programming-examples/c/Arrays/C Program to Merge and Sort Elements of 2 different arrays.c

/*
 * C Program to Merge and Sort Elements of 2 different arrays
 */
#include <stdio.h>

void Merge(int *, int, int, int );

void MergeSort(int *array, int left, int right)
{
    int middle = (left+right)/2;
    /* We have to sort only when left<right because when left=right it is anyhow sorted*/
    if(left<right)
        {
            /* Sort the left part */
            MergeSort(array, left, middle);
            /* Sort the right part */
            MergeSort(array, middle + 1, right);
            /* Merge the two sorted parts */
            Merge(array, left, middle, right);
        }
}
/* Merge functions merges the two sorted parts */
void Merge(int *array, int left, int middle, int right)
{
    /*to store sorted array*/
    int tmp[right - left + 1];
    int pos = 0, leftposition = left, rightposition = middle + 1;
    while (leftposition <= middle && rightposition <= right)
        {
            if (array[leftposition] < array[rightposition])
                {
                    tmp[pos++] = array[leftposition++];
                }
            else
                {
                    tmp[pos++] = array[rightposition++];
                }
        }
    while (leftposition <= middle)
        tmp[pos++] = array[leftposition++];
    while (rightposition <= right)
        tmp[pos++] = array[rightposition++];
    int i;
    /* Copy back the sorted array to the original array */
    for (i = 0; i < pos; i++)
        {
            array[i + left] = tmp[i];
        }
    return;
}
int main()
{
    int size;
    printf("\n enter the size of an array");
    scanf("%d", &size);
    int array[size];
    int i, j, k;
    printf("\n enter the array elements");
    for (i = 0; i < size; i++)
        {
            scanf("%d", &array[i]);
        }
    /* Calling this functions sorts the array */
    MergeSort(array, 0, size - 1);
    for (i = 0; i < size; i++)
        {
            printf("%d ", array[i]);
        }
    printf("\n");
    return 0;
}

/*

enter the size of an array10

enter the array elements-12
10
45
32
49
-58
69
38
98
34
-58 -12 10 32 34 38 45 49 69 98