本文介绍了为什么" A" !=" A"用C?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
void main() {
if("a" == "a")
printf("Yes, equal");
else
printf("No, not equal");
}
为什么输出不,不等于
?
推荐答案
什么您比较是针对不同的弦,其被存储在不同地点的两个存储器地址。这样做实际上是这样的:
What you are comparing are the two memory addresses for the different strings, which are stored in different locations. Doing so essentially looks like this:
if(0x00403064 == 0x002D316A) // Two memory locations
{
printf("Yes, equal");
}
使用以下code到两个字符串的值进行比较:
Use the following code to compare two string values:
#include <string.h>
...
if(strcmp("a", "a") == 0)
{
// Equal
}
此外,A==A
的确可能返回true,这取决于你的编译器,它可以在编译的时候合并等于字符串连接为一个以节省空间。
Additionally, "a" == "a"
may indeed return true, depending on your compiler, which may combine equal strings at compile time into one to save space.
当你比较两个字符值(不是指针),它是一个数字比较。例如:
When you're comparing two character values (which are not pointers), it is a numeric comparison. For example:
'a' == 'a' // always true
这篇关于为什么&QUOT; A&QUOT; !=&QUOT; A&QUOT;用C?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!