c语言程序设计习题答案

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1、1到100之间的奇数之和与偶数之和#include#includevoidmain(void){intx;intu=0,s=0;printf("1到100之间的奇数之和为：");for(x=1;x<=99;x+=2)s+=x;printf("%d",s);printf("1到100之间的偶数之和为：");for(x=0;x<=100;x+=2)u+=x;printf("%d",u);getch();}某门课程的平均成绩#include#includevoidmain(void){

2、inti,x,sum=0;inta=0,b=0,c=0,d=0,f=0;intave;for(i=1;i<=10;i++){printf("请输入第%d个学生的成绩",i);scanf("%d",&x);sum+=x;switch(x/10){case9:a++;break;case8:b++;break;case7:c++;break;case6:d++;break;default:f++;}}ave=sum/10;printf("这10个学生的平均成绩为:%d其中在90-100之间的有:%d80-90之间的有%d70-80之间的有:%d6

3、0-70之间的有:%d不及格的有:%d",ave,a,b,c,d,f);getch();}Howareyou！#include#includevoidmain(void){intt;for(t=1;t<=15;t++)printf("*");printf("");printf("howareyou!");getch();}Helloworld！#include#includevoidmain(void){intt;for(t=1;t<=15;t++)printf("*");print

4、f("");printf("howareyou!");getch();}爱因斯坦数学题#include#includevoidmain(void){inti=1;while(!((i%2==1)&&(i%3==2)&&(i%5==4)&&(i%6==5)&&(i%7==0)))i++;printf("阶梯共有%d阶",i);getch();}不引入中间变量交换两数的值#include#includevoidmain(void){inta,b;printf("请输入两个数：");sca

5、nf("%d%d",&a,&b);a=a+b;b=a-b;a=a-b;printf("结果为：%d%d",a,b);getch();}猜数字游戏#include#include#include#includevoidmain(void){intdate,guess;srand((unsigned)time(NULL));date=rand()%5+1;printf("请输入要猜的数字（1~5）:");scanf("%d",&guess);if(guess==date)printf("猜对

6、了！正确数字是：%d",date);elseprintf("猜错了！正确数字是：%d",date);getch();}超市商品信息管理系统#include#include#include#includevoidmain(void){unsignedinti;char*s1="超市管理系统";char*s2="1.录入商品信息";char*s3="2.更新商品信息";char*s4="3.商品信息查询";char*s5="4.商品信息统计";char*s6="5.商品销售排行";char*

7、s7="6.退出系统";for(i=1;i<=(80-strlen(s1))/2;i++)printf("");printf("%s",s1);for(i=1;i<=(80-strlen(s2))/2;i++)printf("");printf("%s",s2);for(i=1;i<=(80-strlen(s3))/2;i++)printf("");printf("%s",s3);for(i=1;i<=(80-strlen(s4))/2;i++)printf("");printf("%s",s4);for(i=1;i<=(80

8、-strlen(s5))