MakeFile in C++ and its applications
Last Updated :
23 Apr, 2024
Given a C++ program, 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/function and its functionalities and later link them all through a Makefile command available in C++.
Advantages:
- It makes codes more concise and clear to read and debug.
- No need to compile an entire program every time whenever you make a change to a functionality or a class. Makefile will automatically compile only those files where change has occurred.
- Generally, in long codes or projects, Makefile is widely used in order to present projects in more systematic and efficient way.
Example: Create a program to find the factorial and multiplication of numbers and print it.
Traditional WayÂ
CPP
// 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;
}
Use Makefile to run the above program:
CPP
#include <bits/stdc++.h>
// Note function.h which has all functions
// definitions has been included
#include "function.h"
using namespace std;
// Main program
int main()
{
int num1 = 1;
int num2 = 2;
cout << multiply(num1, num2) << endl;
int num3 = 5;
cout << factorial(num3) << endl;
print();
}
CPP
#include <bits/stdc++.h>
// Definition of print function is
// present in function.h file
#include "function.h"
using namespace std;
void print() { cout < "makefile" << endl; }
- File Name: factorial.cppÂ
CPP
#include <bits/stdc++.h>
// Definition of factorial function
// is present in function.h file
#include "function.h"
using namespace std;
// Recursive factorial program
int factorial(int n)
{
if (n == 1)
return 1;
return n * factorial(n - 1);
}
CPP
#include <bits/stdc++.h>
// Definition of multiply function
// is present in function.h file
#include "function.h"
using namespace std;
int multiply(int a, int b) { return a * b; }
CPP
#ifndef FUNCTION_H
#define FUNCTION_H
void print();
int factorial(int);
int multiply(int, int);
#endif
Commands to Compile and Run the 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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