擅长:python、mysql、java
<p>试试这个。</p>
<pre><code>#include <iostream>
using namespace std;
int main()
{
int num;
int sum;
int i;
sum = 0;
cout << "Please enter a positive integer: ";
cin >> num;
for (i=0; i < num; i++)
{
sum = sum + i;
cout << i << " + ";
}
cout <<num << " = " << sum+num << endl;
return 0;
}
</code></pre>