Demo program for Week 1, CS31 Fall 2021 Discussion 1C

week1.cpp

/* Demo program for CS31 Discussion 1C Week 1
   Oct 1, 2021, Mingyu Derek Ma
*/


#include <iostream>
using namespace std;

int main()
{
    // Example 1: basic cout usage
    int thisYear = 2021;
    string thisMonth = "October";
    cout << "hello" << endl;
    cout << "This year is " << thisYear << ", and this month is " << thisMonth << ". \n";
    
    // Example 2, precision control
    double exampleFloat = 3.1415926; // define a double variable
    cout << exampleFloat << endl;
    cout.setf(ios::fixed);
    cout << exampleFloat << endl;
    cout.setf(ios::showpoint);
    cout << exampleFloat << endl;
    cout.precision(2);
    cout << exampleFloat << endl;
    cout.precision(7);
    cout << exampleFloat << endl;
    cout.precision(15);
    cout << exampleFloat << endl;
    
    // Example 3, receiving input from console
    int dateNum = 0;
    int hourNum = 0;
    cout << "Please input date: ";
    cin >> dateNum;
    cout << "Please input date and then input hour: ";
    cin >> dateNum >> hourNum;
    cout << "The dateNum is " << dateNum << ", and the hourNum is " << hourNum << ". \n";
    
    // Example 4, bit overflow example
    int a = 2147483647;
    a = a + 1;
    cout << a;
}