C language - File size

Last update on August 08 2025 12:52:57 (UTC/GMT +8 hours)

19. Find File Size

Write a program in C language to find the size of a given file.

Test Data:
Size of the said File: 34 bytes.

Sample Solution-1:

C Code:

#include <stdlib.h>
#include <stdio.h>

long getFileSize(const char *filename)
{
  long result;
  FILE *fh = fopen("i.txt", "rb");
  fseek(fh, 0, SEEK_END);
  result = ftell(fh);
  fclose(fh);
  return result;
}
int main(void)
{
  printf("Size of the said File: %ld bytes.", getFileSize("input.txt"));
  return 0;
}

Sample Output:

Size of the said File: 34 bytes

Flowchart:

Sample Solution-2:

C Code:

#include <stdlib.h>
#include <stdio.h>

long getFileSize(const char *filename)
{
  long result;
  FILE *fh = fopen("i.txt", "rb");
  fseek(fh, 0, SEEK_END);
  result = ftell(fh);
  fclose(fh);
  return result;
}
int main(void)
{
  printf("Size of the said File: %ld bytes.", getFileSize("input.txt"));
  return 0;
}

Sample Output:

Size of the said File: 34 bytes

Note: This code run on Dev-C++ 5.11

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to compute the size of a file in kilobytes and megabytes and display the result.
Write a C program to compare the sizes of two files and indicate which one is larger.
Write a C program to calculate the size of a file by reading its contents in chunks using a buffer.
Write a C program to determine the size of a binary file and verify it by counting the bytes manually.

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