Function overloading in Cpp

In C++, two functions can have the same name if the number and/or type of arguments passed are different. These functions have the same name but other arguments are known as overloaded functions. For example:
 

// same name different arguments
int test() { }
int test(int a) { }
float test(double a) { }
int test(int a, double b) { }

Here, all 4 functions are overloaded functions.
Notice that the return types of all these 4 functions are not the same. Overloaded functions may or may not have different return types but they must have different arguments. For example,
 

// Error code
int test(int a) { }
double test(int b){ }



Here, both functions have the same name, the same type, and the same number of arguments. Hence, the compiler will throw an error.

/ Program to compute absolute value
// Works for both int and float

#include <iostream>
using namespace std;

// function with float type parameter
float absolute(float var){
    if (var < 0.0)
        var = -var;
    return var;
}

// function with int type parameter
int absolute(int var) {
     if (var < 0)
         var = -var;
    return var;
}

int main() {
    
    // call function with int type parameter
    cout << "Absolute value of -5 = " << absolute(-5) << endl;

    // call function with float type parameter
    cout << "Absolute value of 5.5 = " << absolute(5.5f) << endl;
    return 0;
}


Read this for more details: https://www.programiz.com/cpp-programming/function-overloading