C语言-while语句和dowhile语句

#include <stdio.h>

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

    return 0;
}

#include <stdio.h>

int main()
{
    int count =0;
    printf ("请输入一行英文字符:\n");
    while (getchar() != '\n')
    {
        count = count + 1;
    }
    printf ("你总共输入了%d个字符！\n",count);
    return 0;
}

do.....while语句

do 

    循环体
while (表达式)；