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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.   int i, n, sum = 0;
  8.  
  9.   // read n from the user
  10.  
  11.   cin >> n;
  12.  
  13.   // sum up all numbers <=n that are divisible by 3
  14.  
  15.   for (i = 1; i <= n; i++)
  16.     if (i%3 == 0)
  17.        sum = sum + i;
  18.  
  19.   // print out the sum
  20.  
  21.   cout << "sum is " << sum << endl;
  22.  
  23.   return 0;
  24. }
Success #stdin #stdout 0.01s 2684KB
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stdin
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10
stdout
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sum is 18
https://ideone.com/ZiTsd
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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