Code Once, Confused Everywhere!" – A Funny Guide to Programming Basics for DSA

Perfect! Here's a solid structure for your basic programming language course that focuses on universal concepts — ideal for starting DSA. You'll write in C++, and I'll provide syntax comparisons for Java, Python, and JavaScript alongside.

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1. Input / Output

Concept: Taking input from user and displaying output.

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• Code

#include<iostream>
using namespace std;

int main() {
    int x;
    cout << "Enter a number: ";           
    cin >> x;                             
    cout << "Number you have given: " << x << endl; 
    return 0;
}

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2. Variables & Data Types

Concept: Declaring and storing values.

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• Code :

#include <iostream>
using namespace std;

int main() {
    string name;
    int a = 2;
    string b = "ayush basak";
    char c = 'y';
    float pie = 3.14;
    long long pal = 333333333333;

    cout << "Hey you! What's your name? : ";
    getline(cin, name);

    cout << "Collected Variables:\n";
    cout << " Name: " << name << endl;
    cout << "An int (a): " << a << endl;
    cout << "A string (b): " << b << endl;
    cout << "A char (c): " << c << endl;
    cout << "Value of pie (float): " << pie << endl;
    cout << "A long long number: " << pal << endl;

    return 0;
}

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3. Conditionals (if-else)

Concept: Decision making.

if (x > 0) {
    cout << "Positive";
} else {
    cout << "Non-positive";
}

Java: Same syntax
Python:

if x > 0:
    print("Positive")
else:
    print("Non-positive")

JavaScript: Same syntax, but with let and console.log()

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4. Loops (for, while)

Concept: Repetition and iteration.

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• Code :

1. For loop :

#include <iostream>
using namespace std;

int main(){
  int sum = 0;
  for (int i = 0; i < 5; i++)
  {
    sum = sum + i;
  }
  cout << sum;
}

2. While loop :

#include <iostream>
using namespace std;

int main(){
  int i=0;
  int sum = 0;
  while (i<5)
  {
    sum = sum + i;
    i++;
  }
  cout << sum;
}

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5. Arrays / Lists

This not a data structure just the basic to start out DSA.

Concept: Store multiple values.

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• Code :

#include <iostream>
using namespace std;

int main(){
  int a[5] = {1, 2, 3, 4, 5};
  for (int i = 0; i < a[i]; i++)
  {
    cout << a[i]<< endl;
  }
}

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6. Functions

Concept: Reusable code blocks.

int add(int a, int b) {
    return a + b;
}

Java:

static int add(int a, int b) { return a + b; }

Python:

def add(a, b): return a + b

JavaScript:

function add(a, b) { return a + b; }

• Code :

#include <iostream>
using namespace std;

int mul(int a,int b){
  return a * b;
}
int main(){

  int c=mul(2, 3);
  cout << c;
}

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7. String Basics

Concept: Working with characters.

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• Code :

#include <iostream>
using namespace std;

int main(){
  string a = "ayush";
  int b = a.length();
  cout << b;
}

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8. Basic Examples

Print 1 to 5

for (int i = 1; i <= 5; i++) cout << i << " ";

Java: Same
Python: for i in range(1, 6): print(i, end=" ")
JS: for (let i = 1; i <= 5; i++) console.log(i);

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9. Start DSA with These Topics

• Arrays (1D & 2D)

• Strings

• Functions (Recursion)

• Sorting & Searching

• Pointers (in C++)

• STL (vector, set, map) or Collection for Java.

• Classes & OOP Basics

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Final Tip

Focus on concepts, not syntax.
Syntax changes, logic stays.

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Here is the Repo for the Basic of All language that You will need .

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