2. C Operators, Decision Making & Iteration Loops

Module 1: C Operators & Bitwise Manipulations

Operators execute arithmetic, logical, and bit-level calculations on variables.

🇬🇧 English Definition

Operators are symbols that inform the compiler to perform specific mathematical, logical, or bitwise operations on operands.

🇮🇳 Hinglish Definition

Operators wo special symbols hote hai jo data par calculation ya comparison perform karte hai (jaise +, -, &&, ||, &, |).

Core Concepts & Rules

Arithmetic: +, -, *, /, % (Modulus returns integer remainder).
Relational: ==, !=, >, <, >=, <=.
Logical: && (AND), || (OR), ! (NOT).
Bitwise: & (Bitwise AND), | (Bitwise OR), ^ (XOR), ~ (NOT), << (Left Shift), >> (Right Shift).

🔍 Line-by-Line Code Breakdown

Line 2-3: Initialize int a = 12 (1100 in binary), b = 5 (0101 in binary).
Line 4: a & b yields 4 (0100 in binary).
Line 5: a | b yields 13 (1101 in binary).
Line 6: a << 1 left shifts bits by 1 (multiplies 12 * 2 = 24).

💻 Practical C Code Example - C Operators & Bitwise Manipulations

int main() {
    int a = 12, b = 5;
    printf("Bitwise AND (a & b): %d\n", a & b);
    printf("Bitwise OR  (a | b): %d\n", a | b);
    printf("Left Shift  (a << 1): %d\n", a << 1);
    return 0;
}

📤 Compiled Program Output:

Bitwise AND (a & b): 4 Bitwise OR (a | b): 13 Left Shift (a << 1): 24

Module 2: Control Flow: if-else Ladder & switch case

Directing execution paths based on Boolean condition evaluations.

🇬🇧 English Definition

Control Flow structures evaluate conditions to determine which code blocks are executed or skipped during runtime.

🇮🇳 Hinglish Definition

Control Flow se hum tay karte hai ki kaunsa code kab chalega, jaise if-else se condition match hone par aage badhna.

Core Concepts & Rules

if-else ladder checks conditions sequentially.
switch case matches integral/char expressions against case constants.
break statement is mandatory in switch cases to prevent fall-through.

🔍 Line-by-Line Code Breakdown

Line 2: Set char code = 'B'.
Line 3-9: Switch statement checks code matching case 'A' or 'B'.
Line 6: Case 'B' matches -> prints 'Grade B: Good Effort' and breaks out of switch.

💻 Practical C Code Example - Control Flow: if-else Ladder & switch case

int main() {
    char code = 'B';
    switch (code) {
        case 'A':
            printf("Grade A: Excellent!\n");
            break;
        case 'B':
            printf("Grade B: Good Effort by Instructor Student!\n");
            break;
        default:
            printf("Grade Other\n");
    }
    return 0;
}

📤 Compiled Program Output:

Grade B: Good Effort by Instructor Student!

Module 3: Iteration Loops: for, while & do-while

Repeating code blocks until termination condition turns false.

🇬🇧 English Definition

Loops execute a block of statements repeatedly as long as a specified condition remains true.

🇮🇳 Hinglish Definition

Loop ek hi task ko baar-baar repeat karne me kaam aata hai. for loop counter ke liye aur while condition ke liye best hota hai.

Core Concepts & Rules

for loop: for (initialization; condition; increment/decrement).
while loop: Entry-controlled loop; checks condition before execution.
do-while loop: Exit-controlled loop; executes code at least ONCE even if condition is false.

🔍 Line-by-Line Code Breakdown

Line 2-4: for loop initializes i=1, runs while i<=3, increments i after each iteration.
Line 3: Prints current loop counter value.

💻 Practical C Code Example - Iteration Loops: for, while & do-while

int main() {
    int i;
    for (i = 1; i <= 3; i++) {
        printf("Iteration Count: %d\n", i);
    }
    return 0;
}

📤 Compiled Program Output:

Iteration Count: 1 Iteration Count: 2 Iteration Count: 3