C++學習筆記(1)
一、
二、
三、*= 的應用
int main()
{
double price1 = 1234.5;
double price2 = 2345.7;
double price3 = 6453.3;
double total = price1 + price2 + price3;
double discount;
if (total > 10000)
{
discount = 0.7;
}
else
{
discount = 0.5;
}
total *= discount;
cout << "總價格是" << total << endl ;
}
四、從1加到n
int i = 0, s = 0,num=0;
cout << "請輸入數字:" << endl;
cin >> num;
while (i <num )
{
i = i + 1;
s = s + i;
}
cout << "1到" << i << "的和爲" << s << endl;
五、
sum=2;
sum++ - --sum =?
答案:0
符號在前先運算:–sum即 1,同時兩邊的sum都變成1
再算符號在後:sum++ =2,同時右邊的sum變爲2,相減爲0;