2020-10-02 08:38:26

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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//Bai 1:
 int main(int argc, char *argv[]) {
	int n, i;
	printf("Nhap so nguyen n: ");
	scanf("%d",&n);
	int count=0;
	for(i=2; i<n; i++){
		if (n%i==0){
			count++;
	}}
	if (count == 0){
		printf("\n%d la so nguyen to", n);
	}else ("\n%d khong phai la so nguyen to", n);
	return 0;
}

//Bai 2:
int main(int argc, char *argv[]) {
int m, n, count, j,i;
printf("Nhap n = "); scanf("%d",&n);
printf("Nhap m = "); scanf("%d",&m);
for(j=n;j<m;j++){
int count=0;
	for(i=2; i<j; i++){
		if (j%i==0){
			count++;
	}}
	if (count == 0){
		printf("\n%d ", j);}}
return 0;
}

2020-10-02 08:31:44

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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//bat dau code;
//bai 1;
int main(int argc, char *argv[]) {
	int n;
	printf("\nNhap so nguyen n: ");
	scanf("%d", &n);
	if(n < 2) {
		printf("%d khong la so nguyen to.\n");
		} else {
			int i;
			int mark = 1;
			for(i = 2; i <= sqrt(n); i++) {
				if(n % i == 0) {
					mark = 0;
					break;
				}
			}
			if(mark == 1) {	
				printf("%d la so nguyen to.\n");
			} else {
				printf("%d khong là so nguyen to.\n", n);
			}
			
		}		
		//ket thuc code;
					
	return 0;
}

2020-10-02 08:31:28

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

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

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

2020-10-02 08:30:54

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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//bat dau code;
//bai 1;
int main(int argc, char *argv[]) {
	int n;
	printf("\nNhap so nguyen n: ");
	scanf("%d", &n);
	if(n < 2) {
		printf("%d khong la so nguyen to.\n");
		} else {
			int i;
			int mark = 1;
			for(i = 2; i <= sqrt(n); i++) {
				if(n % i == 0) {
					mark = 0;
					break;
				}
			}
			if(mark == 1) {	
				printf("%d la so nguyen to.\n");
			} else {
				printf("%d khong là so nguyen to.\n", n);
			}
			
		}		
		//ket thuc code;
					
	return 0;
}

2020-10-02 08:25:49

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

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

int main() {
	int n;
	printf("Nhap so nguyen n: ");
	scanf("%d", &n);
	if(n < 2) {
		printf("%d khong la so nguyen to.\n, n");
	} else {
		int i;
		int mark = 1;
		for( i = 2; i <= sqrt(n), i++ ) {
			if(n % i == 0) {
				mark = 0;
				break;
			}
		}
		if(mark == 1) {
			printf("%d khong la so nguyen to.\n");
	    }
	    if(mark == 1) {
	    	printf("%d la so nguyen to.\n", n);
		} else {
			printf("%d khong la so nguyen to.\n", n);
			
		}
	}	
	return 0;
}

2020-10-02 08:24:52

//Exercier 1
#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 */


int isPrime(int n);

int main(int argc, char *argv[]) {
	int number;
	isPrime(number);
	
		
	return 0;
}

int isPrime(int n) {
	int i, j, count = 0;
	printf("\nNhap so can kiem tra: ");
	scanf("%d", &i);
	
	for(j=2;j<i;j++) {
		if (i % j == 0) {
			count++;
			printf("0");
			
	} 
	
	}
	if (count < 1) {
		printf("1");
	}
			

	}

2020-10-02 08:24:16

#include<stdio.h>

#include<math.h>

void Ngto(int n) {
        int i;
        int ngt=1;
        if(n==1)
            printf("K");
        else {
            for(i=2; i<=sqrt(n); i++) {
                ngt=1;
                if(n%i==0) {
                    ngt=0;
                }
           }
           if(ngt==1)
                printf("%d la so nguyen to",n);
           else
                printf("%d khong phai la so nguyen to",n);
    }

}

int main() {
    int n;
    printf("Nhap n: ");
    scanf("%d",&n);
    
      Ngto(n);

}

2020-10-02 08:23:52

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

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

int main(int argc, char *argv[]) {
	int n,t;
	int i=2;
	t=0;
	printf("\n nhap so nguyen to n: ");
	scanf("%d",&n);
	
	if(n<2){
		printf ("\n n khong pahi la so nguyen to ");}
for(i=2;i<n-1;i++){
	if(n%i==0){
	t++;
printf("\n %d k phai la so nguyen to",n);}}
if (t==0){
	printf ("\n %d la so nguyen to ",n);
}
	return 0;
}

2020-10-02 08:21:50

bai 1

#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 */

int main(int argc, char *argv[]) {
	printf("\n===============bai 1===========");
      int number;
    printf("\nNhap so can kiem tra = ");
    scanf("%d", &number);
 
    int i = 2;
    int c=0;
    for (; i <= sqrt(number); i++) {
        if (number % i == 0) {
            c++;
        }
    }
 
    if(c == 0 && number > 1){
        printf("\n%d la so nguyen to", number);
    }else{
        printf("\n%d khong phai la so nguyen to!", number);
    }

 
	return 0;
}

2020-10-02 08:21:27

#include<stdio.h>

#include<math.h>

int main(){
	
int n;

printf ("\n Nhap so isPrime : ");

scanf ("%d", &n);	

printf ("\n");

if (n==2){
	
	printf ("\ %d la so nguyen to ",n);
	
	return 1;
}
else {
	
	for (int i=2 ; i <= int(sqrt(n)); i++){
		if (n%i==0){
			
			printf ("\n %d khong phai la so nguyen to ",n);
			
			return 0;
		}
	}
}
return 1;
}