In this tutorial, you shall learn about Less-than Relational Operator in C++ programming language, its syntax, and how to use this operator with the help of examples.

## C++ Less than Operator

In C++, Less-than Relational Operator is used to check if left operand is less than the second operand.

The syntax to check if `x` is less than `y` using Less-than Operator is

`x < y`

The operator returns a boolean value of `true` if `x` is less than `y`, or `false` if not.

## Examples

### 1. Check if number in x is less than that of in y

In the following example, we take two integer values in `x` and `y`, and check if the value in `x` is less than that of `y`, using Less-than Operator.

main.cpp

```#include <iostream>
using namespace std;

int main() {
int x = 1;
int y = 5;

if (x < y) {
cout << "x is less than y." << endl;
} else {
cout << "x is not less than y." << endl;
}
}```

Output

```x is less than y.
Program ended with exit code: 0```

Since value in `x` is less than that of in `y`, `x < y` returned true.

### 2. Check if string in x is less than that of in y

Now, let us take two strings, and check if one string is less than other. By default, strings are compared lexicographically, meaning, whichever the string comes first in a dictionary, that string is lesser.

main.cpp

```#include <iostream>
using namespace std;

int main() {
string x = "mango";
string y = "banana";

if (x < y) {
cout << "x is less than y." << endl;
} else {
cout << "x is not less than y." << endl;
}
}```

Output

```x is not less than y.
Program ended with exit code: 0```

Since value in `x` is not less than that of in `y`, `x < y` returned false.

## Conclusion

In this C++ Tutorial, we learned about Less-than Operator in C++, with examples.