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fputc in C Programming

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The C fputc function is useful to write the character(s) to the specified stream at the current position in a file and then advanced the pointer position.

How to write the character, or character array (string), or string data to a File using fputc in C Programming with example?. Use the fputs function to write the complete string.

TIP: You have to include the #include<stdio.h> header before using this fputc function.

Syntax of fputc in C Programming

The syntax behind the fputc in C Programming language is as shown below.

int fputc(int char, FILE *stream)

or we can simply write it as:

int fputc(int char, <File Pointer>)

From the above fputc function code snippet,

  • char: Please specify the character(s) you want to write to the file
  • stream: Please specify the pointer to a FILE object, or say, file pointer that holds the file address and the operation mode

We are going to use the following specified file to demonstrate this C fputc function.

FPUTC in C Programming 1

From the above screenshot, you can observe that the sample.txt file is in our Documents folder and it is empty.

fputc in C Programming Example

The C fputc function used to write the character(s) to the user-specified file. This C program will help you to understand the same.

// C fputc function example

#include <stdio.h> 
#include<string.h>

int main()
{
   FILE *fileAddress;
   fileAddress = fopen("sample.txt", "w");
   char name[50] = "Tutorial Gateway";
   int i;
   int len = strlen(name);

   if (fileAddress != NULL) {
	for (i = 0; i < len; i++) {
           printf("Character we ar writing to the File = %c \n", name[i]);
	   // Let us use our fputc
	   fputc (name[i], fileAddress);
	}
	printf("\n We have written the Name successfully");
	fclose(fileAddress);		
   }
   else {
  	  printf("\n Unable to Create or Open the Sample.txt File");
   }
   return 0;
}

OUTPUT

FPUTC in C Programming 3

ANALYSIS

Within this C fputc function example, First, we created the File pointer and then assigned the file in write mode.

TIP: Here, we haven’t mentioned the full path of file name because my .c application and the text file reside in the same location. If your scenario is different, then please provide the full path.

FILE *fileAddress;
fileAddress = fopen("sample.txt", "w");

Next, we used the strlen function to find the string length

int len = strlen(name);

The following If Statement will check whether we successfully opened the specified file or not.

if (fileAddress != NULL) {

Next, we used the For Loop to traverse every character present in the name array

for (i = 0; i < len; i++) {

Next, we used the C fputc function to write each character present in the name array to the sample.txt file

fputc (name[i], fileAddress);

Here, we are closing the file pointer.

fclose(fileAddress);

Let us open the File to see whether we successfully returned the characters or not

FPUTC in C Programming 4