Examples of reference parameters in C language functions

When a parameter passed to a function uses a reference, when the parameter value is modified within the function, the corresponding parameter outside the function is modified.

void square( int *powers)
{
    *powers=*powers * *powers;
}
int main()
{
    printf("Hello lautturi!\n\n");
    int i;
    int array[] = {1, 2, 3, 4, 5};
    for (i=0; i<5; i++)
    {
        square(&array[i]); // Passing the address of array to the function
    }
    for (i=0; i<5; i++)
    {
        printf("%d ",array[i]);
    }
    return 0;
}

output

Hello lautturi!

1 4 9 16 25