Question

The Percentage Problem

BACKGROUND: If you've followed lecture, you already know almost everything there is about arrays. Now you need some practice! The following problem appeared several years ago on an exam as a question. (Consequently it should be a short program!) Working completely alone (although you can ask the instructor questions, as always), see if you understand arrays well enough to do it. TASK: Write a complete C++ program to solve the following problem. PROGRAM DESCRIPTION: An unknown number of integers, but no more than 25, are to be read from the file exam. dat. (Yes, this means you have to open that file.) Calculate and output their sum. Next output, one entry per line, each number and its percentage of the sum. Line these up in columns. The first column should be 10 characters wide; the should be 7 characters wide, not including the percent sign. The percentages should be rounded to the nearest tenth. See sample output below. PROGRAM INTERNALS: Since the program is so short, you do not need to define any functions other than main(). You may assume the input data is error-free and need not be checked for correctness. The input data file is to be read only once; you are NOT allowed to open the input file a second time NOR in some way rewind the input file. Output is to standard output (stdout). SAMPLE OUTPUT: Sum Equals: 200 45 5 30 20 100 22.5% 2.5% 15.0% 10.0% 50.0% IMPLEMENTATION NOTES: Use as your source file name "percentage.cpp". Use as your executable file name "ola204". Do not forget to use the standard style conventions; that is, to comment, indent, and use mnemonic names appropriately. When you are ready to test run your program, symbolically link the file SPUB/percentage.dat to your account as exam.dat and use it. $ cd w/OLA/ola 204 $ In -s $PUB/percentage.dat exam.dat UNDER CONSTRUCTION: Warning! Section above will be revised (sooner or later) to more clearly reflect that you must use CodeLite to develop your program. In any event, use CodeLite. REQUIRED: You are to electronically submit the source program. Once you have a working program. the following UNIX commands will do what is required: $ cd /OLA/ola204 $ handin "ola204" percentage.cpp

Answer 1

Thanks for the question.

Below is the simple code you will be needing.

Note : When you run the program in your pc, please update the file's path location of the exam.dat file in the below line -

char *filename="F:\\exam.dat";

Thank You !!

===========================================================================

#include<iostream>
#include<fstream>
#include<iomanip>
using namespace std;

const int MAX=25;

int main(){
  
   char *filename="F:\\exam.dat";
   int numbers[MAX];
   ifstream infile(filename);
  
   int count=0;
   int total=0;
   int number;
   if(infile.is_open()){
       while (infile>>number && count <MAX){
           total+=number;
           numbers[count++]=number;
       }
       infile.close();
      
       cout<<setw(10)<<left<<"Sum Equals:"<<setw(7)<<right<<total<<endl;
       cout<<endl;
      
       for(int i=0; i<count;i++){
          
           cout<<setw(10)<<right<<numbers[i]
               <<setw(7)<<fixed<<setprecision(1)
               <<100.0*numbers[i]/total<<"%"<<endl;
       }
      
      
      
   }else{
       cout<<"ERROR: Unable to read data from file: "<<filename<<endl;
   }
}

:: :: ~ * TDM-GCC 4.9.2 64-bit Release v jau Eile Edit Search View OO Project Classes Debug Projects Project Execute Tools AStyle Window Help 25 12 Percentage.cpp #include<iostream> #include<fstream> 3 #include<iomanip> 4 using namespace std; I C:\Users\User\Documents\Percentage.exe Sum Equals: 200 const int MAX=25; 99 int main() { char *filename="F:\\exam.dat"; int numbers[MAX]; ifstream infile(filename); 45 5 30 20 100 22.5% 2.5% 15.0% 10.0% 50.0% 100 Process exited after 0.1076 seconds with return value o Press any key to continue ... int count=0; int total=0; int number; if(infile.is_open(){ while (infile>>number){ total+=number; numbers[count++]=number; infile.close(); cout<<setw(10)«<left<<"Sum Equals:"<<setw(7)<<ric cout<<endl; for(int i=0; i<count;i++) { cout<<setw(10)«<right<<numbers[i] <<setw(7)«<fixed<<setprecision(1) <<100.0*numbers[i]/total<<"%"<<endl; 88 Compiler (2) Resources all compile Log ✓ Debug C. Find Results Close Line Col File Message C:\Users\User\Documents\Percentage.cpp In function 'int maino: 11 17 C:\Users\User Documents\Percentage.cpp Warning) deprecated conversion from string con line: 15 Col: 17 Selso l ines: 40 Tength: 719 Insert Pone narsing in 0.047 seconds