#include?<stdio.h>
int?main()
{
????//?定義變量sum,?num
????int?sum,?num;??
????sum?=?0;
????for(num=0?;?num<=10?;?num++??????)；?
//for循環(huán)條件與num的變化值
????{
?????????sum?+=?num;???//計算每次數(shù)字之間的和sum
????}
????printf("10以內(nèi)數(shù)的和為：%d",?sum);
????return?0;
}

就是for后面加了個；運算結(jié)果就會變成11