Variables, Data Types & I/O - Concepts

Introduction to Variables, Data Types & I/O

Key Concepts

• Understanding the core principles of variables, data types & i/o
• Practical applications and real-world use cases
• Step-by-step implementation guides
• Common patterns and best practices
• Tips for debugging and troubleshooting
• Performance optimization techniques

Variables, Data Types & I/O - Code Example

#include <stdio.h>

int main() {
    int age = 25;
    float salary = 55000.50;
    char grade = 'A';
    char name[50] = "Alice";

    printf("Name: %s\n", name);
    printf("Age: %d\n", age);
    printf("Salary: %.2f\n", salary);
    printf("Grade: %c\n", grade);

    // Input
    printf("Enter your age: ");
    scanf("%d", &age);
    printf("You are %d years old\n", age);
    return 0;
}

Try It Yourself: Variables, Data Types & I/O

#include <stdio.h>

int main() {
    char name[50];
    int age;
    
    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);
    printf("In 10 years you will be %d.\n", age + 10);
    return 0;
}

Quick Quiz: Variables, Data Types & I/O