C Programming Code Examples
C > Bitwise Operators Code Examples
C program to clear nth bit of a number
/* 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.
To clear nth bit of a number we will use combination of bitwise left shift <<, bitwise complement ~ and bitwise AND & operator.
Input number and nth bit position to clear from user. Store it in some variable say j and n.
Left shift 1, n times i.e. 1 << n.
Perform bitwise complement with the above result. So that the nth bit becomes unset and rest of bit becomes set i.e. ~ (1 << n).
Finally, perform bitwise AND operation with the above result and j. The above three steps together can be written as j & (~ (1 << n)); */
#include <stdio.h>
int main()
{
int j, n, newj;
/* Input number from user */
printf("Enter any number: ");
scanf("%d", &j);
/* 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 j and result of above
*/
newj = j & (~(1 << n));
printf("Bit cleared successfully.\n\n");
printf("Number before clearing %d bit: %d (in decimal)\n", n, j);
printf("Number after clearing %d bit: %d (in decimal)\n", n, newj);
return 0;
}
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