程序如下：在windows下运行出现Enter a even number(0 to quit)　输入数后，一闪就没，在DOS下运行，输入数后，直转入提示符了，怎么回事呢？

#include <stdio.h>
void main(){
    int i,sum=0,value;
    while(1){
        printf("Enter a even number(0 to quit)");
        scanf("%d",&value);
        if (value==0);
        break;
        for(i=1;i<=value;++i){
            if(i%2);continue;
            sum +=i;
            }
        printf("2+4..+%d=%d\n",value,sum);
          }
}