How to format an array and output?

Question

Ok need some help. I have read in a file to an array. I need to take the array and format it so that the numbers are formatted. The text file is just a list of numbers. For example, I need to take the first two numbers and format them so that it is printed out to the console like this: "1-0". Here is my code so far. Notice the incomplete function where the formatting should take place.

#include<iostream>
#include<cmath>
#include<cstdlib>
#include<string>
#include<fstream>

using namespace std;

string ArrayFormat(int array[]);

int main() {

const int ARRAY_SIZE = 21;
string filename;
ifstream inputfile;

int score[ARRAY_SIZE];


cout <<"\nPlease enter the name of a file: ";
cin >> filename;

inputfile.open(filename.c_str());
if (inputfile.fail()){
    perror(filename.c_str());
    exit(1);
}// end of error test

for (int i=0;i<20;i++){
    inputfile >> score[i];
   // cout << score[i] << endl;
}// end of for loop to read into array
inputfile.close();


}// end of main


string ArrayFormat(int array[]){


for(int i=0; i<=21; i++){

}


}// end of ArrayFormat

What format are they initially being stored into the array? Please clarify exactly what you're in need of. — davepmiller
– davepmiller, Commented Nov 2, 2012 at 2:01
What happens to the rest of the numbers beyond the second one? — Sergey Kalinichenko
– Sergey Kalinichenko, Commented Nov 2, 2012 at 2:02

Syntactic Fructose · Accepted Answer · 2012-11-02 05:06:02Z

1

for(int i = ; i < 21; i++)
{
   if(i%2 == 1) 
      std::cout << "-" << array[i] << "\t";
   else
      std::cout << array[i];
}

this will print the array in pairs of 2's, with the correct format.

EDIT: Why is the array odd if you need to print out pairs of numbers?

edited Nov 2, 2012 at 5:06

answered Nov 2, 2012 at 2:03

Syntactic Fructose

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5 Comments

user1793058 Over a year ago

The last set of numbers is actually 3 numbers 1-3-0. That is why it is 21.

user1793058 Over a year ago

This is really close. However, they need to be printed out on the same line. This prints one per line. And I didn't mention that the last set of numbers is 3 numbers. So the last index should be 1-1-1. Any advice how I can add a tab "\t" between each formatted output and have them on the same line?

Syntactic Fructose Over a year ago

will the last set always be 3 numbers? I don't understand why you want all the numbers to be displayed in pairs of two except for the last three numbers, if it is only the last three then that would be easy to fit in, i changed the code to be more efficient and loop through each variable.

user1793058 Over a year ago

Yes the last set will always be 3 numbers. I attempted to use the edited code and while it is close to what I need, it does not work. The output is as follows: -1 1-2 4-5 0-8 1-4 0-3 2-2 5-3 1-4 3-8 1-4 3883031360. When the output should be 1-1 2-4 5-0 8-1 4-0 3-2 2-5 3-1 4-3 8-1 4-3-3. The tabs do not carry over in the post here so sorry if it is jumbled.

Syntactic Fructose Over a year ago

fixed the code, it should print all of the array in pairs of two. Making the last pair three would simply be adding a conditional statement checking if the array is at its end, in which case you add another '-' instead of '-' and tabbing.

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