Merging two sorted arrays into a third sorted array

/* Program of merging two sorted arrays into a third sorted array*/
#include<stdio.h>

main()
{
int arr1[20],arr2[20],arr3[40];
int i,j,k;
int max1,max2;

printf("Enter the number of elements in list1 : ");
scanf("%d",&max1);
printf("Take the elements in sorted order :\n");
for(i=0;i<max1;i++)
{
printf("Enter element %d : ",i+1);
scanf("%d",&arr1[i]);
}
printf("Enter the number of elements in list2 : ");
scanf("%d",&max2);
printf("Take the elements in sorted order :\n");
for(i=0;i<max2;i++) {
printf("Enter element %d : ",i+1);
scanf("%d",&arr2[i]);
}
/* Merging */
i=0; /*Index for first array*/
j=0; /*Index for second array*/
k=0; /*Index for merged array*/

while( (i < max1) && (j < max2) )
{
if( arr1[i] < arr2[j] )
arr3[k++]=arr1[i++];
else
arr3[k++]=arr2[j++];
}/*End of while*/
/*Put remaining elements of arr1 into arr3*/
while( i < max1 )
arr3[k++]=arr1[i++];
/*Put remaining elements of arr2 into arr3*/
while( j < max2 )
arr3[k++]=arr2[j++];

/*Merging completed*/
printf("List 1 : ");
for(i=0;i<max1;i++)
printf("%d ",arr1[i]);
printf("\nList 2 : ");
for(i=0;i<max2;i++)
printf("%d ",arr2[i]);
printf("\nMerged list : ");
for(i=0;i<max1+max2;i++)
printf("%d ",arr3[i]);
printf("\n");
}