Page 456 - ComputerScience_Class_11

Program 1: Simple user input with names.

Program 1.py
File Edit Format Run Options Window Help Output

name = input("Please enter your name: ") Please enter your name: Rohit
print("Hello,", name) Hello, Rohit

Program 2: Write a program to ask the user's favourite colour.

Program 2.py

File Edit Format Run Options Window Help

colour = input("What is your favourite colour? ")
print(colour + " is a beautiful colour!")

Output

What is your favourite colour? Blue
Blue is a beautiful colour!

12.1.2 Getting Numeric Input
When you use the input() function to enter numbers, Python treats the value as a string. It can not be used for
mathematical calculations. If you try to add two numbers entered by the user, Python will join the strings together
instead of performing actual addition.
Program 3: The problem with treating numbers as strings.

Program 3.py
File Edit Format Run Options Window Help

eng = input("Enter marks in English: ")
comp = input("Enter marks in Computer: ")
print("Marks in English and Computer are : ", eng+comp)

Output
Enter marks in English: 25
Enter marks in Computer: 36
Marks in English and Computer are : 2536

To use numbers entered by the user, the input must be converted into a numeric data type. This can be done using the
int() function for whole numbers or the float() function for decimal numbers.

454 Touchpad Computer Science (Ver. 3.0)-XI