Writing into a file

 The writing into a file operation is performed using the following pre-defined file handling methods.

1. putc()
2. putw()
3. fprintf()
4. fputs()
5. fwrite()

putc( char, *file_pointer ) - This function is used to write/insert a character to the specified file when the file is opened in writing mode.

 #include<stdio.h>
#include<conio.h>


int main(){

   FILE *fp;
   char ch;
   fp = fopen("D://program.txt","w");
   putc('A',fp);
   ch = 'B';
   putc(ch,fp);
   fclose(fp);
   getch();

   return 0;
} 

Output

 
putw( int, *file_pointer ) - This function is used to writes/inserts an integer value to the specified file when the file is opened in writing mode.

#include<stdio.h>
#include<conio.h>


int main(){

   FILE *fp;
   int i;
   fp = fopen("D://program.txt","w");
   putw(66,fp);
   i = 100;
   putw(i,fp);
   fclose(fp);
   getch();

   return 0;
}

Output

 

 

fprintf( *file_pointer, "text" ) - This function is used to writes/inserts multiple lines of text with mixed data types (char, int, float, double) into specified file which is opened in writing mode.

#include<stdio.h>
#include<conio.h>


int main(){

   FILE *fp;
   char *text = "\nThis is my Programming Blog";
   int i = 10;
   fp = fopen("D://program.txt","w");
   fprintf(fp,"This is line1\nThis is line2\n%d", i);
      fprintf(fp,text);
   fclose(fp);
   getch();

   return 0;
}

Output

fputs( "string", *file_pointer ) - This method is used to insert string data into specified file which is opened in writing mode.

#include<stdio.h>
#include<conio.h>


int main(){

   FILE *fp;
   char *text = "\nThis is my Programming Blog";
   fp = fopen("D://program.txt","w");
   fputs("Hi!\nHow are you?",fp);
   fclose(fp);
   getch();

   return 0;
}
 

Output

 

 

fwrite( “StringData”, sizeof(char), numberOfCharacters, FILE *pointer ) - This function is used to insert specified number of characters into a binary file which is opened in writing mode.

#include<stdio.h>
#include<conio.h>


int main(){

   FILE *fp;
   char *text = "Welcome to C Language";
   fp = fopen("D://sample.txt","wb");
   fwrite(text,sizeof(char),5,fp);
   fclose(fp);
   getch();

   return 0;
}
 

Output