ios / % 四舍五入 向上取整(ceil()) 向下取整(floor())
2016-04-15 13:37
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1. / //Test "/" cout << "Test \"/\"!" << endl; cout << "7 / 2 = " << 7/2 << endl; //3 cout << "7 / 2.0 = " << 7/2.0 << endl; //3.5 cout << "7.0 / 2 = " << 7.0/2 << endl; //3.5 cout << "7.0 / 2.0 = " << 7.0/2.0 << endl; //3.5 cout << "7 / 3 = " << 7/3 << endl; //2 cout << endl; 2. % //Test "%" cout << "Test \"%\"!" << endl; cout << "9 % 3 = " << 9%3 << endl; //0 cout << "9 % 4 = " << 9%4 << endl; //1 //cout << "9.0 % 3 = " << 9.0%3 << endl; //cout << "9 % 3.0 = " << 9%3.0 << endl; cout << endl; 3. 四舍五入 //Test round() cout << "Test \"四舍五入\"!" << endl; double dRoundA = 1.4; double dRoundB = 1.6; double dRoundLowA = -1.4; double dRoundLowB = -1.6; double dRoundLowC = 0.0; cout << dRoundA << " = " << RoundEx(dRoundA) << endl; //1 cout << dRoundB << " = " << RoundEx(dRoundB) << endl; //2 cout << dRoundLowA << " = " << RoundEx(dRoundLowA) << endl; //-1 cout << dRoundLowB << " = " << RoundEx(dRoundLowB) << endl; //-2 cout << dRoundLowC << " = " << RoundEx(dRoundLowC) << endl; //0 cout << endl; double RoundEx(const double& dInput) { double dIn = dInput; if (dInput >= 0.0) //??? { return int(dIn + 0.5); } else { return int(dIn - 0.5); } } 4. ceil() 向上取整 //Test ceil() 向上取整 cout << "Test ceil() 向上取整!" << endl; cout << "ceil 1.2 = " << ceil(1.2) << endl; //2 cout << "ceil 1.8 = " << ceil(1.8) << endl; //2 cout << "ceil -1.2 = " << ceil(-1.2) << endl; //-1 cout << "ceil -1.8 = " << ceil(-1.8) << endl; //-1 cout << "ceil 0.0 = " << ceil(0.0) << endl; //0 cout << endl; 5. floor() 向下取整 //Test floor() 向下取整 cout << "Test floor() 向下取整!" << endl; cout << "floor 1.2 = " << floor(1.2) << endl; //1 cout << "floor 1.8 = " << floor(1.8) << endl; //1 cout << "floor -1.2 = " << floor(-1.2) << endl; //-2 cout << "floor -1.8 = " << floor(-1.8) << endl; //-2 cout << "floor 0.0 = " << floor(0.0) << endl; //0 cout << endl; |
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