Question

Your task is to add code to this function in common_elements.c:

int common_elements(int length, int source1[length], int source2[length], int destination[length]) {
    // PUT YOUR CODE HERE (you must change the next line!)
    return 42;
}

common_elements should copy the values in the first source array which are also found in the second source array, into the third array.

Answer 1

#include <stdio.h>
int common_elements(int length,int source1[length],int source2[length],int destination[length])
{ // copies common elements into destination array and returns count of such common elements
int c = 0; // variable to count total number of common elements
for(int i=0;i<length;i++) // looping through all elements in first array
{
for(int j=0;j<length;j++) // looping through all elements in second array
{
if (source1[i]==source2[j]) // checking if element in first arrary is present in second
{
destination[c] = source1[i]; // copying to destination array
c++; // incrementing the count
break; // breaking out from second loop
}
}
}
return c; // returning the total number of common element
}
int main()
{ // driver code
int a[6] = {1,5,2,4,6,9}; // sample array 1
int b[6] = {0,4,1,5,7,8}; // sample array 2 (you can change them)
int c[6]; // destination array
int length = 6; // defining sample length
int no = common_elements(length,a,b,c); // calling above method
for(int i=0;i<no;i++) // printing out common elemtns stored in destination array
printf("%d \n",c[i]);
return 0;
}

Sample output: