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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,i;
  9.  
  10.     cout << "Moi ban nhap vao n: ";
  11.     cin >> n;
  12.         tong = 0;
  13.         // for (int i = 0; i <= n; i++)
  14.         // {
  15.         //     if(i % 2 == 0){
  16.         //         tong += i;
  17.         //     }
  18.         // }
  19.         // cout << "Tong cua day so la: " << tong << endl;
  20.         if(i % 2 != 0){
  21.             i++;
  22.         }
  23.         for (int i = 0; i <= n; i += 2)
  24.         {
  25.             tong += i;
  26.         }
  27.         cout << "Tong cua so chan: " << tong << endl;
  28.     return 0;
  29.  
  30. }
Success #stdin #stdout #stderr 0.01s 5272KB
comments (?)
stdin
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Standard input is empty
stdout
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Moi ban nhap vao n: Tong cua so chan: 268419072
stderr
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sh: 1: cls: not found
https://ideone.com/UHt3t6
Tính tổng các số chẵn ( for )
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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