求1+2+3+......+100.

1.while语句编写：

#include <stdio.h>int main(){int i=1,sum=0;while(i<=100)    {      sum=sum+i; i=i++;  //此处不能写成i=i++;??,但写成i=i+1是对的 }printf("sum=%d\n",sum);return 0;}//kb117

2.do while 语句编写

#include <stdio.h>int main(){int i=1,sum=0;    do    {    sum=sum+i;    i++;}while(i<=100);printf("sum=%d\n",sum);return 0;}//kb117