1. do...while循环:

#include <stdio.h>

int main()
{
    int i = 1;
    int sum = 0;
    do{
        sum+=i;
        i++;
    }while(i<=100);
    printf("%d\n",sum);
}

 2. while循环:

#include <stdio.h>

int main()
{
    int i = 1;
    int sum = 0;
    while(i<=100)
    {
        sum+=i;
        i++;
    }
    printf("%d\n",sum);
}

 3.for循环:

#include <stdio.h>

int main()
{
    int i,sum;
    for(i = 1,sum = 0; i<=100; i++)
    {
        sum+=i;
    }
    printf("%d\n",sum);
}

例子输出结果:

C语言三种循环方式实现1-100的和计算

 

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