Thread: Drama with file pointers and loop to next command

I'm about done with the code but I don't know how to file pointer to a function . Another issue I have and had is the program doesn't go to next line of code .



I need help with the following

- how to put a file pointer to a function
- deal with program not looping to next of file
- End the program when program encounter Q

Sample of Input file

PJ
+ -3 4
+ -4 -71
- 10 2
- -41 -7
H
* 3 -4
* 2 2
/ 141 13
/ 14 -3
H
c F
C g
P 2134 3
R 3.141500000 2
R 3.141500000 3
R 0.010157 2
S -3.141500
S 31.41500
Q
H

Code:

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


    void Add(  FILE *Calculatorfileoutput ,const char * Line );
    void Multiply ( FILE * Calculatorfileoutput , const char * Line);
    void Subtract (FILE * Calculatorfileoutput , const char * Line);
    void Divide (FILE * Calculatorfileoutput , const char * Line);
    void Changecase_UP (FILE * Calculatorfileoutput , const char * Line);
    void Changecase_Down (FILE * Calculatorfileoutput , const char * Line);
    void PrintKD (FILE * Calculatorfileoutput , const char * Line);
    void PrintRR (FILE * Calculatorfileoutput , const char * Line);
    void Separate (FILE * Calculatorfileoutput , const char * Line);
    void Help (FILE * Calculatorfileoutput , const char * Line);
    void Quit (FILE * Calculatorfileoutput , const char * Line);




int main ( void )
{


    FILE *Calculatorfile;
    Calculatorfile = fopen( "input.txt", "r");


    FILE *Calculatorfileoutput;
    Calculatorfileoutput = fopen("output.txt" , "w");






        while(!feof(Calculatorfile))
        {
            char Buffer[256];
            if(!fgets(Buffer,256,Calculatorfile)) // fgets returns 0 when EOF or Error occurs
            {
               break;
            }




            switch(Buffer[0]) // Check the first char in the current line
            {
                case '+' :
                 Add(  Calculatorfileoutput , Buffer );
                 break;


                case '*' :
                 Multiply ( Calculatorfileoutput , Buffer );
                 break;


                case '-' :
                 Subtract (Calculatorfileoutput , Buffer );
                 break;


                case '/' :
                 Divide (Calculatorfileoutput , Buffer );
                 break;


                case 'C' :
                 Changecase_UP (Calculatorfileoutput , Buffer );
                 break;


                case 'c' :
                 Changecase_Down (Calculatorfileoutput , Buffer );
                 break;


                case 'P' :
                 PrintKD (Calculatorfileoutput , Buffer );
                 break ;


                case 'R' :
                 PrintRR (Calculatorfileoutput , Buffer );
                 break;


                case 'S' :
                 Separate (Calculatorfileoutput , Buffer );


                case 'H' :
                 Help (Calculatorfileoutput , Buffer );
                 break;
                //case 'Q' :
                 //Quit (Calculatorfileoutput , Buffer );
                 //break;


                //default :


                 // some command
            }


            rewind(Calculatorfile);
        }






        fclose(Calculatorfile);
        fclose(Calculatorfileoutput);


        return 0 ;


}


void Add( FILE *Calculatorfileoutput ,const char * Line )


{


    int Operator1 = 0;
    int Operator2 = 0;


    sscanf(Line,"+ %d %d\n",&Operator1, &Operator2); // It's like a scanf from a string, so a sscanf.
    printf("Result of %d + %d = %d\n",Operator1, Operator2,Operator1+Operator2);
    fprintf( Calculatorfileoutput,"Result of %d + %d = %d\n",Operator1, Operator2,Operator1+Operator2);


}


void Multiply ( FILE * Calculatorfileoutput , const char * Line)
{
    int Operator1 = 0;
    int Operator2 = 0;


    sscanf(Line,"- %d %d\n",&Operator1, &Operator2); // It's like a scanf from a string, so a sscanf.
    printf("Result of %d - %d = %d\n",Operator1, Operator2,Operator1-Operator2);
    fprintf( Calculatorfileoutput,"Result of %d - %d = %d\n",Operator1, Operator2,Operator1-Operator2);
}


void Subtract (FILE * Calculatorfileoutput , const char * Line)
{
    int Operator1 = 0;
    int Operator2 = 0;


