# C++ Relational Operators

The C++ relational operators used to compare two numbers and check which one is larger or smaller than the other. The result is a boolean value – true or false.

There are four relational operators listed here.

The relational operators are used in a C++ program where you want to check for some condition before executing a block of statement such as if-else or switch or a loop. More about branching, loops in future lessons.

The syntax for an expression with relational operator is:

(expression1) relational operator (expression2)

You can replace the expression with a constant, variable or anything comparable and the result will be either true or a false.

## Example Program: Relational Operator

The following program demonstrate the use of a relational operator. The program requests four input numbers and then find the greatest number of all and prints the result to the console.

#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
int a,b,c,d;

cout << "Enter value for a:";
cin >> a;

cout << "Enter value for b:";
cin >> b;

cout << "Enter value for c:";
cin >> c;

cout << "Enter value for d:";
cin >> d;

if(a >= b)
{
if(c >= a)
{
if(d >= c)
{
cout << "The greatest number is" << " " << d << endl;
}
else
{
cout << "The greatest number is" << " " << c << endl;
}
}
else
{
if(d >= a)
{
cout << "The greatest number is" << " " << d << endl;
}
else
{
cout << "The greatest number is" << " " << a << endl;
}
}
}
else
{
if(c >= b)
{
if(d >= c)
{
cout << "The greatest number is" << " " << d << endl;
}
else
{
cout << "The greatest number is" << " " << c << endl;
}
}
else
{
if(d >= b)
{
cout << "The greatest number is" << " " << d << endl;
}
else
{
cout << "The greatest number is" << " " << b << endl;
}
}
}
system("PAUSE");
return EXIT_SUCCESS;
}

### Output:

Enter value for a:45
Enter value for b:66
Enter value for c:70
Enter value for d:4
The greatest number is 70


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