C Programming – Day 1 | Basics, Structure & First C Program for Beginners

C PROGRAMMING BASIC (INTERACTIVE)

DAY - 1

🎯 Today’s Learning:

1️⃣ Structure of a C Program
2️⃣ printf() & scanf()
3️⃣ Variables + Data Types
4️⃣ Practice Task + Quiz

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✅ 1. Structure of a C Program

#include <stdio.h>   // Header File

int main() {         // Main Function
    // Code goes here
    return 0;
}

✔ Every C program must have main()
✔ #include <stdio.h> allows input & output

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✅ 2. Output: printf()

printf("Hello World!");

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✅ 3. Input: scanf()

int age;
scanf("%d", &age);

📌 Note: Use & before variable name in scanf()

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✅ 4. Variables & Data Types

Data Type	Keyword	Example
Integer	int	10
Float	float	10.5
Character	char	'A'
String	char[]	"Hello"
Double	double	20.123456

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🧪 Example Program (Input + Output)

#include <stdio.h>

int main() {
    char name[20];
    int age;

    printf("Enter your name: ");
    scanf("%s", name);

    printf("Enter your age: ");
    scanf("%d", &age);

    printf("Name: %s\nAge: %d", name, age);

    return 0;
}

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✅ Task 1 (Please Solve)

Write a program that takes:

✔ Your country name (string)
✔ Your year of birth (integer)

Then print like:

Country: Bangladesh
Year of Birth: 2005

You can type your code here — I will check and correct it ✅

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📝 Quick Quiz (Answer in Chat)

1️⃣ Which function is used to take input in C?
A) print()
B) printf()
C) scanf()

2️⃣ Which data type is correct for storing decimal values?
A) int
B) float
C) char

3️⃣ Which line starts input/output system?
A) #include <stdio.h>
B) main()
C) return 0;

Write answers like: 1C, 2B, 3A

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✅ After your task + quiz → I will update Day-1 completed.

Reply with:

➡ Your Task 1 Code
➡ Quiz Answers

✅ NEXT - DAY - 2