arrayconcat.c

//Program for array concatination with dynamic memory allocation
#include<stdio.h>
#include<stdlib.h>
int main(){
	int *arr1,*arr2;
	int n1,n2;
	int i,total,counter;
	printf("Enter the number of elements to be entered in arr1 and arr2 ");
	scanf("%d %d",&n1,&n2); //taking the number of elements for the arrays from the user
	arr1=(int *)malloc(n1 * sizeof(int));
	arr2=(int *)malloc(n2 * sizeof(int));
	printf("\nEnter the elements for arr1 : ");
	//Taking array input from the user
	for(i=0;i<n1;i++){
		scanf("%d",&arr1[i]);
	}
	printf("\nEnter the elements for arr2 : ");
	for(i=0;i<n2;i++){
		scanf("%d",&arr2[i]);
	}
	//Now concatination
	arr1=(int *)realloc(arr1,(n1+n2)*sizeof(int));
	total=n1+n2;
	counter=0;
	for(i=n1;i<total;i++){
		arr1[i]=arr2[counter];
		counter++;
	}
	printf("\nArray1 after concatination : ");
	for(i=0;i<total;i++){
		printf("%d ",arr1[i]);
	}
	getchar();
	return 0;
}

/*
OUTPUT : 
Enter the number of elements to be entered in arr1 and arr2 2
3

Enter the elements for arr1 : 7
8

Enter the elements for arr2 : 9
4
5

Array1 after concatination : 7 8 9 4 5

*/