cannot execute program

[God_125]

VC6.0
XP SP3

#include <stdio.h>


main()

{

int a,b,s;
a=3;
b=2;
s=s+25 * b * b-4;

printf("the answer of a+25 * b * b * b-4 is:%d\n",s);

}
一个很简单的程序都不行 也不提示错误 也没有警告 好像编译通过 运行了就"cannot execute program"这样
请高人指点

[huangkaigoodup]

这样就行啦
#include <stdio.h>
void main()
{
int a,b,s;
a=3;
b=2;
s=a+25 * b * b-4;
printf("the answer of a+25 * b * b * b-4 is:%d\n",s);
}