c - while 循环无法检测简单的数学运算

Question

我试图了解 while 循环的工作原理以及如何使用它们，因此我尝试创建一个循环，其中代码从名为 health 的变量中删除 50 个点，直到变量 = 0，但由于某种原因它无法检测到删除点数的操作，因此它只会继续打印“玩家有 100 生命值”。

#include <stdio.h>
#include <stdlib.h>

int main()
{
    /*this is me just messing around and learning*/;
    int health=100;
    while (health>0)
        printf("player has %d HP\n",health);
    health=health-50;
    printf("player took -50 damage ");
    printf("player has %d HP\n",health);
    if(health<20)
        (printf("low on health?"));
    else
        printf("that will leave a mark");
    return 0;
}

Answer 1

您需要使用大括号来确定属于 while 循环的代码范围。您可能打算这样做:

while (health > 0) {
    printf("player has %d HP\n", health);
    health = health - 50;
    printf("player took -50 damage ");
    printf("player has %d HP\n", health);
    if (health < 20) (printf("low on health?"));
    else printf("that will leave a mark");
}

您当前的代码，就目前而言，将无限循环，打印 player has 100 health，因为 while 循环的主体只是默认 printf 语句紧邻下一行。