# Python input and output exercises, arithmetic exercises, turtle preliminary exercises

Source: Internet
Author: User
Tags arithmetic

Hello world!

`Print ("Hello Word")`

Simple Interactive (interactive, file-style) textbook P19

The user enters two numbers and calculates and outputs the sum of two digits:

`N1=input ("1") n2=input ("2:")Print (Float (N1) +float (n2))`

The user enters the triangular three-side length and calculates the area of the triangle: (Helen Formula)

`A = float (input ('input triangle First side length:')) b= Float (Input ('input Triangle Second side length:')) C= Float (Input ('input triangle Third side length:'))#Calculate half Perimeters = (A + B + c)/2Print('triangular half-perimeter is%0.2f'%s)#calculate area with Helen Formula S=√[p (P-A) (p-b) (p-c)]{a,b,c for edge length, p for half perimeter = (a+b+c)/2}Area = (s* (s-a) * (s-b) * (S-C)) * * 0.5Print('triangular area of%0.2f'%area)`

Enter a radius to calculate the area of the circle.

`pi=3.14= float (input ("))#  calculates the area of the circle areas = pi*r*r  Print(' Circle area of%0.2f' %area)`

Draw a set of identical tangent circles

`Import turtleturtle.circle (turtle.circle)turtle.circle(\$)turtle.circle (100 )`

Draw a Pentagram

`Import turtleturtle.hideturtle () turtle.speed()Turtle.begin_fill ()  for  in range (5):        turtle.forward (    turtle.left(144) Turtle.end_fill ( )`

Draw an all-yellow pentagram

`Import turtleturtle.hideturtle () turtle.speed()turtle.color ("green" ) ) Turtle.fillcolor ("green") Turtle.begin_fill ()for in Range (5):        turtle.forward (+)    turtle.left (144) Turtle.end_fill () `

Python input and output exercises, arithmetic exercises, turtle preliminary exercises

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