如何比较一个字符? [英] How to compare a char?
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问题描述
我正在学习c.我有个问题.为什么我的程序不起作用?
I am learning c. I have a question. Why doesn't my program work?
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
char cmd;
void exec()
{
if (cmd == "e")
{
printf("%c", cmd);
// exit(0);
}
else
{
printf("Illegal Arg");
}
}
void input()
{
scanf("%c", &cmd);
exec();
}
int main()
{
input();
return 0;
}
我插入一个"e",但表示非法参数.
cmd不等于"e".为什么?我将带有scanf的cmd设置为"e".
I insert a "e" but it says illegal arg.
cmd is not equal to "e". Why? I set cmd with scanf to "e".
推荐答案
首先,在C中,单引号是char文字,而双引号是字符串文字.因此,"C"和"C"不是同一件事.
First of, in C single quotes are char literals, and double quotes are string literals. Thus, 'C' and "C" are not the same thing.
要进行字符串比较,请使用strcmp.
To do string comparisons, use strcmp.
const char* str = "abc";
if (strcmp ("abc", str) == 0) {
printf("strings match\n");
}
要进行字符比较,请使用等于运算符.
To do char comparisons, use the equality operator.
char c = 'a';
if ('a' == c) {
printf("characters match\n");
}
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