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115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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* C Program to Use Bitwise Operations to Count the Number of
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* Leading Zero's in a Number x
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define NUM_BITS_INT (sizeof(int)*8)
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int find(int);
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void main()
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{
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int n, i, a, count = 0, flag = 1, m = 1, j, cmp;
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printf("Enter the number
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");
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scanf("%d", &n);
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a = n >> 31 & 1;
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if (a == 0)
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{
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for (i = (NUM_BITS_INT)-1; i >= 0; i--)
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{
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a = (n >> i)& 1;
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if (a == 0)
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{
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count++;
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}
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else
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{
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for (j = n + 1;; j++)
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{
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cmp = find(j);
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if (cmp == (((NUM_BITS_INT)-1) - count) + 1)
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{
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printf("next higher power -> %d
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", j);
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break;
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}
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}
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break;
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}
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}
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}
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else
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{
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for (i = (NUM_BITS_INT)-1; i >= 0; i--)
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{
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a = (n >> i)& 1;
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if (a == 1)
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{
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count++;
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}
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else
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{
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for (j = n + 1;; j++)
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{
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cmp = find(j);
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if (cmp == (((NUM_BITS_INT)- 1) - count))
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{
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printf("next higher power -> %d
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", j);
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break;
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}
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}
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break;
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}
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}
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}
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}
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/* To find trailing zero's */
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int find(int n)
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{
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int count = 0, a, flag = 1, i;
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for (i = 0; i <= (NUM_BITS_INT) - 1; i++)
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{
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a = (n >> i) & 1;
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if (a == 1 && flag == 1)
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{
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return count;
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}
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else
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{
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count++;
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flag = 1;
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}
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}
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}
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Enter the number
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9
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next higher power -> 16
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Enter the number
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-20
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next higher power -> -16
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Enter the number
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44
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next higher power -> 64
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Enter the number
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-7
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next higher power -> -4
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Enter the number
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-31
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next higher power -> -16
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Enter the number
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-56
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next higher power -> -32
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Enter the number
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34
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next higher power -> 64
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