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How do I use the conditional operator in C/C++?
This conditional operator is also known as the Ternary Operator. This operator has three phase.
Exp1 ? Exp2 : Exp3;
where Exp1, Exp2, and Exp3 are expressions. Notice the use and placement of the colon. The value of a ? expression is determined like this: Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression. If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.
The ? is called a ternary operator because it requires three operands and can be used to replace if-else statements, which have the following form
if(condition) {
var = X;
} else {
var = Y;
}For example, consider the following code
if(y < 10) {
var = 30;
} else {
var = 40;
}Above code can be rewritten like this
var = (y < 10) ? 30 : 40;
Example Code
#include <iostream>
using namespace std;
int main () {
// Local variable declaration:
int x, y = 10;
x = (y < 10) ? 30 : 40;
cout << "value of x: " << x << endl;
return 0;
}Output
value of x: 40
Updated on: 30-Jul-2019
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