C Asal Sayı Bulma

 
 #include <iostream> 
  
 using namespace std; 
  
 int main() 
 { 
  
 	int asalSayi; 
 	bool asal = true; 
 	for (asalSayi = 2; asalSayi < 100; asalSayi++) 
 	{ 
 		for (int i = 2; i < asalSayi; i++) 
 		{ 
 			if (asalSayi % i == 0) 
 				asal = false; 
 		} 
 		if (asal == true) 
 			cout << asalSayi << endl; 
 		asal = true; 
  
 	} 
 	system("pause"); 
  
 }

 
 #include <iostream>  
  
 using namespace std; 
  
 int main() 
 { 
  
 	int asalSayi; 
 	bool asal = true; 
 	for (asalSayi = 2; asalSayi < 100; asalSayi++) 
 	{ 
 		if (asalSayi < 9) { 
 			for (int i = 2; i < asalSayi; i++) 
 			{ 
 				if (asalSayi % i == 0) 
 					asal = false; 
 			} 
 			if (asal == true) 
 				cout << asalSayi << endl; 
 			asal = true; 
 		} 
 		else { 
 			for (int i = 2; i < 10; i++) 
 			{ 
 				if (asalSayi % i == 0) 
 					asal = false; 
 			} 
 			if (asal == true) 
 				cout << asalSayi << endl; 
 			asal = true; 
 		} 
  
 	} 
 	system("pause"); 
  
 } 
  
 

 
 #include <iostream>  
 #include <cmath> 
  
 using namespace std; 
  
 int main() 
 { 
 	int asalSayiBoyut; 
 	cout << "Hangi sayiya kadar olan asal sayilar hesaplansin :"; 
 	cin >> asalSayiBoyut; 
 	int asalSayiKok = sqrt(asalSayiBoyut); 
 	int asalSayi; 
 	bool asal = true; 
 	for (asalSayi = 2; asalSayi < asalSayiBoyut; asalSayi++) 
 	{ 
 		if (asalSayi < asalSayiKok) { 
 			for (int i = 2; i < asalSayi; i++) 
 			{ 
 				if (asalSayi % i == 0) 
 					asal = false; 
 			} 
 			if (asal == true) 
 				cout << asalSayi << endl; 
 			asal = true; 
 		} 
 		else { 
 			for (int i = 2; i < asalSayiKok; i++) 
 			{ 
 				if (asalSayi % i == 0) 
 					asal = false; 
 			} 
 			if (asal == true) 
 				cout << asalSayi << endl; 
 			asal = true; 
 		} 
  
 	} 
 	system("pause"); 
  
 }

#include <stdio.h>
#include <math.h>

int checkPrimeNumber(int n);
int checkArmstrongNumber(int n);

int main()
{
    int n, flag;

    printf("Enter a positive integer: ");
    scanf("%d", &n);

    // Check prime number
    flag = checkPrimeNumber(n);
    if (flag == 1)
        printf("%d is a prime number.
", n);
    else
        printf("%d is not a prime number.
", n);

    // Check Armstrong number
    flag = checkArmstrongNumber(n);
    if (flag == 1)
        printf("%d is an Armstrong number.", n);
    else
        printf("%d is not an Armstrong number.",n);
    return 0;
}

int checkPrimeNumber(int n)
{
    int i, flag = 1;

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

    // condition for non-prime number
        if(n%i == 0)
        {
            flag = 0;
            break;
        }
    }
    return flag;
}

int checkArmstrongNumber(int number)
{
    int originalNumber, remainder, result = 0, n = 0, flag;

    originalNumber = number;

    while (originalNumber != 0)
    {
        originalNumber /= 10;
        ++n;
    }

    originalNumber = number;

    while (originalNumber != 0)
    {
        remainder = originalNumber%10;
        result += pow(remainder, n);
        originalNumber /= 10;
    }

    // condition for Armstrong number
    if(result == number)
        flag = 1;
    else
        flag = 0;

    return flag;
}