Programming Example
C Program to Merge Two arrays in C Programming
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);
}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
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.