程序代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
int a, b = 0;
for (a = 10; a<20; a+=1) {
   

if (a/15 == 0) {
switch (a%4) {
case 0:
b += 1;
break;
case 1:
b += 2;
break;
}
}
}
printf("a=%d b=%d",a, b);
     system("pause");
      return 0;
}