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#include <stdio.h>
 
int main(void) {
	long songuyento;
	printf("Moi nhap so nguyen to : ");
	scanf("%ld",&songuyento);
 
	if(isPrimeNumber(songuyento)){
		printf("La so nguyen to");
	}
	else{
		printf("Khong la so nguyen to");
	}
	return 0;
}
//tra ve 1 neu dau vao la so nguyen to, tra ve 0 neu dau vao k phai la so nguyen to
int isPrimeNumber(long a){
	if(a==0 || a==1) return 0;
	else if(a==2|| a==3) return 1;
	else{
		long b = (long)sqrt(a);//trong 1 chuong trinh kiem tra so nguyen t thi chi can kiem tra tu 2 -> can bac 2 cua so do
		for(long i=2; i <b ; i++){
		 	if(a % i == 0) // Neu a chia het cho i tuc la a k phai so nguyen to
				return 0;				
			}
			else{
				return 1;
			}
		}
	}
}
 

prog.c: In function 'main':
prog.c:8:2: warning: implicit declaration of function 'isPrimeNumber' [-Wimplicit-function-declaration]
  if(isPrimeNumber(songuyento)){
  ^
prog.c: In function 'isPrimeNumber':
prog.c:21:3: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
   long b = (long)sqrt(a);//trong 1 chuong trinh kiem tra so nguyen t thi chi can kiem tra tu 2 -> can bac 2 cua so do
   ^
prog.c:21:18: warning: incompatible implicit declaration of built-in function 'sqrt'
   long b = (long)sqrt(a);//trong 1 chuong trinh kiem tra so nguyen t thi chi can kiem tra tu 2 -> can bac 2 cua so do
                  ^
prog.c:22:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(long i=2; i <b ; i++){
   ^
prog.c:22:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
prog.c:26:4: error: 'else' without a previous 'if'
    else{
    ^
prog.c: At top level:
prog.c:31:1: error: expected identifier or '(' before '}' token
 }
 ^

Standard output is empty