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What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


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Intersection of Array

Intersection of Array

Here your task is to ask user to enter any elements in a set of array and you have to extract the common elements among the set. For example lets us consider an array a[2, 4, 6, 8] and b[2, 5, 7, 11]. Then common element is 2

C Program - Intersection of Array

Let us write a c program to find intersecting elements from 2 arrays.

#include <stdio.h>
int main()
int a[10], b[10], flag = 0, n1, n2, i, j;
printf("Enter array1 size : ");
printf("\nEnter array2 size : ");
printf("\nEnter array1 element : ");
for(i = 0;i < n1;i++)
printf("\nEnter array2 element : ");
for(i = 0;i < n2;i++)
printf("Intersection: ");
for(i = 0;i < n1;i++)
for(j = 0;j < n2;j++)
if(b[i] == a[j])
flag = 1;
if(flag == 1)
printf("%d ", b[i]);
flag = 0;
return 0;
Enter array1 size : 5
Enter array2 size : 3
Enter array1 element : 1 2 3 4 5
Enter array2 element : 1 2 6
Intersection: 1, 2


Here we have two arrays, we compare every individual elements of one array(b[]) to elements in another array(a[]), if any of the element matches we raise the flag = 1 and print that particular element. This process is repeated until it reaches the last element in an array(b[]).

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