Write a c program to find out the prime numbers between 1 to 500?

Answer 1

Here is a simple program to generate prime numbers upto a given specific number

/*Prime No. from 1 to 50*/

/*By-Himanshu Rathee*/

#include<stdio.h>

#include<conio.h>

void main()

{

int i,j,n;

clrscr();

printf(" Enter the number upto which we have to find the prime number: ");

scanf("%d",&n);

printf("\n");

for(i=2;i<=n;i++)

{

for(j=2;j<=i-1;j++)

if(i%j==0)

break;

/*Number is divisble by some other number. So break out*/

if(i==j)

printf("\t%d",i);

/*Number was divisible by itself (that is, i was same as j)*/

}

/*Continue loop upto nth number*/

getch();

}

Answer 2

#include <iostream>

#include <math.h>

using namespace std;

int knum;

int i = 1;

int pt = 0;

bool is_prime;

int main()

{

cout << endl << endl;

cout << "This Program calulates the prime numbers between" << endl;

cout << "a given start and end number.";

start: cout << endl << endl << "Please enter a starting number (enter 0 to exit): ";

cin >> i;

if (i 0)

is_prime = false;

}// only when the "for" cycle is done we know for sure if "i" is prime

if (is_prime)

cout << i << ", ";

i++;

}

goto start;

close: cin.get();

return 0;

system("pause");

}

Answer 3

write a program to find Prime number between 1 to500