2020-10-02 08:21:09

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

int isPrime(int n) {

	if (n < 2) return 0;

	for (int i = 2; i <= sqrt(n); i++) 
		if (n % i == 0) return 0;
	
	return 1;
	
}

int main() {

	int n; 
	printf("\nEnter n: ");
	scanf("%d", &n);
	printf("%d", isPrime(n));
	
	return 0;

}

2020-10-02 08:20:33

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
// Exercise 1.
void isPrime(int n) {
	int i; 
	int num = 1;
	
	if(n==1)
	    printf("\nE");
	    else{
	    	for(i=2; i<=sqrt(n); i++){
	    		num = 1;
	    		if(n%i==0){
	    			num = 0;
				}
			}
			if(num==1){
				printf("\n%d la so nguyen to.", n);
			}else{
				printf("\n%d khong phai la so nguyen to.", n);
			}
		}
	    
}

int main(int argc, char *argv[]) {
	
	int n;
	
	printf("\nNhap n: ");
	scanf("%d", &n);
	
	isPrime(n);
	
	return 0;
}

2020-10-02 08:20:04

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

void swap(int &a, int &b) {
	
	int temp = a; a = b; b = temp;
	
}

int isPrime(int n) {

	if (n < 2) return 0;

	for (int i = 2; i <= sqrt(n); i++) 
		if (n % i == 0) return 0;
	
	return 1;
	
}

int main() {

	int n, m;
	printf("\nPlease Enter n, m: ");
	scanf("%d%d", &n, &m);
	
	printf("\nThe prime numbers between %d and %d: ", n, m);
	
	if (n > m) swap(n, m);
	
	bool check = false;
	
	for (int i = n; i <= m; i++) 
		if (isPrime(i)) printf("\n%d", i), check = true;
		
	if (!check) printf("\nThere are no prime numbers.");
		
	return 0;

}

2020-10-02 08:17:51

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//BAI SO 1:
int main(int argc, char *argv[]) {
	int a;
	printf("\nNhap so a=");
	scanf("%d", &a);
	
	if(a < 2){
		printf("\nDay khong phai la so nguyen to.", a);
		return 0;
	}else{
		int i;
		int sum = 1;
		for(i = 2;i <= sqrt(a);i++){
			if(a%i == 0){
				sum++;
			}
		}
		if(sum = 1){
			printf("\nDay la so nguyen to:%d", a);
		}else{
			printf("\nDay khong phai la so nguyen to:%d", a);
		}
	}
	return 1;
}

2020-10-02 08:16:51

//Exercise1:
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int isPrime(int number){
	if(number<2){
		printf("\nThere is no prime number!");
		return 0;
	}
	int count=0;
	for(int i=2;i<=sqrt(number);i++){
		if(number%i==0){
			count++;
		}
	}
	if(count==0){
		printf("\nThis is the prime number");
		return 1;
	}else{
		printf("\nThis is not the prime number");
		return 0;
	}
}
int main(){
	int number;
	printf("\nEnter number to check: ");
	scanf("%d", &number);
	isPrime(number);
	return 0;
}

2020-10-02 08:12:23

#songuyento.cpp

#include <stdio.h>
#include <math.h>
 
int main()
{
	bool IsPrime(int n)
    int n;
    printf("\nNhap n = ");
    scanf("%d", &n);
    
    if(n < 2)
	{
        printf("\n%d Khong phai so nguyen to", n);
        return 0;
    }
    int count = 0;
    for(int i=2; i<=sqrt(n); i++)
	{
        if(n % i == 0){
            count++;
        }
    }
    if(count == 0)
	{
        printf("\n%d la so nguyen to", n);
    }else
	{
        printf("\n%d hong phai so nguyen to", n);
    }
}

2020-10-02 08:03:10

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
typedef int So_nguyen; 

int main(int argc, char *argv[]) {
	int n, i;
	
	printf("\nNhap n = ");
	scanf("%d", &n);
	
	if(n<2) {
		printf("\n%d khong phai la so nguyen to", n);
	}
	
	int count=0;
	for(i=2;i<=sqrt(n);i++) {
		if(n%i==0) {
			count++;
		}
	}
	if(count==0) {
		printf("\n%d la so nguyen to", n);
	} else {
		printf("\n%d khong phai la so nguyen to", n);
	}
	
	return 0;
}

2020-10-02 07:56:05

So nguyen to

#include <stdio.h>
#include <math.h>
 
int main()
{
	
    int n;
    printf("\nNhap n = ");
    scanf("%d", &n);
    
    if(n < 2)
	{
        printf("\n%d Khong phai so nguyen to", n);
        return 0;
    }
    int count = 0;
    for(int i=2; i<=sqrt(n); i++)
	{
        if(n % i == 0){
            count++;
        }
    }
    if(count == 0)
	{
        printf("\n%d la so nguyen to", n);
    }else
	{
        printf("\n%d Khong phai so nguyen to", n);
    }
}