Inputs

Lesson

As users, we are not making a program.
For the program to behave differently, depending on the user, specific functions exist.
At first, users only had a terminal.
Messages were displayed there, and to navigate through it, they entered special words or numbers as inputs.
Reading from a terminal is an easy way to get an input.
The same as print(), every language has a way to read the input of the user from a terminal.

Example:

myInput = input()

print("The input is:")
print(myInput)

In python, if the input should be a number, you have to make it explicit:

myInput = int(input())

print("The input is:")
print(myInput)

// C++
#include <iostream>

int main()
{
    int myInput;
    std::cin >> myInput;
}

Exercises

Exercise 1

Ask the user a number as an input.
Print that number multiplied by 2.

Exercise 2

Ask the user a number as an input.
Display “Negative” if the number is negative, “Positive” otherwise.