C Program to Merge Two arrays in C Programming

Data Structure Array (Article) Array (Program)

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Program:

#include<stdio.h>

int main() {
	int arr1[30], arr2[30], res[60];
	int i, j, k, n1, n2;

	printf("\nEnter no of elements in 1st array :");
	scanf("%d", &n1);
	for (i = 0; i < n1; i++) {
		scanf("%d", &arr1[i]);
	}

	printf("\nEnter no of elements in 2nd array :");
	scanf("%d", &n2);
	for (i = 0; i < n2; i++) {
		scanf("%d", &arr2[i]);
	}

	i = 0;
	j = 0;
	k = 0;

	// Merging starts
	while (i < n1 && j < n2) {
		if (arr1[i] <= arr2[j]) {
			res[k] = arr1[i];
			i++;
			k++;
		} else {
			res[k] = arr2[j];
			k++;
			j++;
		}
	}

	/* Some elements in array 'arr1' are still remaining
	 where as the array 'arr2' is exhausted */

	while (i < n1) {
		res[k] = arr1[i];
		i++;
		k++;
	}

	/* Some elements in array 'arr2' are still remaining
	 where as the array 'arr1' is exhausted */

	while (j < n2) {
		res[k] = arr2[j];
		k++;
		j++;
	}

	//Displaying elements of array 'res'
	printf("\nMerged array is :");
	for (i = 0; i < n1 + n2; i++)
		printf("%d ", res[i]);

	return (0);

}

Output:

Enter no of elements in 1st array : 4
11 22 33 44

Enter no of elements in 2nd array : 3
10 40 80

Merged array is : 10 11 22 33 40 44 80

Explanation:

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