int sum = 0;
while (n > 0){
sum = sum + n;
n -= 1;
}
......我是直接把上面的公式写上了 sum = (1 + n) * n / 2;
我也觉得是sum = (1 + n) * n / 2; 哈哈哈，应该还用不到while
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苯叽
int sum = 0;
while (n > 0){
sum = sum + n;
n -= 1;
}