How to put string into the file and how to read string from the file in c

Working with Strings in Files in C

Putting a String into a File

1. Open the File: Use fopen() to open the file in the desired mode (e.g., write mode "w" for putting data into the file).
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   FILE *filePointer;
   filePointer = fopen("example.txt", "w");
   

2. Write String to File: Use fprintf() to write a string to the file.

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   fprintf(filePointer, "Hello, this is a sample string.");

3. Close the File: Always close the file after writing.

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   fclose(filePointer);

Reading a String from a File

1. Open the File: Use fopen() to open the file in the desired mode (e.g., read mode "r").

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   FILE *filePointer;
   filePointer = fopen("example.txt", "r");

    

2. Read String from File: Use fscanf() to read a string from the file.

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   char buffer[100]; // Assuming a maximum string length of 100
   fscanf(filePointer, "%s", buffer);

    

3. Close the File: Always close the file after reading.

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   fclose(filePointer);
   

Putting a string into a file:

FILE *filePointer;
filePointer = fopen("example.txt", "w");

fprintf(filePointer, "Hello, this is a sample string.");

fclose(filePointer);

Reading a string from a file:

FILE *filePointer;
filePointer = fopen("example.txt", "r");

char buffer[100];
fscanf(filePointer, "%s", buffer);

fclose(filePointer);

File Operations in C: Writing and Reading Strings

#include <stdio.h>

int main() {
    FILE *filePointer;
    char textToWrite[100]; // Assuming a string of up to 100 characters
    char buffer[100]; // Assuming a buffer of up to 100 characters

    // Putting a String into a File
    filePointer = fopen("example.txt", "w");

    if (filePointer == NULL) {
        printf("Error opening file for writing.\n");
        return -1; // Return an error code
    }

    printf("Enter a string to write to the file: ");
    gets(textToWrite); // Note: gets() is used for simplicity, not recommended in real code

    fprintf(filePointer, "%s", textToWrite);

    fclose(filePointer);

    // Reading a String from a File
    filePointer = fopen("example.txt", "r");

    if (filePointer == NULL) {
        printf("Error opening file for reading.\n");
        return -1; // Return an error code
    }

    fgets(buffer, sizeof(buffer), filePointer);

    fclose(filePointer);

    printf("String read from file: %s", buffer);

    return 0;
}

Enter a string to write to the file: Hello, World!
String read from file: Hello, World!

Conclusion:

• You've learned how to put a string into a file and how to read a string from a file in C.
• These file I/O operations are fundamental for many real-world applications.

Note:

• Error handling is crucial when working with files in C. Always check the return values of file-related functions for errors.
• Ensure that you have the necessary permissions to access and modify the file you're working with.

Further Reading:

• [fputs and fgets in c]
• [fprintf and fscanf in c]

For further information and examples, Please visit[ C-Programming From Scratch to Advanced 2023-2024]

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