Day 3 / 100 (C++)

🖥️ What I Learned

1. Basic Arithmetic Operators

C++ gives us standard math operators:

• + → addition
• - → subtraction
• * → multiplication
• / → division
• % → modulus (remainder)

---

2. Integers vs Floats

Here’s where it gets interesting:

• Integers (int) only store whole numbers. If you divide two integers, you get an integer result (the decimal part is cut off).

  cout << 7 / 2;  // prints 3, not 3.5

• Floats (float or double) can store decimals. If at least one number is a float, you’ll get a more precise result:

  cout << 7.0 / 2;   // prints 3.5
  cout << 7 / 2.0;   // also prints 3.5

👉 Key insight: The type of your variables changes the type of your results.

---

3. The Modulus Operator %

• % only works with integers.
• It gives the remainder after division.

  cout << 7 % 2;  // prints 1 (since 7 = 2*3 + 1)
  cout << 10 % 3; // prints 1

This is super useful for things like checking if a number is even:

if (x % 2 == 0) {
    cout << "Even";
} else {
    cout << "Odd";
}

---

💻 Example Code

#include <iostream>
using namespace std;

int main() {
    int a = 7, b = 2;
    float c = 7.0, d = 2.0;

    // Integer operations
    cout << "Integer addition: " << a + b << endl;
    cout << "Integer division: " << a / b << endl;   // 3

    // Float operations
    cout << "Float division: " << c / d << endl;     // 3.5

    // Modulus
    cout << "Modulus (remainder): " << a % b << endl; // 1

    return 0;
}

---

🔑 Takeaway

• Integers cut off decimals when dividing.
• Floats keep decimals for more accurate results.
• Modulus (%) gives the remainder and only works with integers.

---

just smile 🌝, and start coding!
#100DaysOfCode #LearnInPublic #CodeNewbie #C++ #CodingChallenge #Programming

---