为什么结果是onetwothree40 50 0而不是onetwothreethis结束... 40 50 0？ [英] Why the result is onetwothree40 50 0 and not onetwothreethis is the end...40 50 0 ?

问题描述

#include <stdio.h>

int main()
{
    int i=10,j=20,k=0;
    
    if(i=40)
      
      printf("One");
    if(j=50)
      
      printf("Two");
    if(k=60)
      
      printf("Three");
    if(k=0)
      
      printf("This is the end...");
    printf("%d %d %d\n",i,j,k);
}

我的尝试：



为什么结果是onetwothree40 50 0而不是onetwothreethis是结束... 40 50 0 ??

What I have tried:

Why the result is onetwothree40 50 0 and not onetwothreethis is the end...40 50 0 ??

推荐答案

那是因为 = 是一个赋值运算符。

你需要使用 == 进行比较。

尝试 -

That's because = is an assignment operator.
You need to use == for comparision.
Try-

int main()
{
    int i=10,j=20,k=0;
    
    if(i==40)
      
      printf("One");
    if(j==50)
      
      printf("Two");
    if(k==60)
      
      printf("Three");
    if(k==0)      
      printf("This is the end...");

    printf("%d %d %d\n",i,j,k);
}

希望，它有帮助：）

Hope, it helps :)

正如 Suvendu Shekhar Giri ，您正在使用赋值运算符而不是相等的测试。现在在 C 编程语言中，构造

As suggested by Suvendu Shekhar Giri, you are using the assignment operator instead of the test for equality. Now in C programming language, the construct

i=40

是一个表达式，其评估值为 40 。所以写了

is an expression, whoose evaluation is 40. So writing

if (i=40)

结束于

ends up in

if (40)

这是 中的条件（任何数字，但 0 假定为 true ）



这就是你得到这种意外输出的原因。

That is a true condition in the if (any number but 0 is assumed to be true)

That's the reason you're getting such unexpected output.

Quote：

为什么结果是onetwothree40 50 0而不是onetwothreethis是结束... 40 50 0？

Why the result is onetwothree40 50 0 and not onetwothreethis is the end...40 50 0 ?

因为在C中，任何整数都是 true 但是值0是 false 。

小心，同时在中确定一个值，如果条件合法，则通常是不需要的并且是新手的常见错误。



以下是语言作者对C和C ++参考书的链接。注意，C是C ++的祖先，所以知道C对C ++总是有用。

C编程语言 - 维基百科，免费的百科全书 [ ^ ]

https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2。 pdf [ ^ ]

http：//www.ime.usp。 br / ~pf / Kernighan-Ritchie / C-Programming-Ebook.pdf [ ^ ]



C ++编程语言 [ ^ ]

Because in C, any integer is true but the value 0 which is false.
Be careful, while assinging a value in a if condition is legal, it is often unwanted and a common error of newbies.

Here is links to references books on C and C++ by the authors of the languages. Note than C is the ancestor of C++, so knowing C is always useful with C++.
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

C++ Programing Language[^]

这篇关于为什么结果是onetwothree40 50 0而不是onetwothreethis结束... 40 50 0？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！