fputc C Library Function

The function int fputc(int character, FILE *stream); writes a character to the given stream and increment the internal position indicator by one.

Function prototype of fputc

int fputc(int character, FILE *stream);

• character : This is the character to be written.
• stream : A pointer to a FILE object which identifies a stream where we want to write a character.

Return value of fputc

This function returns the character written in stream, on success. If an error occurs, EOF is returned and the error indicator is set.

C program to show the use of fputc function

The following program shows the use of fputc and fgetc function to write and read characters in a stream respectively. The following program writes a string(one character at time using fputc) in a new file and again prints it’s content on screen using fgetc.

#include <stdio.h>
#include <string.h>
 
int main (){
   FILE *file;
   char *string = "fputc C Standard Library function";
   int c, counter, length = strlen(string);
 
   file = fopen("textFile.txt", "w+");
   for(counter = 0; counter<length; counter++){
      fputc(string[counter], file);
   }
   /* Reset file pointer location to first character */
   rewind(file);
   /* Read characters from file */
   while(!feof(file)){
      c = fgetc(file);
      printf("%c", c);
   }
   fclose(file);
    
   return(0);
}

Output

fputc C Standard Library function