#include <stdio.h>

// Return the nth bit of x.
// Assume 0 <= n <= 31
unsigned get_bit(unsigned x,
                 unsigned n) {
    // YOUR CODE HERE
    // Returning -1 is a placeholder (it makes
    // no sense, because get_bit only returns 
    // 0 or 1)
    return -1;
}
// Set the nth bit of the value of x to v.
// Assume 0 <= n <= 31, and v is 0 or 1
void set_bit(unsigned * x,
             unsigned n,
             unsigned v) {
    // YOUR CODE HERE
}
// Flip the nth bit of the value of x.
// Assume 0 <= n <= 31
void flip_bit(unsigned * x,
              unsigned n) {
    // YOUR CODE HERE
}


/*
 * YOU CAN IGNORE THE REST OF THIS FILE
 */

void test_get_bit(unsigned x,
                  unsigned n,
                  unsigned expected) {
    unsigned a = get_bit(x, n);
    if(a!=expected) {
        printf("get_bit(0x%08x,%u): 0x%08x, expected 0x%08x\n",x,n,a,expected);
    } else {
        printf("get_bit(0x%08x,%u): 0x%08x, correct\n",x,n,a);
    }
}
void test_set_bit(unsigned x,
                  unsigned n,
                  unsigned v,
                  unsigned expected) {
    unsigned o = x;
    set_bit(&x, n, v);
    if(x!=expected) {
        printf("set_bit(0x%08x,%u,%u): 0x%08x, expected 0x%08x\n",o,n,v,x,expected);
    } else {
        printf("set_bit(0x%08x,%u,%u): 0x%08x, correct\n",o,n,v,x);
    }
}
void test_flip_bit(unsigned x,
                   unsigned n,
                   unsigned expected) {
    unsigned o = x;
    flip_bit(&x, n);
    if(x!=expected) {
        printf("flip_bit(0x%08x,%u): 0x%08x, expected 0x%08x\n",o,n,x,expected);
    } else {
        printf("flip_bit(0x%08x,%u): 0x%08x, correct\n",o,n,x);
    }
}
int main(int argc,
         const char * argv[]) {
    printf("\nTesting get_bit()\n\n");
    test_get_bit(0b1001110,0,0);
    test_get_bit(0b1001110,1,1);
    test_get_bit(0b1001110,5,0);
    test_get_bit(0b11011,3,1);
    test_get_bit(0b11011,2,0);
    test_get_bit(0b11011,9,0);
    printf("\nTesting set_bit()\n\n");
    test_set_bit(0b1001110,2,0,0b1001010);
    test_set_bit(0b1101101,0,0,0b1101100);
    test_set_bit(0b1001110,2,1,0b1001110);
    test_set_bit(0b1101101,0,1,0b1101101);
    test_set_bit(0b1001110,9,0,0b1001110);
    test_set_bit(0b1101101,4,0,0b1101101);
    test_set_bit(0b1001110,9,1,0b1001001110);
    test_set_bit(0b1101101,7,1,0b11101101);
    printf("\nTesting flip_bit()\n\n");
    test_flip_bit(0b1001110,0,0b1001111);
    test_flip_bit(0b1001110,1,0b1001100);
    test_flip_bit(0b1001110,2,0b1001010);
    test_flip_bit(0b1001110,5,0b1101110);
    test_flip_bit(0b1001110,9,0b1001001110);
    printf("\n");
    return 0;
}