K & R C Programs Exercise 2-6.

K and R C, Solution to Exercise 2-6:
 K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition) You can learn and solve K&R C Programs Exercise.
C Function setbits(x, p, n, y) that returns x with the n bits that begin at position p set to the rightmost n bits of y, leaving the other bits unchanged.Read more about C Programming Language .

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#include <stdio.h>

unsigned setbits(unsigned x, int p, int n, unsigned y)
return (x & ((~0 << (p + 1)) | (~(~0 << (p + 1 - n))))) | ((y & ~(~0 << n)) << (p + 1 - n));

int main(void)
unsigned i;
unsigned j;
unsigned k;
int p;
int n;

for(i = 0; i < 30000; i += 511)
for(j = 0; j < 1000; j += 37)
for(p = 0; p < 16; p++)
for(n = 1; n <= p + 1; n++)
k = setbits(i, p, n, j);
printf("setbits(%u, %d, %d, %u) = %un", i, p, n, j, k);
return 0;

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