C program to create a file and display file contents on to the screen

fopen(): This function is used to open an existing file or to create a new file
              FILE *fp;
             fp=fopen(filename, mode);
             mode: mode specifies the type of operation to be done on file
             r: stands for read mode
             w: stands for write mode
             a: stands for append mode

getc(): this function is used to read one character at a time from the file opend in read mode.

putc(): this function is used to write one character at a time to a file opend in write mode

fclose(): this function is used to close the opend file

getw():this function is used to read one integer at a time from the file opend in read mode.

putw(): this function is used to write one integer at a time to a file opend in write mode


NOTE: Every file in c ends with EOF (stands for end of file an integer value).
         
/* C program to create a file and giving input from the keyboard */

main()
{
   FILE *fp;
   char c;
   fp=fopen("sample.txt","w");   /* sample.txt is a new file opend in write mode */
   if(fp==NULL)
   {
     printf("\n file cannot be created ");
     exit(1);
    }
   printf("\n enter your data on to the file");
   while((c=getchar())!='$')   /* after entering all the data press $(assumed end of the data) */
   {
      putc(c,fp);   /* placing data on to the  file one character a time */
    }
    printf("\n file successfully created");
 
}
output:
     enter your data on to the file
     hi raj how are you?$
     file successfully created

note: there is no specified end when reading from the keyboard so assuming $ as end of input data or you can assume any other symbol as end of keyboard data


/* C program to display file contents on to the screen*/  

main()
{
     FILE *fp;
     char c;
     fp=fopen("sample.txt","r");   /* sample.txt is opend in read mode */
     if(fp==NULL)
     {
       printf("\n file does not exist");
       exit(1);
     }

     while((c=getc(fp))!=EOF)     /*  EOF stands for end of the file */
       {
          printf("%c",c);   /* placing data on to the screen*/
        }
}

OUTPUT:
                  hi raj how are you?


                                C program to copy one file to another file


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