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2025-03-05 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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本篇内容主要讲解"C语言中如何实现判断",感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习"C语言中如何实现判断"吧!
(一)
先动手编写一个程序:
#include int main(){ if(1) { printf("The condition is true!\n"); } return 0;}
运行结果:
The condition is true!
再把1依次改为,2,5,100,-10,发现运行结果完全一样。
再改成if(0),此时发现没有运行结果,说明printf()语句没被执行。
C语言把判断语句中的任何非0或非空的值当作真。所以if(1), if(2), if(5), if(100), if(-10)的效果是一样的。
(二)
再编写一个程序:
#include int main(){ int a = 100; if(a > 0) { printf("The condition value is %d\n", (a > 0)); } return 0;}
运行结果:
The condition value is 1
分析:
a = 100,a > 0成立 ,所以if( a > 0)等价于if(1)。
在C语言中,判断语句是有值的,要么为1,要么为0。比如本程序中a > 0的值就是1。
(三)
最后编写一个程序:
#include int main(){ char c1 = '\0'; if(c1) { printf("The condition is true!\n"); } else { printf("The condition is false!\n"); } char c2 = ' '; if(c2) { printf("The condition is true!\n"); } else { printf("The condition is false!\n"); } char c3 = 'A'; if(c3) { printf("The condition is true!\n"); } else { printf("The condition is false!\n"); } return 0;}
运行结果:
The condition is false!The condition is true!The condition is true!
说明:C语言中用'\0'来表示空字符。空格' '也是一个字符,这从if(c2)条件为真就可以看出来。
到此,相信大家对"C语言中如何实现判断"有了更深的了解,不妨来实际操作一番吧!这里是网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!
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