20150703
Description
Flashcards by Jacob Slater, updated more than 1 year ago
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Created by Jacob Slater
almost 5 years ago
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| Question | Answer |
| Define a constant and define a variable? | constant: A constant is a memory location used to store a value that cannot be changed whilst the program is running variable: A variable is a memory location used to store a value that can be changed whilst the program is running |
| name and give an example of all data types used in programming? | string:"Hello" integer: "3" floating/real number: "3.5" boolean: "true" character: "K" |
| What is casting? | casting is used to convert one data type into another. For example: int(string variable) this would convert a string into an integer. |
| state common arithmatic operators? | + addition adds two or more values together - subtraction takes the second value from the first value *multiplication multiplies two or more values together /real division divides first value by second value //integer division used to find the quotient(integer number before the decimal point) after division %remainder used to find remainder(modulus) after division **exponential raises the value to the power of the exponential |
| what is the difference between modulus and quotient division? | Modulus division finds the remainder of the sum and quotient division finds the whole number or integer of the sum. |
| What is a sequence and give an example? | A sequence is a pre-determined order carried out into the next one. No action can be skipped in the sequence.Example: cat = input("Enter name of your cat") name = input("Enter you name") print("Your name is",name,"and your cats name is",cat,) |
| What is a selection and give an example? | Selection is an algorithm to choose between two or more options. We use the if the else structure make decisions about which path to follow. Example: Passcode = input("Enter passcode") If passcode =="Go": print("Allow unrestricted access Else: print("Deny all access") |
| what is a iteration and give an example? | Iteration is the process of repeating a set of instructions a fixed number of times or until a condition is met. The two types of loops are: count-controlled-for loops condition controlled-while loops Example: for x in range(1,6) while fruit =="bannanas": |
| define the term string concatenation? | String concatenation is when you join strings together using + sign example: string1 = input("Enter favourite colour") string2 = "cat" newstring = string1+""+string2 print(newstring) |
| What does x.upper() do in python? | x is now all upper case letters |
| what does x.lower() do in python? | x is now all lower case letters |
| what does len(x) do in python? | Calculates the number of characters in a string |
| what does x[index] do in python? | extracts that character from the string starts at 0 example: x = "Hello" print(x[2]) it would print l |
| what does x[a:b] do in python? | extracts string starting at position a and finish at position b. Example: x = "hello" print(x[0:4] it would print hell |
| what does x.substring(a,b) do in javascript? | extracts a string starting at position a with a length of b. Example: x = "hello" print(x.substring(0,2)) this would print he |
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