C code to subtract two integer using Bitwise operator

C code to subtract two integer using Bitwise operator

In this article, we will discuss the concept of the C code to subtract two integer using Bitwise operator

In this post, we are going to learn how to  write a program to find the subtraction of two numbers using Bitwise operator in C programming language

Code to find the subtraction of  two numbers 

Subtract two integer using Bitwise operator

The program allow the user to enter two integers and then calculates subtraction of given  numbers using  Bitwise operator in C language

Program 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a,b,num1,num2;//variable declaration

    printf("Enter the first number: \n");
    scanf("%d",&num1);
//Ask input from the user and store the input in variable num1;
     printf("Enter the second number: \n");
    scanf("%d",&num2);
//Ask input from the user and store the input in variable num2;
    a=num1;
//Assign the value of num1 to a
    b=num2;
//Assign the value of num2 to b

    while (num2!= 0)//using while loop to calculate subtraction  
    {
        int bwr=(~num1) & num2;
        num1=num1^num2;
        num2=bwr<<1;
    }
    printf("Subtraction of %d and %d is %d",a,b,num1);
//display result on the screen
getch();
    return 0;
}

When the above code is executed, it produces the following result

Case 1

Enter first number: 100
Enter second number: 55
Subtraction of two numbers 100 and 55 is: 45

Case 2

Enter first number: 55
Enter second number: 100
Subtraction of two numbers 55 and 100 is: -45

Subtract two integer using Bitwise operator – using function

The program allow the user to enter two integers and then calculates subtraction of given  numbers using  Bitwise operator in C language

Program 2

#include <stdio.h>
#include <stdlib.h>
int sub(int,int);
int main()
{
int num1,num2,ans;
printf("Enter the first number ");
//ask input from the user
scanf("%d",&num1);
//store the input number in num1
printf("Enter the second number ");
//ask input from the user
scanf("%d",&num2);
//store the input number in num1
ans=sub(num1,num2);//Calling the function
printf("Subtraction of %d and %d is: %d",num1,num2,ans);
getch();
return 0;
}
int sub(int x, int y){//function definition
while(y!=0){
int carry=(~x) & y;
x=x^y;
y=carry<<1;
}
return x;
}

When the above code is executed, it produces the following result

Case 1

Enter first number: 500
Enter second number: 230
Subtraction of two numbers 500 and 230 is: 270

Case 2

Enter first number: 200
Enter second number: 340
Subtraction of two numbers 50 and 23 is: -140

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