Write C Program to Merge Two arrays in C Programming

C Programming
Program : C Program to Merge Two arrays in C Programming 

#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
       
Updated on 17-Jan-2022 9:28:10

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