Appending to a File

#include <stdio.h>

int main() {
  FILE *filePtr;

  // Open the file in append mode ("a")
  filePtr = fopen("sample.txt", "a");

  // Check if the file opened successfully
  if (filePtr == NULL) {
    printf("Error! Could not open file.\n");
    return 1;
  }

  // Append data to the file
  fprintf(filePtr, "Appending this line to the file.\n");

  // Close the file
  fclose(filePtr);

  printf("Data appended to the file successfully.\n");

  return 0;
}

This program appends a new line of text to the existing sample.txt file.

Explanation:

"a" mode ensures that new data is added to the end of the file without overwriting existing content.

Problem Solving using C Language

File Handling

Appending to a File

Explanation: