do...while循环
1.1、do...while循环语法
do {statement...} while (condition)
1.2、示例
sum = 0; i = 0; do {sum += i; i++} while (i <= 100) printf("sum = %d, i = %d\n", sum, i)
sum = 0;
i = 0;
do {
    sum += i;
    i++
} while (i <= 100)
printf("sum = %d, i = %d\n", sum, i)