Forem: Suman Samanta

Day 4 of #100DaysOfCode

Suman Samanta — Sun, 13 Jul 2025 02:17:25 +0000

Today I Learned (Pointers in C++)

Understood memory concepts: how variables are stored in RAM
Learned about the address-of operator (&) and how to use pointers (*)
Explored dereferencing, null pointers, and their use cases
Differentiated pass-by-value vs pass-by-reference
Practiced with reference variables and how they differ from pointers

#include <iostream>
using namespace std;

void passByValue(int x) {
    x = x + 10;
}

void passByReference(int &x) {
    x = x + 10;
}

int main() {
    int a = 5;
    int* ptr = &a;  // pointer to a
    int* nullPtr = nullptr;  // null pointer

    cout << "Address of a: " << &a << endl;
    cout << "Value of ptr: " << ptr << endl;
    cout << "Value pointed by ptr: " << *ptr << endl;

    int val = 100;
    passByValue(val);
    cout << "After passByValue: " << val << endl;

    passByReference(val);
    cout << "After passByReference: " << val << endl;

    int &ref = a;
    ref += 20;
    cout << "\nReference variable updated a to: " << a << endl;

    return 0;
}

Takeaway

Pointers are powerful tools for understanding how memory works.

Codes: https://github.com/GeekyProgrammer07/DSA

Day 3 of #100DaysOfCode

Suman Samanta — Sun, 06 Jul 2025 09:33:32 +0000

Today I Learned (Functions + Binary Numbers in C++)

Revisited functions in C++: syntax, parameters, return types
Explored local vs global scope and function overloading
Practiced:
- Factorial using functions
- isPrime(int) returning true/false
- Binomial Coefficient calculation
- Found all primes in a range
Dived into the Binary Number System
- Decimal → Binary conversion
- Binary → Decimal conversion
Learned about data type modifiers: signed, unsigned, short, long, long long

Wrote clean code for binary ↔ decimal conversions

Takeaway

Functions simplify logic, and binary concepts strengthen core understanding.

Codes: https://github.com/GeekyProgrammer07/DSA

Day 2 of #100DaysOfCode

Suman Samanta — Sat, 05 Jul 2025 10:05:09 +0000

Today I Learned (C++ Patterns with Loops)

Practiced drawing patterns using for and while loops in C++. Used nested loops to control rows & columns

Drew 8+ different * patterns including:

Star
Inverted Star
Half Pyramid
Diamond
Floyd's Triangle
Butterfly

Takeaway

Mastering nested loops unlocks control over logic.

Codes: https://github.com/GeekyProgrammer07/DSA

Day 1 of #100DaysOfCode

Suman Samanta — Fri, 04 Jul 2025 18:23:43 +0000

Today I Learned (C++ Basics Recap)

Set up a personal C++ boilerplate in VS Code for faster coding
Explored data types, variable naming, and preprocessor directives
Learned about namespace std and why it's used
Covered:
- Constants, implicit/explicit typecasting
- Arithmetic, unary, relational, logical operators
- if, else, switch, ternary ops
- Loops (while, for, do-while), break & continue
Practiced: sum of n numbers, prime check

Takeaway

A clean setup and strong basics make everything smoother.

Codes: https://github.com/GeekyProgrammer07/DSA

"C++ Boilerplate": {
        "prefix": "cppboiler",
        "body": [
            "#include <iostream>",
            "using namespace std;",
            "",
            "int main() {",
            "    $1",
            "    return 0;",
            "}"
        ],
        "description": "Basic C++ boilerplate with fast IO"
    },
    "Input 1 variable": {
        "prefix": "enterInput",
        "body": [
            "int n;",
            "cout << \"Enter the number: \";",
            "cin >> n;",
            "$1"
        ],
        "description": "Basic C++ boilerplate to take input of 1 number"
    }