c语言

99乘法表
#include <stdio.h>
main (){
int i,j,k;
for (i=1;i<10;i++){
for (j=1;j<=i;j++){
k=j*i;
printf ('%d*%d=%d\t',j,i,k);
}
printf ('\n');
}
system ('pause');
}




 #include <stdio.h>


int main()
{
int n;
while (scanf("%d",&n))
{
switch(n)
{
case 1: printf("星期一\n"); break;
case 2: printf("星期二\n"); break;
case 3: printf("星期三\n"); break;
case 4: printf("星期四\n"); break;
case 5: printf("星期五\n"); break;
case 6: printf("星期六\n"); break;
case 7: printf("星期日\n"); break;
default: break;
}
}
}






返回逆序数
＃include〈stdio.h〉
int main（）{
int n,m=0;
scanf（“%d”,&n）;
while（n!=0）{
m=m*10+n%10;
n=n/10;
}
printf("%d",m);
return 0;
}




＃include〈stdio.h〉
int main（）{
int n,m=0;
scanf（“%d”,&n）;
while（n!=0）{
m=m*10+n%10;
n=n/10;
}
printf("%d",m);
return 0;
}








计算器
#include <stdio.h>
int main()
{
char cp;
int a, b;
scanf("%d %c %d", &a, &cp, &b);
if (cp == '-')printf("%d", a - b);
else if(cp == '+')printf("%d", a + b);
else if (cp == '*')printf("%d", a * b);
else if (cp == '%')printf("%d", a % b);
return 0;
}