C Tutorial

INPUT OUTPUT IN C

Input & Output in C

In C, we use functions from the stdio.h library to take input from the user and display output on the screen.

📘 Key Functions: printf() for output and scanf() for input.

🖨️ Output Using `printf()`

The printf() function is used to display text and variable values.

#include <stdio.h>

int main() {
    printf("Welcome to C Programming!");
    return 0;
}

🎯 Input Using `scanf()`

The scanf() function is used to take input from the user.

#include <stdio.h>

int main() {
    int age;
    printf("Enter your age: ");
    scanf("%d", &age);
    printf("You are %d years old.", age);
    return 0;
}

📌 Format Specifiers

%d → for int
%f → for float
%c → for char
%s → for strings

💡 Note: Always use & (address-of operator) in scanf() for variables.

📝 Try It Yourself

Take input of a user's name and age.
Display: “Hello [Name], you are [Age] years old.”

❌ Common Mistakes

🚫 Forgetting & in scanf()
🚫 Mismatched format specifiers and variable types

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