Session 3 Homework - Variables & Data Types

📚 What You'll Practice

This homework focuses on understanding different data types in C programming and how to declare and use variables effectively.

Goal: Master variable declaration, data types, and memory concepts!

📋 Instructions

Understand the difference between int, float, char, and double
Practice declaring variables with meaningful names
Learn about variable initialization
Experiment with different data types
Pay attention to memory usage and data type limits

📝 Program 1: Basic Variable Declaration

Declare and use different data types!

What it does:

Declares variables of different data types, assigns values to them, and displays their values.

#include <stdio.h>

int main() {
    // Integer variables
    int age = 20;
    int year = 2024;
    
    // Float variables
    float height = 5.8;
    float weight = 70.5;
    
    // Character variables
    char grade = 'A';
    char initial = 'R';
    
    // Display all variables
    printf("Age: %d\n", age);
    printf("Year: %d\n", year);
    printf("Height: %.1f feet\n", height);
    printf("Weight: %.1f kg\n", weight);
    printf("Grade: %c\n", grade);
    printf("Initial: %c\n", initial);
    
    return 0;
}

🧪 Expected Output

Age: 20
Year: 2024
Height: 5.8 feet
Weight: 70.5 kg
Grade: A
Initial: R

📊 Program 2: Variable Declaration and Assignment

Declare variables and assign values!

What it does:

Demonstrates how to declare variables of different data types and assign values to them.

#include <stdio.h>

int main() {
    // Integer variables
    int student_id = 12345;
    int age = 20;
    
    // Float variables
    float gpa = 3.8;
    float height = 5.9;
    
    // Character variables
    char grade = 'A';
    char initial = 'R';
    
    // Display all variables
    printf("=== STUDENT RECORD ===\n");
    printf("Student ID: %d\n", student_id);
    printf("Age: %d\n", age);
    printf("GPA: %.2f\n", gpa);
    printf("Height: %.1f feet\n", height);
    printf("Grade: %c\n", grade);
    printf("Initial: %c\n", initial);
    
    return 0;
}

🧪 Expected Output

Student ID: 12345
Age: 20
GPA: 3.80
Height: 5.9 feet
Grade: A
Initial: R

📏 Program 3: Data Type Sizes

Learn about memory usage of different data types!

What it does:

Demonstrates the size of different data types in bytes using sizeof() operator.

#include <stdio.h>

int main() {
    int integer_var;
    float float_var;
    char char_var;
    double double_var;
    
    printf("=== DATA TYPE SIZES ===\n");
    printf("Size of int: %zu bytes\n", sizeof(integer_var));
    printf("Size of float: %zu bytes\n", sizeof(float_var));
    printf("Size of char: %zu bytes\n", sizeof(char_var));
    printf("Size of double: %zu bytes\n", sizeof(double_var));
    
    printf("\n=== DIRECT SIZE CHECK ===\n");
    printf("Size of int: %zu bytes\n", sizeof(int));
    printf("Size of float: %zu bytes\n", sizeof(float));
    printf("Size of char: %zu bytes\n", sizeof(char));
    printf("Size of double: %zu bytes\n", sizeof(double));
    
    return 0;
}

🧪 Expected Output

Shows memory size of each data type (typically: int=4, float=4, char=1, double=8 bytes)

🔢 Program 4: Variable Operations

Perform operations with different data types!

What it does:

Demonstrates how different data types behave in mathematical operations and type conversions.

#include <stdio.h>

int main() {
    int a = 10;
    int b = 3;
    float x = 10.5;
    float y = 3.2;
    
    printf("=== INTEGER OPERATIONS ===\n");
    printf("a = %d, b = %d\n", a, b);
    printf("a + b = %d\n", a + b);
    printf("a - b = %d\n", a - b);
    printf("a * b = %d\n", a * b);
    printf("a / b = %d\n", a / b);
    printf("a %% b = %d\n", a % b);
    
    printf("\n=== FLOAT OPERATIONS ===\n");
    printf("x = %.1f, y = %.1f\n", x, y);
    printf("x + y = %.2f\n", x + y);
    printf("x - y = %.2f\n", x - y);
    printf("x * y = %.2f\n", x * y);
    printf("x / y = %.2f\n", x / y);
    
    printf("\n=== MIXED OPERATIONS ===\n");
    printf("a + x = %.2f\n", a + x);
    printf("x * b = %.2f\n", x * b);
    
    return 0;
}

🧪 Expected Output

Integer operations: 10+3=13, 10-3=7, 10*3=30, 10/3=3, 10%3=1
Float operations: 10.5+3.2=13.70, 10.5-3.2=7.30, etc.
Mixed operations: 10+10.5=20.50, 10.5*3=31.50

🔤 Program 5: Character Operations

Work with characters and ASCII values!

What it does:

Demonstrates character operations, ASCII values, and character arithmetic.

#include <stdio.h>

int main() {
    char letter1 = 'A';
    char letter2 = 'Z';
    char small_a = 'a';
    char digit = '5';
    
    printf("=== CHARACTER INFORMATION ===\n");
    printf("Letter: %c, ASCII: %d\n", letter1, letter1);
    printf("Letter: %c, ASCII: %d\n", letter2, letter2);
    printf("Letter: %c, ASCII: %d\n", small_a, small_a);
    printf("Digit: %c, ASCII: %d\n", digit, digit);
    
    printf("\n=== CHARACTER ARITHMETIC ===\n");
    printf("Next letter after A: %c\n", letter1 + 1);
    printf("Previous letter before Z: %c\n", letter2 - 1);
    printf("Uppercase of 'a': %c\n", small_a - 32);
    printf("Numeric value of '5': %d\n", digit - '0');
    
    return 0;
}

🧪 Expected Output

Character info: A=65, Z=90, a=97, 5=53
Character arithmetic: A+1=B, Z-1=Y, a-32=A, '5'-'0'=5

🏠 Session 3 Homework

Variables & Data Types

📚 What You'll Practice

📋 Instructions

📝 Program 1: Basic Variable Declaration

What it does:

🧪 Expected Output

📊 Program 2: Variable Declaration and Assignment

What it does:

🧪 Expected Output

📏 Program 3: Data Type Sizes

What it does:

🧪 Expected Output

🔢 Program 4: Variable Operations

What it does:

🧪 Expected Output

🔤 Program 5: Character Operations

What it does:

🧪 Expected Output

🎯 Remember