C Programming – Day 10 | File Handling in C Explained for Beginners

FILE HANDLING IN C

DAY - 10

Learn C Programming Day 10 with a complete guide to file handling in C. Understand how to open, read, write, and close files, and work with text and binary files using clear examples for beginners.

✅ Let’s move to Day-10 — File Handling in C 🚀

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📍 Day-10 — File Handling in C

Today we will learn:

✅ What is a file?
✅ Types of files in C
✅ File operations: open, read, write, close
✅ Reading and writing text files
✅ Task + Quiz

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✅ 1️⃣ What is a File?

📌 A file is a collection of data stored on disk
📌 C allows programs to read/write files

Types:

• Text File → .txt (Human-readable)

• Binary File → .bin (Computer-readable)

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✅ 2️⃣ File Operations in C

1️⃣ Open a file → fopen()

FILE *fp;
fp = fopen("data.txt", "w");  // w=write, r=read, a=append

2️⃣ Write to a file → fprintf() or fputs()

fprintf(fp, "Hello File\n");

3️⃣ Read from a file → fscanf() or fgets()

char str[50];
fgets(str, 50, fp);

4️⃣ Close the file → fclose()

fclose(fp);

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✅ 3️⃣ Example — Write & Read File

#include <stdio.h>

int main() {
    FILE *fp;
    char name[30];

    // Write
    fp = fopen("student.txt", "w");
    printf("Enter your name: ");
    scanf("%s", name);
    fprintf(fp, "Name: %s\n", name);
    fclose(fp);

    // Read
    fp = fopen("student.txt", "r");
    char line[50];
    fgets(line, 50, fp);
    printf("File Content: %s", line);
    fclose(fp);

    return 0;
}

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✅ 4️⃣ File Modes in C

Mode	Meaning
r	Read only
w	Write only (overwrite)
a	Append
r+	Read & write
w+	Write & read (overwrite)
a+	Append & read

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✅ Task-10

Write a program:

✔ Create a file marks.txt
✔ Input marks of 3 students
✔ Write marks to file
✔ Read from the file and display on screen

Example Output:

Student 1 Marks: 88
Student 2 Marks: 92
Student 3 Marks: 79

📌 Hint: Use fprintf() for writing and fscanf() or fgets() for reading

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📝 Quick Quiz — Day-10

Reply like: 1C, 2B, 3A

1️⃣ Function to open a file:
A) fopenfile()
B) open()
C) fopen()

2️⃣ Mode to append text to a file:
A) w
B) a
C) r

3️⃣ Function to close a file:
A) fclose()
B) closefile()
C) endfile()

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📌 Reminder:

Send your Task-10 Code and Day-10 Quiz Answers when ready!

Then we will proceed to Day-11: Dynamic Memory Allocation in C 💪

✅ NEXT - DAY - 11

C Programming Day 10 teaches file handling in C, including reading, writing, and managing files. Learn how to work with text and binary files using file pointers and standard C functions for beginner-friendly examples.