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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);
printf("Prime numbers Upto %d are \n",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 \n",temp1);
temp1++;
}
}Output
Please give input a number: 26
Prime numbers Upto 26 are
1
2
3
5
7
11
13
17
19
23