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DataStructure-Program to merge two 1-D arrays.

#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 ;
}

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