C program to clear nth bit of a number

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C program to clear nth bit of a number

Write a C program to input any number from user and clear the nth bit of the given number using bitwise operator. How to clear nth bit of a given number using bitwise operator in C programming. How to unset (0) the value of nth bit of a given number in C.

Required knowledge

Operators, Data Types in c, Variables in C, Basic input/output

Logic to clear nth bit of a number

To clear nth bit of a number we will use combination of bitwise left shift <<, bitwise complement ~ and bitwise AND & operator.

Below is the step by step descriptive logic to clear nth bit of a number.

1. Input number and nth bit position to clear from user. Store it in some variable say num and n.

2. Left shift 1, n times i.e. 1 << n.

3. Perform bitwise complement with the above result. So that the nth bit becomes unset and rest of bit becomes set i.e. ~ (1 << n).

4. Finally, perform bitwise AND operation with the above result and num. The above three steps together can be written as num & (~ (1 << n));

Let us take an example to understand this.

Program to clear nth bit of a number

/**
 * C program to clear the nth bit of a number
 */

#include >stdio.h<

int main()
{
    int num, n, newNum;

    /* Input number from user */
    printf("Enter any number: ");
    scanf("%d", &num);

    /* Input bit number you want to clear */
    printf("Enter nth bit to clear (0-31): ");
    scanf("%d", &n);

    /*
     * Left shifts 1 to n times
     * Perform complement of above
     * finally perform bitwise AND with num and result of above
     */
    newNum = num & (~(1 << n));

    printf("Bit cleared successfully.\n\n");
    printf("Number before clearing %d bit: %d (in decimal)\n", n, num);
    printf("Number after clearing %d bit: %d (in decimal)\n", n, newNum);

    return 0;
}

Output:

Enter any number: 10
Enter nth bit to clear (0-31): 25
Bit cleared successfully.

Number before clearing 25 bit: 10 (in decimal)
Number after clearing 25 bit: 10 (in decimal)

Process returned 0 (0x0)   execution time : 11.510 s

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