https://codeperfectplus.com/30-days-of-code-hackerrank-day-1

day1_30_days_of_code.cpp

#include <iostream>
#include <iomanip>
#include <limits>

using namespace std;

int main() {
    int i = 4;
    double d = 4.0;
    string s = "HackerRank ";

    
    // Declare second integer, double, and String variables.
    int i2;
    double d2;
    string s2;
    // Read and save an integer, double, and String to your variables.
    // Note: If you have trouble reading the entire string, please go back and review the Tutorial closely.
    cin >> i2;
    cin >> d2;
    cin.get();
    getline(cin, s2);
    // Print the sum of both integer variables on a new line.
    cout << i+i2 << endl;
    // Print the sum of the double variables on a new line.    
    cout<< std::fixed <<std::setprecision(1)<< d + d2 << endl;
    // Concatenate and print the String variables on a new line
    cout << s << s2;
    // The 's' variable above should be printed first.

    return 0;