三元运算符c ++中的return语句 [英] return statement in ternary operator c++

问题描述

我用三元运算符写了绝对函数如下

I wrote the absolute function using ternary operator as follows

int abs(int a) {
 a >=0 ? return a : return -a;
}

我收到以下错误消息

../src/templates.cpp: In function ‘int abs(int)’:
../src/templates.cpp:4: error: expected primary-expression before ‘return’
../src/templates.cpp:4: error: expected ‘:’ before ‘return’
../src/templates.cpp:4: error: expected primary-expression before ‘return’
../src/templates.cpp:4: error: expected ‘;’ before ‘return’
../src/templates.cpp:4: error: expected primary-expression before ‘:’ token
../src/templates.cpp:4: error: expected ‘;’ before ‘:’ token
../src/templates.cpp:5: warning: no return statement in function returning non-void

如果我这样写

return a>=0 ? a : -a;

我没有收到任何错误.两者有什么区别?

I don't get any error. What's the difference between the two?

推荐答案

三元运算符的第二个和第三个参数是表达式，而不是语句.

The second and third arguments to the ternary operator are expressions, not statements.

 return a

是一个陈述

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