Question

Write, specify and prove the function reverse that reverses an array in place. Take care
of the unmodified part of the array at some iteration of the loop. Assume that the swap
function is already proved. Note: Prototype is as below. [7 M] [CO2]
void swap(int* a, int* b);
void reverse(int* array, size_t len){
}

Answer 1

#include <stdio.h>

void swap(int *a, int *b)

{

    if (a != b)

    {

        *a += *b;

        *b = *a - *b;

        *a -= *b;

    }

}

void reverse(int *array, size_t len)

{

    size_t i = len - 1;

    size_t j = 0;

    while (i > j)

    {

        swap(array[i],array[j]);

        i--;

        j++;

    }

}

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