K & R C Programs Exercise 2-7.

K and R C, Solution to Exercise 2-7:
 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 invert(x, p, n) that returns x with the n bits that begin at position p inverted(i.e, 1 changed into 0 and vice versa), leaving the others unchanged.Read more about C Programming Language .

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unsigned invert(unsigned x, int p, int n)
return x ^ (~(~0U << n) << p);

/* Program for testing */

#include <stdio.h>

int main(void)
unsigned x;
int p, n;

for(x = 0; x < 500; x += 49)
for(n = 1; n < 8; n++)
for(p = 1; p < 8; p++)
printf("%u, %d, %d: %un", x, n, p, invert(x, n, p));
return 0;

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