C Program to Multiply Number by 4 using Bitwise Operators

This is a C Program to multiply given number by 4 using bitwise operators.

This C Program multiplies given number by 4 using bitwise operators.

The bitwise operators are or, and, xor, not, left shift, right shift. Program uses left shift operator for this.

Here is source code of the C program to multiply given number by 4 using bitwise operators. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/*
 * C program to multiply given number by 4 using bitwise operators
 */
#include <stdio.h>
 
void main()
{
    long number, tempnum;
 
    printf("Enter an integer \n");
    scanf("%ld", &number);
    tempnum = number;
    /*  left shift by two bits */
    number = number << 2;
    printf("%ld x 4 = %ld\n", tempnum, number);
}

In this C program, we are reading the integer using ‘number’ variable, and assign the value of ‘number’ variable to ‘tempnum’ variable. The bitwise operators are, or, and, xor, not, left shift, right shift. The program uses left shift operator to the value of ‘number’ variable by two bits.

 
$ cc pgm62.c
$ a.out
Enter an integer
450
450 x 4 = 1800

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