An integer is a numeric data type that represents whole numbers, with no decimal part —such as -5, 0 or 128—. In programming it is used to count, repeat actions and number positions exactly.
Every language sets aside a piece of memory to store integers. Unlike other numbers, an integer never has a decimal point: 7 is an integer, but 7.0 is not. Integers can be positive, negative or zero, and they are the foundation of almost any program that counts or repeats something.
Integer vs Other Types
An integer differs from two close types: the float, which does store decimals like 3.14, and the string, which stores text inside quotes like "42". The number 42 and the text "42" look alike, but the computer treats them differently: with the integer it can add, with the string it cannot.
In Scratch, when a child uses the "repeat 10 times" block, that 10 is an integer. In Python, age = 9 creates an integer, while age = 9.5 creates a float and age = "9" creates a string. A fun fact: in many languages, dividing two integers like 7 / 2 can give 3 instead of 3.5, because the result is trimmed to the nearest integer.
Why It Matters for Kids
Understanding data types helps children avoid common mistakes, like trying to add text to a number. It is one of the first concepts practiced in Algonova coding courses, together with what is a variable.
Want your child to practice it live? Book a free class and give it a try.
