C program to print first n Prime Number with explanation

Interview Preparation

In this tutorial, we are going to write a program in C to print the first N Prime Number. Basically, on the basis of the given input, our program will print the Prime Number.

For example, if we want to print the first 5 prime numbers, Our program will take 5 as an input and it will print 2,3,5,7,11 as an output.

What is Prime number?

A prime number is a number that can only divide by 1 and the number itself.

for example, 2, 3, 5 etc are the prime number. Here 2 and 3 can only be divided by 1 and number itself.

But 4 or 6 is not a prime number because 4 can be divided by 2 and 6 can be divided by 2 and 3.

Let’s see the program in C

C Program to print first n Prime Number

#include<stdio.h>
void main(){
    int i=0,n,temp,temp1=1;
	printf("Please give input a number: ");
	scanf("%d",&n);
	while(temp1<=n){
        temp=0;
        for(i=2;i<=(temp1/2);i++){
		if(temp1%i==0)
		{
            temp=1;
            break;
		}
	}
	if(temp==0)
		printf("%d is  a prime number \n",temp1);
	temp1++;
	}
}

Output

program in C to print first n Prime Number

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