Merging two unsorted arrays -- 1-D Arrays -- DSA in C

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// Merging two unsorted arrays. Output array need not be sorted.
 
#include<stdio.h>
 
int main() {
 
    int arr1[10], arr2[10], arr3[20];
 
    int i, n1, n2, m, index = 0; 
 
    printf("Enter number of elements for first array: ");
    scanf("%d", &n1);
    printf("\n");
 
    for(i=0; i<n1; i++) {
 
        printf("arr1[%d] = ", i);
        scanf("%d", &arr1[i]);
        printf("\n");
 
    }
 
 
    printf("Enter number of elements for second array: ");
    scanf("%d", &n2);
    printf("\n");
 
    for(i=0; i<n2; i++) {
 
        printf("arr2[%d] = ", i);
        scanf("%d", &arr2[i]);
        printf("\n");
 
    }
 
 
    m = n1 + n2; // total number of elements in array3
 
    for(i=0; i<n1; i++) {
 
        arr3[index] = arr1[i];
        index++; // the index where iteration last stopped for array1. This will be used for continuation of insertion of elements into array3 from array2.
 
    } // insert elements into array3 from array1
 
 
    for(i=0; i<n2; i++) {
 
        arr3[index] = arr2[i];
        index++; // increments the value of index by 1 from that point onwards.
 
    }   // insert elements into array3 from array2
 
    printf("The merged array is: \n");
    
    for(i=0; i<m; i++) {
 
        printf("arr3[%d] = %d \n", i, arr3[i]);
 
    }
 
 
}

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