;printf("%5d"r);}作业二从键盘上输入三个数求出其中的最大值并输出。#include<stdio.h>voidmain(){intabcmax;scanf("%d%d%d"&a&b&c);max=a;if(max<b)max=b;if(max<c)max=c;printf("max=%d\n"max);}求sin300。+sin600+cos300+cos600之和。（注意：30*3.14159/180）#include<stdio.h>#definePI3.14159#include<math.h>voidmain(){floatabsum;a=30*PI/180;b=60*PI/180;sum=sin(a)+sin(b)+cos(a)+cos(60);printf("total=%f\n"sum);}比较两个数的大小。如果x大于y则输出：x>y否则输出：x<y。#include<stdio.h>voidmain(){intxy;scanf("%d%d"&x&y);if(x>y)printf("x>y\n");elseprintf("x<y\n");}作业三输入a、b、c三个值按从小到大排序输出。#include<stdio.h>voidmain(){intabct;scanf("%d%d%d"&a&b&c);if(a>b){t=b;b=a;a=t;}if(a>c){t=a;a=c;c=t;}if(b>c){t=b;b=c;c=t;}printf("%3d%3d%3d\n"abc);}.求自然数1～10之和。。#include<stdio.h>voidmain(){intisum;i=1;sum=0;while(i<=10){sum=sum+i;i++;}printf("sum=%d\n"sum);}输入10个整数统计出正数之和以及负数之和。（求奇数之和以及偶数之和）#include<stdio.h>voidmain(){intsum1=0sum2=0ix;i=1;while(i<=10){scanf("%d"&x);if(x%2==0)sum1=sum1+x;elsesum2=sum2+x;i++;}printf("sum1=%d\nsum2=%d\n"sum1sum2);}作业四输入一个0～6的整数转换成星期输出。#include<stdio.h>main(){inta;scanf("%d"&a);switch(a){case0:printf("Sunday");break;case1:printf("Monday");break;case2:printf("Tuesday");break;case3:printf("Wednesday");break;case4:printf("Thursday");break;case5:printf("Friday");break;case6:printf("saturday");break;default:printf("Iamsorry.Youarewrong.\n");}}.输入一个整数将各位数字反转后输出。如：输入365则输出显示为563。#include<stdio.h>voidmain(){intxr;scanf("%d"&x);printf("converis:");while(x!=0){r=x%10;printf("%d"r);x=x/10;}printf("\n");}输入一个整数求出它的所有因子。#include<stdi