This content originally appeared on DEV Community and was authored by Munin Borah
🖥️ What I Learned
1. Float Data Type
-
floatis used for decimal numbers (like 3.14, 0.99, -12.5). - Compared to
int, floats allow precision, but not always exact precision (because computers store them in binary).
Example:
float pi = 3.14;
cout << pi << endl; // prints 3.14
👉 Key insight: Use float (or even better, double) when you need fractional values. Use int when you only need whole numbers.
2. Increment (++) and Decrement (--) Operators
These operators let you quickly increase or decrease a variable’s value by 1.
-
Increment:
x++is the same asx = x + 1 -
Decrement:
x--is the same asx = x - 1
There are two types:
-
Post-increment (
x++) → use the current value, then increase. -
Pre-increment (
++x) → increase first, then use the new value.
Example:
int x = 5;
cout << x++ << endl; // prints 5, then x becomes 6
cout << ++x << endl; // x becomes 7 first, then prints 7
👉 Key insight: If you just want to add/subtract, both work. But if you’re using it in a more complex expression, pre vs post matters.
đź’» Example Code
#include <iostream>
using namespace std;
int main() {
// Working with float
float price = 9.99;
cout << "Price: " << price << endl;
// Increment & Decrement
int counter = 10;
cout << "Counter: " << counter << endl; // 10
counter++; // increase by 1
cout << "After counter++: " << counter << endl; // 11
counter--; // decrease by 1
cout << "After counter--: " << counter << endl; // 10
// Pre vs Post increment
cout << "Post-increment: " << counter++ << endl; // prints 10, then counter = 11
cout << "Pre-increment: " << ++counter << endl; // counter = 12, then prints 12
return 0;
}
🔑 Takeaway
- Float vs Int: Use float for decimals, int for whole numbers.
- Increment & Decrement: Shortcuts for adding/subtracting 1.
- Pre vs Post increment: Order matters only when used inside expressions.
At the start, it felt tough, but it’s getting smoother now. Learning may be slow, but consistency wins the game.
#100DaysOfCode #LearnInPublic #CodeNewbie #C++ #CodingChallenge #Programming
This content originally appeared on DEV Community and was authored by Munin Borah
Munin Borah | Sciencx (2025-08-19T01:50:33+00:00) Day 4 / 100 (C++). Retrieved from https://www.scien.cx/2025/08/19/day-4-100-c/
Please log in to upload a file.
There are no updates yet.
Click the Upload button above to add an update.