By | 27.12.2016

# Binary Number to Decimal using functions

Write a C++ Program to Convert Binary Number to Decimal using functions. Here’s simple C++ Program to Convert Binary Number to Decimal using functions in C++ Programming Language.

## What are Functions ?

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.

## Defining a Function : :

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )
{
//function’s body
}

• return_type : suggests what the function will return. It can be void, int, char, some pointer or even a class object.
• Function_Name : is the name of the function, using the function name it is called.
• Parameters : are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.
• Function body : is he part where the code statements are written.

Below is the source code for C++ Program to Convert Binary Number to Decimal using functions which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/*  C++ Program to Convert Binary Number to Decimal using functions  */

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

int convertBinaryToDecimal(long long);

int main()
{
long long n;

cout << "\nEnter any binary number :: ";
cin >> n;

cout <<"\n [ " << n << " ] in binary = [ " << convertBinaryToDecimal(n) << " ] in decimal"<< endl ;
return 0;
}

int convertBinaryToDecimal(long long n)
{
int decimalNumber = 0, i = 0, remainder;
while (n!=0)
{
remainder = n%10;
n /= 10;
decimalNumber += remainder*pow(2,i);
++i;
}
return decimalNumber;
}```

### OUTPUT : :

```/*  C++ Program to Convert Binary Number to Decimal using functions  */

Enter any binary number :: 111111

[ 111111 ] in binary = [ 63 ] in decimal

Process returned 0```

Above is the source code for C++ Program to Convert Binary Number to Decimal using functions which is successfully compiled and run on Windows System.The Output of the program is shown above .

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Category: C++ Programming Functions Programs Tags: My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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