Session 2 Homework - printf() & scanf()

📚 What You'll Practice

This homework focuses on mastering printf() for output and scanf() for input. You'll learn format specifiers and create interactive programs.

Goal: Become comfortable with input/output operations in C programming!

📋 Instructions

Type each program carefully in Code::Blocks
Test with different input values
Pay attention to format specifiers (%d, %f, %c, %s)
Make sure you understand the difference between printf() and scanf()
Experiment with different format specifiers

📝 Program 1: Basic Input/Output

Get input from user and display it!

What it does:

Asks the user to enter their name and age, then displays the information back to them.

#include <stdio.h>

int main() {
    int age;
    char name[50];
    
    printf("Enter your name: ");
    scanf("%s", name);
    
    printf("Enter your age: ");
    scanf("%d", &age);
    
    printf("Hello %s! You are %d years old.\n", name, age);
    
    return 0;
}

🧪 Test Cases

Input: Rahul, 20 → "Hello Rahul! You are 20 years old."
Input: Priya, 18 → "Hello Priya! You are 18 years old."

🧮 Program 2: Number Calculator

Get two numbers and display them!

What it does:

Asks for two numbers and displays them in a formatted way.

#include <stdio.h>

int main() {
    int num1, num2;
    
    printf("Enter first number: ");
    scanf("%d", &num1);
    
    printf("Enter second number: ");
    scanf("%d", &num2);
    
    printf("First number: %d\n", num1);
    printf("Second number: %d\n", num2);
    printf("You entered: %d and %d\n", num1, num2);
    
    return 0;
}

🧪 Test Cases

Input: 10, 20 → Shows both numbers separately and together
Input: 5, 15 → Shows both numbers separately and together

🔤 Program 3: Character Input

Work with single characters!

What it does:

Gets a single character from the user and displays it along with its ASCII value.

#include <stdio.h>

int main() {
    char letter;
    
    printf("Enter a character: ");
    scanf(" %c", &letter);
    
    printf("You entered: %c\n", letter);
    printf("ASCII value: %d\n", letter);
    
    return 0;
}

🧪 Test Cases

Input: A → "You entered: A, ASCII value: 65"
Input: z → "You entered: z, ASCII value: 122"
Input: 5 → "You entered: 5, ASCII value: 53"

🔢 Program 4: Float Numbers

Work with decimal numbers!

What it does:

Gets a decimal number from the user and displays it with different decimal places.

#include <stdio.h>

int main() {
    float number;
    
    printf("Enter a decimal number: ");
    scanf("%f", &number);
    
    printf("You entered: %f\n", number);
    printf("With 2 decimal places: %.2f\n", number);
    printf("With 1 decimal place: %.1f\n", number);
    
    return 0;
}

🧪 Test Cases

Input: 3.14159 → Shows number with different decimal places
Input: 2.5 → Shows number with different decimal places

📋 Program 5: Student Information Form

Create a complete information form!

What it does:

Creates a student information form that collects name, age, grade, and displays all information in a formatted way.

#include <stdio.h>

int main() {
    char name[50];
    int age;
    char grade;
    float gpa;
    
    printf("=== STUDENT INFORMATION FORM ===\n");
    printf("Enter your name: ");
    scanf("%s", name);
    
    printf("Enter your age: ");
    scanf("%d", &age);
    
    printf("Enter your grade (A/B/C/D/F): ");
    scanf(" %c", &grade);
    
    printf("Enter your GPA: ");
    scanf("%f", &gpa);
    
    printf("\n=== STUDENT DETAILS ===\n");
    printf("Name: %s\n", name);
    printf("Age: %d\n", age);
    printf("Grade: %c\n", grade);
    printf("GPA: %.2f\n", gpa);
    
    return 0;
}

🧪 Test Cases

Input: Rahul, 20, A, 3.8 → Complete student information display
Input: Priya, 19, B, 3.2 → Complete student information display

🏠 Session 2 Homework

printf() & scanf() Functions

📚 What You'll Practice

📋 Instructions

📝 Program 1: Basic Input/Output

What it does:

🧪 Test Cases

🧮 Program 2: Number Calculator

What it does:

🧪 Test Cases

🔤 Program 3: Character Input

What it does:

🧪 Test Cases

🔢 Program 4: Float Numbers

What it does:

🧪 Test Cases

📋 Program 5: Student Information Form

What it does:

🧪 Test Cases

🎯 Remember