Use the if statement to specify a block of C++ code to be executed if a condition is true.
Syntax
if (condition) {
// block of code to be executed if the condition is true
}
// block of code to be executed if the condition is true
}
Note that if is in lowercase letters. Uppercase letters (If or IF) will generate an error.
In the example below, we test two values to find out if 20 is greater than 18. If the condition is true, print some text:
Example
if (20 > 18) {
cout << "20 is greater than 18";
}
cout << "20 is greater than 18";
}
We can also test variables:
Example
int x = 20;
int y = 18;
if (x > y) {
cout << "x is greater than y";
}
int y = 18;
if (x > y) {
cout << "x is greater than y";
}
Example explained
In the example above we use two variables, x and y, to test whether x is greater than y (using the > operator). As x is 20, and y is 18, and we know that 20 is greater than 18, we print to the screen that "x is greater than y".
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