Merging of Two One Dimensional Arrays in C

A simple program that I wrote before to merge two dimensional arrays using C Programming language.

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Program Listing

#include <stdio.h>

#include <conio.h>

#include <alloc.h>

#define MAX1 5

#define MAX2 7

int *arr ;

int* create ( int ) ;

void sort ( int *, int ) ;

void display ( int *, int ) ;

int* merge ( int *, int * ) ;

void main( )

{

int *a, *b, *c ;

clrscr( ) ;

printf (  "\nEnter elements for first array: \n\n" ) ;

a = create ( MAX1 ) ;

printf ( "\nEnter elements for second array: \n\n" ) ;

b = create ( MAX2 ) ;

sort ( a, MAX1 ) ;

sort ( b, MAX2 ) ;

printf ( "\nFirst array: \n" ) ;

display ( a, MAX1 ) ;

printf ( "\n\nSecond array: \n" ) ;

display ( b, MAX2 ) ;

printf ( "\n\nAfter Merging: \n" ) ;

c = merge ( a, b ) ;

display ( c, MAX1 + MAX2 ) ;

getch( ) ;

}

/* creates array of given size, dynamically */

int* create ( int size )

{

int *arr, i ;

arr = ( int * ) malloc ( sizeof ( int ) * size ) ;

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

{

printf ( "Enter the element no. %d: ", i + 1 ) ;

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

}

return arr ;

}

/* sorts array in ascending order */

void sort ( int *arr, int size )

{

int i, temp, j ;

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

{

for ( j = i + 1 ; j < size ; j++ )

{

if ( arr[i] > arr[j] )

{

temp = arr[i] ;

arr[i] = arr[j] ;

arr[j] = temp ;

}

}

}

}

/* displays the contents of array */

void display ( int *arr, int size )

{

int i ;

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

printf (  "%d\t", arr[i] ) ;

}

/* merges two arrays of different size */

int* merge ( int *a, int *b )

{

int *arr ;

int i, k, j ;

int size = MAX1 + MAX2 ;

arr = ( int * ) malloc ( sizeof ( int ) * ( size ) ) ;

for ( k = 0, j = 0, i = 0 ; i <= size ; i++ )

{

if ( a[k] < b[j] )

{

arr[i] = a[k] ;

k++ ;

if ( k >= MAX1 )

{

for ( i++ ; j < MAX2 ; j++, i++ )

arr[i] = b[j] ;

}

}

else

{

arr[i] = b[j] ;

j++ ;

if ( j >= MAX2 )

{

for ( i++ ; k < MAX1 ; k++, i++ )

arr[i] = a[k] ;

}

}

}

return arr ;

}