循环 while   do---while

1 计算1+2+3...+99+100的和.

a---   int sum = 0,i = 0;

while (i < 101) {

sum = sum + i;

i++;

}

printf("%d",sum);

b--

int sum = 0,i = 1;//存储值

do {

sum = sum + i;//现执行一次循环体,在判断条件

i++;

} while (i < 101);

printf("%d",sum);

2

//100以内13倍数之和

int sum = 0,i  = 1;

while (i < 101) {

if (i % 13 == 0) {//对13取余

printf("%d",i);

sum = sum + i;

}

i++;

}

printf("\n%d",sum);

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