Help pls

This is a discussion on Help pls within the C Programming forums, part of the General Programming Boards category; how am i going to copy the hrworked.dat and save it into a new file called pay.dat Code: #include <stdio.h> ...

  1. #1
    Registered User
    Join Date
    Dec 2002
    Posts
    6

    Help pls

    how am i going to copy the hrworked.dat and save it into a new file called pay.dat

    Code:
    #include <stdio.h>
    #include<stdlib.h>
    
    void main()
    {
    	int employee_id;
    	int hrworked;
    	int client_id;
    	FILE *fpEmp;
    
    
    	fpEmp=fopen("Hrworked.dat","w");
    
    	printf("Employee Id:");
    	scanf("%d",&employee_id);
    	if(employee_id>0 && employee_id>1000)
    	{
    		printf("Invalid id\n\n");
    		printf("Please Key in again from the start");
    		main();
    	}
                    printf("\nHour Worked:");
    	scanf("%d",&hrworked);
    	if(hrworked>=1000)
    	{
    		printf("\nInvalid Working hour\n\n");
    		printf("Please key in from the start");
    		main();
    	}
                    printf("Client Id:");
    	scanf("%d",&client_id);
    	if(client_id>=6)
    	{
    		printf("Please key in only 1-5");
    		printf("Please key in from the start");
    		main();
    	}
    
    		
    			fprintf(fpEmp,"%d",employee_id);
    			fprintf(fpEmp,"|%d\n",hrworked);
    			fprintf(fpEmp,"|%d\n",client_id);
    }

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    The simplest way to copy two files is to read a byte from one and write it to the other until there's nothing left.
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    void panic ( void )
    {
      fprintf ( stderr, "Something went wrong\n" );
      exit ( EXIT_FAILURE );
    }
    
    int main ( void )
    {
      int byte;
      FILE *in, *out;
    
      in = fopen ( "hrworked.dat", "r" );
      out = fopen ( "pay.dat", "w" );
    
      if ( in == NULL )
        panic();
      else if ( out == NULL ) {
        fclose ( in );
        panic();
      }
    
      while ( ( byte = fgetc ( in ) ) != EOF )
        fputc ( byte, out );
    
      fclose ( in );
      fclose ( out );
    
      return 0;
    }
    >void main()
    No, main returns int. Anything else is undefined, which is very bad.

    >fpEmp=fopen("Hrworked.dat","w");
    Did this call succeed? How do you know? Check the return value.

    >scanf("%d",&employee_id);
    Always check the return value of scanf as well, otherwise it's incredibly unsafe.

    >if(employee_id>0 && employee_id>1000)
    Somehow I get the feeling that the second test should be

    employee_id < 1000

    >main();
    Never, ever, ever, ever, ever, ever, ever call main recursively unless it's an IOCCC entry.

    -Prelude
    My best code is written with the delete key.

  3. #3
    Registered User
    Join Date
    Dec 2002
    Posts
    6
    Thx's i try it now

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