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## Full Code:

## Code Explanation :

In this example, we are going to learn to prime number in array. We have declared an array with certain prime and non-prime numbers, then print the elements with the message 'prime' and 'Not prime'.

We have to check whether number is prime or not from given single dimension array.

**Example:**

Input: Array elements are: 120, 200, 35, 13, 7, 10, 3, 90 Output: 120 - Not Prime 200 - Not Prime 35 - Not Prime 13 - Prime 7 - Prime 10 - Not Prime 3 - Prime 90 - Not Prime

**Logic:**

- We have declared an array (
`arr`) with the elements: 120, 200, 35, 13, 7, 10, 3, 90 - To test the prime numbers, we declare an
`isPrime()`

function returning 1, if number is prime and returning 0 if number is not prime. - Then we have used a loop with 0 to len-1 (
**total number of array elements**) and call`isPrime()`

by moving array elements one by one (`arr[loop]`

) in`main()`

function. - Then we check a print statement condition:
`(isPrime(arr[loop])?"Prime":"Not Prime"))`

. This return "Prime", if`isPrime(arr[loop])`

returns 1 and return "Not Prime", if`isPrime(arr[loop])`

returns 0.

This is the main concept of this program.

If you want to do smae problem without using function then it is very easy.

#include <stdio.h> int isPrime(int); int main() { int loop, i, flag; //loop counter //declaring array with prime and not prime numbers int arr[]={100, 200, 31, 13, 97, 10, 20, 11}; //calculate length of the array int len = sizeof(arr)/sizeof(arr[0]); //print array elements with message //"prime" or "Not prime" for(loop=0; loop < len; loop++) { flag = 0; for(i=2; i < arr[loop] / 2; i++) { if(arr[loop] % i ==0) { flag = 1; break; } } //flag is 1, if number is not prime if(flag == 1){ printf("%3d - Not Primen",arr[loop]); } else { printf("%3d - Primen",arr[loop]); } } printf("n"); return 0; }

The algorithm and flowchart of this progrem is:

## Algorithm

STEP 1 : Start; STEP 2 : Declare variable arr[], loop, i and flag; STEP 3 : Initialize arr[] = {100, 200, 31, 13, 97, 10, 20, 11}; STEP 4 : Get the length of array; STEP 4 : Repeat this process until loop < len STEP 4.1 : flag = 0 STEP 4.2 : Repeat this process until i < arr[loop] STEP 4.2.1 : flag = 1 STEP 4.2.2 : break STEP 4.3 : IF flag == 1 THEN Print prime ELSE Print not prime STEP 4.4 : loop++ STEP 5 : End

## Flowchart

If you got any problem on understanding this example then please comment below.

Our example mainly covers following topics in any programing

- Basic Programs
- Number Programs
- Array Programs
- Matrix Programs
- Pattern Programs
- String Programs
- Tree Programs
- Singly Linked List Programs
- Circular Linked List Programs
- Doubly Linked List Programs

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