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- #include<stdio.h>
- #include<math.h>
- #include <conio.h>
- int isprime(int n){
- int i;
- if (n<2) return 0;
- if (n==2) return 1;
- for (i=2;i<=sqrt(n);i++) if (n%i==0) return 0;
- return 1;
- }
- int main(){
- int n;
- printf("Nhap 1 so nguyen: ");scanf("%d",&n);
- if (isprime(n)) printf("%d la so nguyen to",n);
- else printf("%d khong la so nguyen to",n);
- }
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