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  1. #include <iostream>
  2. #include <stdlib.h>
  3.  
  4. using namespace std;
  5.  
  6. int main(){
  7.     system("cls");
  8.     int n, tong;
  9.  
  10.     cout << "Moi ban nhap vao n: ";
  11.     cin >> n;
  12.         tong = 0;
  13.         for (int i = 0; i <= n; i++)
  14.         {
  15.             tong = tong + i;
  16.         }
  17.         cout << "Tong cua day so la: " << tong << endl;
  18.     return 0;
  19.  
  20. }
Success #stdin #stdout #stderr 0.01s 5304KB
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stdin
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Standard input is empty
stdout
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Moi ban nhap vao n: Tong cua day so la: 536756230
stderr
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sh: 1: cls: not found
https://ideone.com/ZacDx7
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language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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