2016校招编程题<四>

    编写函数Sum(n) = 1+2+3+4+5+6+·····+n;

<span style="font-size:18px;">int Sum(int n){int sum = 0;if(n <= 0)return sum;for(int i = 1; i < = n; i++){sum = sum + i;}if(sum < 0){cout << “error” << endl; // 超越整型的范围。return 0;}return sum;}</span>