我的第一个VC小程序,破处！

#include <windows.h>
#include<stdio.h>
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
    int num,sum=0;
char sput[20];
    for(num=1;num<=100;num++)
{
sum=sum+num;
}
    sprintf(sput,"the sum is %i",sum);
MessageBox(NULL,sput,"add to 100",0);
    return 0;
}