Question

You will write a program that performs the following tasks for a simple mathematical calculator: (1) Open a user-specified file for input. Prompt for the name of the file, read it into a string variable, echo print it to the terminal and then open it. If the file is not opened, enter into a loop that prints out an error message, resets the input file stream variable (see the hints section), obtains a new file name and tries to open the new file. The loop continues until the user successfully enters a valid file name or presses ctrl-c to exit (2) If the input file is empty, your program should indicate that the input file was empty as shown by the sarkple solution - note that an empty input file message only is printed out for an empty input file. (see the hints section on how to perform this test) (3) The input file contains several lines of information for processing. There are two types of lines: one for Math calculations and one for Trig calculations. a. Math calculation line: Math, Operator, Value1, Value2 i. Operator is +, - for % (for add, subtract, multiply, divide or modulo) ii. Value 1 is the first (left) operand for the operator iii. Value2 is the second(right) operand for the operator b. Trig calculation line: Trig, Operation, Degrees or Radians indicator, Angle Value 1. Operation is s, cort (for sine, cosine or tangent) ii. Degrees or Radians indicator is d or ili. Angle Value is the angle in the same units provided by the Degrees or Radians indicator iv. For Trig calculations use 3.14159265 for the value of pi (store in a double). V. Remember that the trig functions expect the angle in radians not degrees c. Look at the provided input files for further understanding of the expected input. d. After reading a line use an ignore statement to remove all extra information (4) All values are double values except for the values used with the modulo operation which requires both operands be integers. (5) Possible input file errors are: a. Invalid calculation type -- calculation type is not Math or Trig. b. Invalid operator for Math? C. Invalid operation for Trig two different error messages (6) Output formatting uses the default output configuration

this is a C++ program!

Answer 1

#include<stdio.h>
#include<iostream>
#include<fstream>
#include<string>
#include<sstream>
#include<math.h>
using namespace std;

int main()
{
        ofstream myfile;
        string filename;
        string line;
        char op;
        double value1;
        double value2;
        char dORr;
        double anglevalue;
        double pi = 3.14159265;
        bool isEmpty = false;
        while(1)
        {
                cout << "Enter the name of the File :";
                cin >> filename;
                ifstream myfile (filename);
                if (myfile.is_open())
                {
                        //moving to the last position of the file
                        myfile.seekg(0, ios::end);  
                        
                        //if eod the file is the beginning position, file is empty
                        if (myfile.tellg() == 0) {    
                          cout << "Input file empty" << endl;
                          isEmpty = true;
                        }
                        
                        myfile.seekg(0, ios::beg); 
                        
                    while ( getline (myfile,line) )
                    { 
                        if(isEmpty)
                        {
                                break;
                                }
                                
                        istringstream ss(line); 
                        
                                string type; 
                            ss >> type; 
                                if (type == "Math")
                            {
                                ss >> op;
                                ss >> value1;
                                ss >> value2;
                                
                                if(op == '+')
                                {
                                        cout<< "Add: "<<value1<<op<<value2<<" = "<<value1+value2<<endl;
                                        }
                                        else if(op == '-')
                                        {
                                                cout<< "Sub: "<<value1<<op<<value2<<" = "<<value1-value2<<endl;
                                        }
                                        else if(op == '*')
                                        {
                                                cout<< "Mul: "<<value1<<op<<value2<<" = "<<value1*value2<<endl;
                                        }
                                        else if(op == '/')
                                        {
                                                cout<< "Div: "<<value1<<op<<value2<<" = "<<value1/value2<<endl;
                                        }
                                        else if(op == '%')
                                        {
                                                cout<< "Mod: "<<value1<<op<<value2<<" = "<<(int)value1%(int)value2<<endl;
                                        }
                                        else
                                        {
                                                cout<< "Invalid operator for Math";
                                        }
                                } 
                                else if (type == "Trig")
                            {
                                ss >> op;
                                ss >> dORr;
                                ss >> anglevalue;
                                string angletype;
                                //coverting degree to radian because all the function like Cos(), sin() operates on degree in radian
                                if (dORr == 'd')
                                {
                                        anglevalue= anglevalue * (pi/180); // radian = degree * (pi/180)
                                        angletype="degree";
                                        }
                                        
                                        else if(dORr == 'r'){
                                                angletype="radian";
                                        }
                                        
                                if(op == 's')
                                {
                                        cout << "sin("<<angletype<<"): sin("<<angletype<<") = "<< sin(anglevalue)<<endl;
                                        }
                                        else if(op == 'c')
                                        {
                                                cout << "cos("<<angletype<<"): cos("<<angletype<<") = "<< cos(anglevalue)<<endl;
                                        }
                                        else if(op == 't')
                                        {
                                                cout << "tan("<<angletype<<"): tan("<<angletype<<") = "<< tan(anglevalue)<<endl;
                                        }
                                }
                                else{
                                        cout<< "Invalid calculation type - calculation type is not Math or Trig\n";
                                }
                          
                        }
                    myfile.close();
                }
                else
                {
                        cout << "ERROR : File not found/opening\n";
                }
        }
        

}