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- import java.util.Scanner;
- public class bt7TongN{
- public static int nhapInt(){
- Scanner n=new Scanner(System.in);
- boolean check =false;
- int a=0;
- while(!check){
- try{
- a=n.nextInt();
- check=true;
- }catch(Exception e){
- System.out.println("Du lieu vao khong dung, nhap lai: ");
- n.nextLine();
- }
- }
- return(a);
- }
- public static void main(String[] args)
- {
- int n=0,s=0;
- System.out.print("Nhap vao gia tri n (nguyen): ");
- n=nhapInt();
- for(int i=1;i<=n;i++)
- s=s+i;
- System.out.println("Tong tu 1 den "+n+" la: "+s);
- }
- }
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