    sscanf(Line,"* %d %d \n",&Operator1, &Operator2); // It's like a scanf from a string, so a sscanf.
    printf("Result of %d * %d = %d \n",Operator1, Operator2,Operator1* Operator2);
    fprintf( Calculatorfileoutput,"Result of %d * %d = %d \n",Operator1, Operator2,Operator1*Operator2);
}
void Divide (FILE * Calculatorfileoutput , const char * Line)
{
    int Operator1 = 0;
    int Operator2 = 0;


    sscanf(Line,"/ %d %d \n",&Operator1, &Operator2); // It's like a scanf from a string, so a sscanf.
    printf("Result of %d / %d = %d \n",Operator1, Operator2,Operator1 / Operator2);
    fprintf( Calculatorfileoutput,"Result of %d * %d = %d\n",Operator1, Operator2,Operator1/Operator2);


}
void Changecase_UP (FILE * Calculatorfileoutput , const char * Line)
{
    char UP_Word[256];


    sscanf(Line,"C %s\n", UP_Word ); // It's like a scanf from a string, so a sscanf.




    printf("UPPER CASE : %s\n", strupr(UP_Word ) );
    fprintf( Calculatorfileoutput,"UPPER CASE : %s \n", strupr(UP_Word ) );


}
void Changecase_Down (FILE * Calculatorfileoutput , const char * Line)
{
    char down_Word[256];


    sscanf(Line,"C %s\n", down_Word ); // It's like a scanf from a string, so a sscanf.




    printf("lower case : %s\n", strupr(down_Word ) );
    fprintf( Calculatorfileoutput,"lower case : %s \n", strlwr(down_Word ) );


}
void PrintKD (FILE * Calculatorfileoutput , const char * Line)
{


}
void PrintRR (FILE * Calculatorfileoutput , const char * Line)
{


}


void Separate (FILE * Calculatorfileoutput , const char * Line)
{
      char String_Separate [256];


      sscanf(Line , "S %s" , String_Separate );


      char * PtrtoString;


      PtrtoString = strtok (String_Separate," ");
      while (PtrtoString != NULL)
      {
        printf ("%s ",PtrtoString);
        fprintf( Calculatorfileoutput,"%s" ,PtrtoString);
        PtrtoString = strtok (NULL, " ");
      }


}




void Help (FILE * Calculatorfileoutput , const char * Line)
{


    printf(  " \t + i j [Integer Add]  Add integers i and j and print out result \n "
             " \t * i j [Integer Multiply]  Multiply integers i and j and print out result \n "
             " \t - i j [Integer Subtract ]  Subtract integer j from i and print out result \n "
             " \t / i j [Integer Divide ]  Divide integer i by j and print out result of integer division \n "
             " \t C Ch [Character Case Change ]  Change character Ch to uppercase and print it out \n "
             " \t c Ch [Character Case Change]  Change character Ch to lowercase and print it out \n "
             " \t P i k [Print k-th Digit ]  Print out the k-th digit of integer i \n "
             " \t R x i [Round Reals ]  Round double value x to i decimal places \n "
             " \t S x [Separate ]  Separate out the sign, integer part and fractional part of double value x \n "
             " \t H [Help ]  Print a short synopsis of all the available commands \n "
             " \t Q [Quit ]  Quit \n " );


     fprintf( Calculatorfileoutput  ," \t + i j [Integer Add]  Add integers i and j and print out result \n "
             " \t * i j [Integer Multiply]  Multiply integers i and j and print out result \n "
             " \t - i j [Integer Subtract ]  Subtract integer j from i and print out result \n "
             " \t / i j [Integer Divide ]  Divide integer i by j and print out result of integer division \n "
             " \t C Ch [Character Case Change ]  Change character Ch to uppercase and print it out \n "
             " \t c Ch [Character Case Change]  Change character Ch to lowercase and print it out \n "
             " \t P i k [Print k-th Digit ]  Print out the k-th digit of integer i \n "
             " \t R x i [Round Reals ]  Round double value x to i decimal places \n "
             " \t S x [Separate ]  Separate out the sign, integer part and fractional part of double value x \n "
             " \t H [Help ]  Print a short synopsis of all the available commands \n "
             " \t Q [Quit ]  Quit \n " );






}
/*void Quit (FILE * Calculatorfileoutput , const char * Line)
{


   if ( )


*/