Title: Lab 14
Description: Simple File Input and Output
Points: 100
Source Code File Name: <G-Number>-lab14.c
Subject Key: CS133U Lab 14 Submission
Standard Input:
         Input file name as command line argument argv[1]
         Input file contains three floating values and an operator, e.g.
               2.5
               3.5
               4.5
               +

Introduction
------------
        This assignment extends input and output to file streams.  You have used printf and scanf
        in earlier assignments, and in this lab you should use the more general fscanf and fprintf 
        functions to read and write to files.

        Your program will accept the name of an input file from the command line, specifically argv[1].
        If you are using DevC++ then you will need to set the name of the input file in the Execute/Parameters
        dialog box.  You may use any valid file name you wish, but the file must have the format shown in the
        "Standard Input" section, i.e. three float values followed by a char value (a total of four lines
        in the file).  Keep in mind that when I grade your program I will use my own file name, so do not
        hard-code a file name into your code - use the name specified in argv[1].

        Your program will read the numbers and the operator from the input file, and then display the sum of 
        the values.  Please note that while you must read the operator character from the file, you do NOT
        need to interpret the operator character.  You can simply add the three values no matter what operation
        is specified.

        After displaying the sum of the three values your program will write "Hello World!" to an output
        file called "lab14.output".

Instructions
============
        1. Copy the 'hdrm.c' file to 'lab14.c' and use it as the starting point for your code.  Update the
           comments in the file to reflect this assignment.

        2. The command line argument argv[1] contains the input file name.  Open this file for input.

        3. Read the 4 lines of the input file (3 float values and 1 char value) and close the file.

        4. Display the values you read

        5. Display the sum of the 3 float values with a precision of 3 decimal places

        6. Open the file 'lab14.output' for output

        7. Write the string "Hello World!" to the output file 'lab14.output' and close the output file


Submission
==========
Your source code file must be named <G-Number>-lab14.c, and must be an ASCII text file. 
You should submit just the source code file - no executable code! 
I will compile and execute your source code on my grading system and return a 
feedback file to you in a few days.

You will submit your <G-Number>-lab14.c source code file using Blackboard, 
as discussed in class. Submit your code to the Lab 4 assignment dropbox.

Standard Input
==============
13:27:16> cat lab14.input
2.5
3.5
4.5
+

Sample Output
=============

13:27:19> lab14.exe lab14.input
Read the following values from 'lab14.input':
        2.500
        3.500
        4.500

2.500 + 3.500 + 4.500 = 10.500

Press ENTER to end
[normal program end]

13:27:38> cat lab14.output
Hello World!
13:27:43>

/**
	@page lab14 Simple Input and Output
	This program accepts the name of an input file, reads numbers and operators
	from the input file and then dispalys the sum of the numbers.
	@section Authors
	@author Justin Foss
	<p>
	@section Contributors
	- N/A
	*/
	/**
	@file G03426789.c
	@version 1.0
	@details
	Demonstrate input and output using fscanf and fprintf
	*/
	#include <stdio.h>
	#include <stdlib.h>
	

    

void main_end();                                



int main(const int argc, const char **argv)
{
    float val_A, val_B, val_C, sum; //Float variable
    char ch_A, str[30];             //Character and String variable
    FILE *fp;                       //File pointer
    
    //Prompt to enter filename
    printf("Enter filename: \n");  
    
    //Opens and reads file specified in argv[1]
    fp = fopen(argv[1], "r");       
    
    //Scans values from specified file
    fscanf(fp, "%f %f %f %c", &val_A, &val_B, &val_C, &ch_A);

    //Stores filename to string variable
    str[30] = fp;  
    
    //Calculates the sum of the three values in specified file
    sum = val_A + val_B + val_C;
    
    //Displays error message if file does not exist
    if (fp == NULL)
      printf("Not a valid file\n");
    
    //Displays values and the sum of the values from the specified file
    else if (fp != NULL){
         printf("Read the following values from '%s'\n", str);
         printf("\t%.3f\n \t%.3f\n \t%.3f\n", val_A, val_B, val_C);
         printf("\n%.3f + %.3f + %.3f = %.3f", val_A, val_B, val_C, sum);
          
         
}
  //Closes file
  fclose(fp);
}
                               
                                               

void main_end()
{
      printf("Press ENTER to end");
      fgetc(stdin);                                
      printf("[normal program end]\n");
      exit(0);                                     
}

    //Stores filename to string variable
    str[30] = fp;

    //Prompt to enter filename
    printf("Enter filename: \n");  
    
    //Opens and reads file specified in argv[1]
    fp = fopen(argv[1], "r");

    //Displays error message if file does not exist
    if (fp == NULL)
      printf("Not a valid file\n");

void main_end()
{
      printf("Press ENTER to end");
      fgetc(stdin);                                
      printf("[normal program end]\n");
      exit(0);                                     
}

/**
	@page lab14 Simple Input and Output
	This program accepts the name of an input file, reads numbers and operators
	from the input file and then dispalys the sum of the numbers.
	@section Authors
	@author Justin Foss
	<p>
	@section Contributors
	- N/A
	*/
	/**
	@file G03426789.c
	@version 1.0
	@details
	Demonstrate input and output using fscanf and fprintf
	*/
	#include <stdio.h>
	#include <stdlib.h>
	

    

void main_end();                                



int main(const int argc, const char **argv)
{
    float val_A, val_B, val_C, sum; //Float variable
    char ch_A;                      //Character variable
    FILE *fp;                       //File pointer
    
    fp = argv[1];
    
     //Displays error message if file does not exist
    if (fp == NULL){
      printf("Not a valid file\n");
      exit(1);
       }
   
   //Scans values from specified file
   else if (fp != NULL){
    fp = fopen(argv[1], "r"); 
    fscanf(fp, "%f %f %f %c", &val_A, &val_B, &val_C, &ch_A);
    sum = val_A + val_B + val_C;
         printf("Read the following values from %s\n", argv[1]);
         printf("\t%.3f\n \t%.3f\n \t%.3f\n", val_A, val_B, val_C);
         printf("\n%.3f + %.3f + %.3f = %.3f", val_A, val_B, val_C, sum);
          
         
}
  //Closes file
  fclose(fp);
  fgetc(stdin);
}
                               
                                               
void main_end()

{
      printf("Press ENTER to end");
      fgetc(stdin);                                
      printf("[normal program end]\n");
      exit(0);                                     
}

    fp = argv[1];