for循环

```#inclide <stdio.h>main(){       int i,n=100,sum=0;       printf("input n:");       scanf("%d",&n);       for(i=1;i<=n;i++)       sum+=i;  printf("sum=%d\n",sum);return 0;}```![这里写图片描述](http://img.blog.csdn.net/20171110214150986?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdGFuZzA1MTMwOA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)要点：1、for语句格式为“（；；）”