排序3个人的年龄 [英] Sort the age of 3 individuals

问题描述

/* to find the age of individuals according to youngest to oldest */

#include <stdio.h>

int main(void)
{
  int age1, age2, age3, youngest, middle, oldest;
  {
    printf ("Enter the age of the first individual: ");
    scanf  ("%d", &age1);
    printf ("Enter the age of the second individual: ");
    scanf  ("%d", &age2);
    printf ("Enter the age of the third individual: ");
    scanf  ("%d", &age3);
  }
  if (age1==age2==age3);
  {
    printf("All individuals have the same age of %d", &age1);
  }
  else
  {
    youngest = age1;

    if (age1 > age2)
      youngest = age2;
    if (age2 > age3)
      youngest = age3;

    middle = age1;

    if (age1 > age2)
      middle = age2;
    if (age2 < age3)
      middle = age2;

    oldest = age1;

    if (age1 < age2)
      oldest = age2;
    if (age2 < age3)
      oldest = age3;

    printf("%d is the youngest.\n", youngest);
    printf("%d is the middle.\n", middle);
    printf("%d is the oldest.\n", oldest);
  }
  return 0;
}

我一直在第21行收到错误，声明我有'其他' '用之前的'if'。这里的任何专家都可以告诉我哪里出错了？如果我要删除'else'，显示也有点奇怪。

I keep getting the error on line 21 which states that I have an 'else' with a previous 'if'. Any of the experts here can tell me where I went wrong? The display is also a little weird if I were to remove the 'else'.

推荐答案

在你的代码中

 if (age1==age2==age3);

严重受损。

两个主要分数，

• 像 age1 == age2 == age3 这样的表达式要么

• 0 == age3 ，当 age1时！= age2


• 1 == age3 ，当 age1 == age2

• 0 == age3 , when age1 != age2
• 1 == age3 , when age1 == age2

这些都不是你想要的。

; 在结尾处，如果语句使下一个块无条件。

The ; at the end of the if statement makes the next block unconditional.

充其量，您可以重写

 if ( ( age1 == age2 ) && ( age2 == age3) ) { .... }

---

之后，如果

---

After that, in case of

  printf("All individuals have the same age of %d", &age1);

您无需传递地址 - 变量。事实上，这使得语句非常错误，将不兼容的参数类型传递给提供的转换说明符，这会导致 undefined行为。

you don't need to pass the address-of the variable. This, in fact makes the statement very wrong, passing an incompatible type of argument to a supplied conversion specifier, which causes undefined behavior.

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