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C If ... Else 例子


真实世界例子

此例子展示了如何使用 if..else 来 "打开一扇门",如果用户输入了正确的代码

例子

int doorCode = 1337;

if (doorCode == 1337) {
  printf("正确代码。\n门现在打开了。");
} else {
  printf("错误代码。\n门仍然关闭。");
}
自己尝试 »

此例子展示了如何使用 if..else 来判断一个数字是正数还是负数

例子

int myNum = 10; // 这是一个正数还是负数?

if (myNum > 0) {
  printf("该值为正数。");
} else if (myNum < 0) {
  printf("该值为负数。");
} else {
  printf("该值为 0。");
}
自己尝试 »

判断一个人是否到了投票年龄

例子

int myAge = 25;
int votingAge = 18;

if (myAge >= votingAge) {
  printf("已经到了投票年龄!");
} else {
  printf("还没到投票年龄。");
}
自己尝试 »

判断一个数字是偶数还是奇数

例子

int myNum = 5;

if (myNum % 2 == 0) {
  printf("%d 是偶数。\n", myNum);
} else {
  printf("%d 是奇数。\n", myNum);
}
自己尝试 »


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