为什么这么写
int i=0；
while(i<10)
{
i++
prinft("第％d遍书写：computer\n",i)；
i++不是先赋值再运算吗，那第一次运算后的结果难道是：第０遍书写computer?第０遍怎么感觉怪怪的？此时i=1对吧
qq_慕前端7280996
2021-07-11
6 回答
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#include <stdio.h>
int main()
{
int i,sum=0;
i=1;
while(i<=100) //循环条件应该是什么呢？
{
sum=sum+i;
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;
}
首先，你的循环条件写错了，应为while(i<=100)说明i的值仅在100以内取，接下来是循环体，当i满足循环调节就会执行sum=i+sum的式子，执行完后会有i++(注意：i++只能放在那个式子后面，代表执行完式子之后执行i++),因为int i=1 int sum=0,那么第一次循环就是sum=1+0=1,然后i++使i自增1，即为2，使第二次循环中的i值就为第一次循环结束的i++的值，为2，且第二次循环的sum值为第一次循环结束后的sum值，即为1，那么第二次循环的结果是sum,1+2，然后后面的循环如上，就形成了1+2+3+...+100的结果，为5050
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