MakeFile in C++ and its applications

Given a C++ program and the task is to break the entire program in the form of Makefile.
It is basically used to create .cpp file and .h file for each class/functions and its functionalities and later link them all through a Makefile command available in C++.

Advantages:

Example: Create a program to find the factorial and multiplication of numbers and print it.

Traditional Way

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// Program to calculate factorial and
// multiplication of two numbers.
#include<bits/stdc++.h>
using namespace std;
  
// Function to find factorial
int factorial(int n)
{
    if (n == 1)
        return 1;
    // Recursive Function to find 
    // factorial
    return n * factorial(n - 1);
}
  
// Function to multiply two numbers
int multiply(int a, int b)
{
    return a * b;
}
  
// Function to print
void print()
{
    cout << "makefile" << endl;
}
  
// Driver code
int main()
{
    int a = 1;
    int b = 2;
    cout << multiply(a, b) << endl;
    int fact = 5;
    cout << factorial(5) << endl;
    print();
    return 0;
}
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Output:



2
120
makefile

Use Makefile to run the above program:

Commands to Compile and Run above program:

Open Terminal and type commands:
g++ -c main.cpp
g++ -c print.cpp
g++ -c factorial.cpp
g++ -c multiply.cpp
g++ -o main main.o print.o factorial.o multiply.o
./main

Note: g++ -c filename.cpp is used to create object file.

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