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 Categories  >>  Software  >>  Programming Languages  >>  C

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Question
`write the program for prime numbers?`
Question Submitted By :: Aaaa
I also faced this Question!!     Rank Answer Posted By

Re: write the program for prime numbers?
# 41
{
int n;
printf("\n Enter The Number\n");
scanf("%d",&n);
if(n>3 && n!=5 && n!=7)
if(n%2!=0)
if(n%3!=0)
if(n%5!=0)
if(n%7!=0)
printf("\n\n %d is a prime number",n);
else
printf("\n\n %d is not a prime number",n);
else
printf("\n\n %d is not a prime number",n);
else
printf("\n\n %d is not a prime number",n);
else
printf("\n\n %d is not a prime number",n);
else
printf("\n\n %d is a prime number",n);

getch();
}

 Is This Answer Correct ? 2 Yes 2 No
Vivek S

Re: write the program for prime numbers?
# 42
#include<stdio.h> \\harpreetdhillon7@gmail.com
#include<conio.h>
void main()
{
int i,n;
clrscr();
printf("enter any number which you want to check");
scanf("%d",&n);
for(i=2;i<=n-1;i++)
{
if(n%i==0)
{
printf("not a prime number\n");
break;
}
else
{
printf("prime number\n");
break;
}
}

 Is This Answer Correct ? 2 Yes 1 No
Harpreet Dhillon

Re: write the program for prime numbers?
# 43
namespace prime_381
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
int a;
int result;
int i, j;

private void button1_Click(object sender, EventArgs
e)
{

a = Convert.ToInt32(textBox1.Text);
prime();
textBox1.Clear();
textBox1.Focus();

}
int flag;
public void prime()
{
flag = 1;

for (i = 2; i <= a / 2; i++)
{
if (a % i == 0)
flag = 0;
}
if (flag == 1)
MessageBox.Show("Prime.");
else
MessageBox.Show("not Prime");
}
}
}

 Is This Answer Correct ? 0 Yes 0 No
Azka Sumbel

Re: write the program for prime numbers?
# 44
#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int num,i,count=0;
cout<<"Enter the number::";
cin>>num;
for(i=2;i<=num/2;i++)
{
if(num%i==0)
{
count++;
break;
}
}
if(count==0)
{
cout<<"The number is Prime";
}
else
cout<<"The number is Composite";
getch();
}

 Is This Answer Correct ? 2 Yes 2 No
Pran Pratim

Re: write the program for prime numbers?
# 45
# 10

Find all primes not larger than N.
I think it is the most efficient algorithm to find all
primes no larger than N.

int main(void)
{
int i,j, N;
int *pPrimes;
int nPrimes, is_prime;
printf("Input N:");
scanf("%d", &N);

pPrimes = new int [N/2];
nPrimes = 0;
for(i = 2; i<=N; i++)
{
is_prime = 1;
for(j=0;j<nPrimes; j++)
if (i%pPrimes[j] == 0)
{
is_prime = 0; break;
}
if (is_prime)
{
pPrimes[nPrimes++] = i;
}
}

printf("%d primes found less than %d:\n", nPrimes, N);
for (i=0; i< nPrimes; i++)
printf("%d ", pPrimes[i]);

 Is This Answer Correct ? 0 Yes 2 No
Dharanya

Re: write the program for prime numbers?
# 46
void main()
{
int i,k;int count=0;
int n;
printf("enter a no");
scanf("%d",&n);
for(i=2;i<=n;i++)
{
k=n%i;
if(k==0)
{
count++;
}
}
if(count==1)
printf("prime");
else
printf("not prime");
}

 Is This Answer Correct ? 1 Yes 0 No
D.sukumar

Re: write the program for prime numbers?
# 47
A PROG TO CHECK ANY NUMBER IS PRIME OR NOT BY USING IF ELSE STATEMENT
#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int x;
printf("enter number");
scanf("%d",&x);
if(x==1)
{
printf("the number is neither composite nor prime");
}
else if(x==2)
{
printf("the number is prime");
}
else if(x%2==0)
{
printf("the number is not prime");
}
else if(x%2!=0)
{
printf("the number is prime");
}
getch();
}

 Is This Answer Correct ? 1 Yes 0 No
Awais

Re: write the program for prime numbers?
# 48
#include<stdio.h>
main()
int 1
{
printf("enter a number");
scanf("%d",1)
}
printf("The number is a prime number");
else
printf("The number is not a prime number");
}

 Is This Answer Correct ? 1 Yes 2 No
Avinash

Re: write the program for prime numbers?
# 49
#include <stdio.h>
#include<stdlib.h>

#define TRUE 1
#define FALSE 0

int main()
{
int i,x,prime = TRUE;
printf(".:Modified Prime Program:.\n\n");
printf("Enter a number: ");
scanf("%d",&x);
printf("\nNUMBER\t REMARKS\n");
do
{
for(i=2;i<x;i++)
if(x%i==0)
{
prime=FALSE;
break;
}
if (prime=1 && (!(i<=x/2)))
printf("%d\t PRIME\n",x);
else
printf("%d\t COMPOSITE\n",x);
}
while (x-=1);
system ("pause");
return 0;
}

 Is This Answer Correct ? 0 Yes 0 No
Paul

Re: write the program for prime numbers?
# 50
#include<stdio.h>
int main()
{
int i,j,n,count=0;
printf("Enter the number:");
scanf("%d",&n);
for(i=2;i<=n;i++)
{
for(j=2;j<=i;j++)
{
if(i%j==0 && i/1==i)
{
count=count+1;
}
}
if(count==1)
{
printf("\n%d",i);
}
count=0;
}
}

 Is This Answer Correct ? 0 Yes 1 No
Nandhini

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