Q:

Clear all bits from MSB to the ith bit

YasminRadwan26
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2022-06-24
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Clear all bits from MSB to the ith bit

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YasminRadwan26
2022-06-24
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Here I have supposed data is stored using 8 bits.

let’s assume the ith position is 2.

mask =(1 <<( i+1)); // give you 00001000

so now if we subtract 1 from the mask (mask = mask – 1), then we will get 00000111

Using the mask, now we can clear MSB to ith bits of data (15).

data = data & mask; // Now bits are clear

#include <stdio.h>
int main()
{
    unsigned int mask = 0; // mask flag
    unsigned int i = 2; // ith position till u want to clear the bits
    unsigned int data = 15; //value of data
    mask = (1 << (i+1)); //Shift 1 ith position
    mask = mask -1 ; //give us 00000111
    //Now clear all bits from msb to ith position
    data  = data & mask;
    printf("data = %d\n", data);
    return 0;
}

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