Subtract two 1D array in C

#include<stdio.h>

int main()

{

    int array[100],array1[100],subtract[100];

    int i,n,m,index;

    printf("Please Enter The 1st array size: ");

    scanf("%d",&n);

    printf("
Please Enter %d elements of the array: 
",n);

    for(i=0; i<n; i++)

    {

        scanf("%d",&array[i]);

    }

    printf("
Please Enter The 2nd array size: ");

    scanf("%d",&m);

    printf("
Please Enter %d elements of the array: 
",m);

    for(i=0; i<m; i++)

    {

        scanf("%d",&array1[i]);

    }

    ///subtraction

    for(i=0; i<n; i++)

    {

        subtract[i]=array[i]-array1[i];

    }

    if(n!=m) /// total element of two array need to be same.

    {

        printf("Not possible to Add
");

    }

    else

    {

        printf("
The sum of two array is: ");

        for(i=0; i<n; i++)

        {

            printf("%d ",subtract[i]);

        }

    }

    printf("
");

    return 0;

}