#include <stdio.h>
int main()
{
int i,sum=0;
i=1;
while( i<=100 ) //循环条件应该是什么呢?
{
i++;
sum=sum+i;
//这里是不是应该改变循环变量的值
}
printf("100以内所有整数之和为:%d\n", sum);
return 0;
}
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你把i++放在sum上面之后,程序是这样运行的:
(第一次):i++就是i+1=2 然后i=2代入sum=sum+i中,即sum=0+2
(第二次):i++就是i+1=3 然后i=3代入sum=sum+i中,即sum=2+3
但是实际上程序是这样运行才对的
(第一次):i=1先代入sum=sum+i中,即sum=0+1,然后i++即i=2
(第二次):i=2先代入sum=sum+i中,即sum=1+2,然后i++即i=3.
这里是一个循环体,也就是说循环100次,每次都比正确的多加了数