How to use question mark expression in C language

In C language, the question mark expression is usually used with the conditional operator ?:, also known as the ternary operator. The syntax of question mark expression is "condition ? expression1 : expression2".

In C language, the question mark expression is usually used in the conditional operator ?:, also known as the ternary operator. This operator takes three operands and returns one of the two operands based on the result of the conditional expression preceding the middle question mark.

The syntax of the question mark expression is as follows:

c

condition ? expression1 : expression2

If condition is true (non-zero), the question mark expression returns the value of expression1; otherwise, returns the value of expression2 .

Here is a simple example that demonstrates how to use the question mark expression:

c

#include <stdio.h>  
  
int main() {  
    int a = 10;  
    int b = 20;  
    int max = (a > b) ? a : b;  
    printf("max = %d\n", max); // 输出 max = 20  
    return 0;  
}

In the above example, we use the question mark expression to determine the value of the variable max . If a is greater than b, then the value of max is a; otherwise, the value of max is b. In this case, because the value of b is greater than a, the output is max = 20.

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