string array input problem

**DoItAllMom115** · 03-24-2003

Why won't this let me input data from the keyboard for the species string array?

Code:

int main (void)
{


//declare arrays
int Length[numberFish];
int Weight[numberFish];
string Species[numberFish];

//declare
int l=0, w=0, s=0, t=0;
int numberFish=0;

cout<<"Enter number of fish:"<<endl;
cin>>numberFish;

//get input

for (s=0;s<numberFish;s++;w=0;w<numberFish;w++;l=0;l<numberFish;l++)
{
	cout<<"Enter species:"<<endl;
	cin.getline(Species,s);
	cout<<"Enter weight in ounces:"<<endl;
	cin>>Weight[w];
	cout<<"Enter length in inches:"<<endl;
	cin>>Length[l];
}
return EXIT_SUCCESS;
}

**Prelude** · 03-24-2003

>for (s=0;s<numberFish;s++;w=0;w<numberFish;w++;l=0;l<n umberFish;l++)
I have no idea how you could think this would work. It goes against every description and example code ever written for a for loop.

>cin.getline(Species,s);
The first argument to getline should be an istream, not an array of strings.

-Prelude

**DoItAllMom115** · 03-24-2003

I have no idea what you mean.

I am trying to get input from the keyboard and put it into an array Species[s]

the other strings are working ok, but it does not let me enter info for the Species.

**DoItAllMom115** · 03-24-2003

Code:

cout<<"Enter number of fish:"<<endl;
cin>>numberFish;
//get input
for (s=0;s<numberFish;s++)

{
	cout<<"Enter species:"<<endl;
	cin>>Species[s];
}
for (w=0;w<numberFish;w++)
{
	cout<<"Enter weight in ounces:"<<endl;
	cin>>Weight[w];
	
}
for (l=0;l<numberFish;l++)
cout<<"Enter length in inches:"<<endl;
	cin>>Length[l];
return EXIT_SUCCESS;
}cout<<"Enter number of fish:"<<endl;
cin>>numberFish;
//get input
for (s=0;s<numberFish;s++)

{
	cout<<"Enter species:"<<endl;
	cin>>Species[s];
}
for (w=0;w<numberFish;w++)
{
	cout<<"Enter weight in ounces:"<<endl;
	cin>>Weight[w];
	
}
for (l=0;l<numberFish;l++)
cout<<"Enter length in inches:"<<endl;
	cin>>Length[l];
return EXIT_SUCCESS;
}

and STILL cannot input species from the keyboard!!

HELP

**Prelude** · 03-25-2003

Study this:

Code:

#include <iostream>
#include <string>

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::getline;

int main (void)
{
  int i;
  const int numberFish = 3;

  //declare arrays
  int Length[numberFish];
  int Weight[numberFish];
  string Species[numberFish];

  //get input
  for (i = 0; i < numberFish; i++)
  {
    cout<<"Enter species:"<<endl;
    getline(cin, Species[i]); // Read a line into a string
    cin.ignore(); // Quikie clean up

    cout<<"Enter weight in ounces:"<<endl;
    cin>>Weight[i];
    cin.ignore(); // Quikie clean up

    cout<<"Enter length in inches:"<<endl;
    cin>>Length[i];
    cin.ignore(); // Quikie clean up
  }

  for (i = 0; i < numberFish; i++)
  {
    cout<<"Species: "<< Species[i] <<endl;
    cout<<"Weight:  "<< Weight[i] <<endl;
    cout<<"Length:  "<< Length[i] <<endl;
  }
}

Alternatively, you could group everything together in a struct and then dynamically allocate an array of objects. This would make things considerably easier and you could define numberFish without bending over backward:

Code:

#include <iostream>
#include <string>

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::getline;

struct Fish
{
  string Name;
  int Length;
  int Weight;
};

int main (void)
{
  int i;
  int numberFish;

  cout<<"Enter the number of fish: ";
  cin>> numberFish;
  cin.ignore();

  Fish *Species = new Fish[numberFish];

  //get input
  for (i = 0; i < numberFish; i++)
  {
    cout<<"Enter species:"<<endl;
    getline(cin, Species[i].Name); // Read a line into a string
    cin.ignore(); // Quikie clean up

    cout<<"Enter weight in ounces:"<<endl;
    cin>> Species[i].Weight;
    cin.ignore(); // Quikie clean up

    cout<<"Enter length in inches:"<<endl;
    cin>> Species[i].Length;
    cin.ignore(); // Quikie clean up
  }

  for (i = 0; i < numberFish; i++)
  {
    cout<<"Species: "<< Species[i].Name <<endl;
    cout<<"Weight:  "<< Species[i].Weight <<endl;
    cout<<"Length:  "<< Species[i].Length <<endl;
  }
}

-Prelude

**DoItAllMom115** · 03-25-2003

read in a number of values representing length, species and wight of fish
read in all values then deermine average weights, minimum and maximun number of fish sampled for each species
end of data marked by negative length
output should be in tabular form
must use arrays

HERE'S MY CODE SO FAR:

Code:

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <string>
using namespace std;

//Project 4
//Amy E Peabody
//March 23, 2003

int main (void)
{

//declare
int l=0, w=0, s=0;
int numberFish=0;
int aveweight=0, totalweight=0;


//declare arrays
int Length[10];
int Weight[10];
string Species[10];

cout<<"Enter number of fish:"<<endl;
cin>>numberFish;

//get input
for (l=0;l<numberFish;l++)
{
	cout<<"Enter species of each fish, length in inches and weight in ounces:"<<endl;
	cin>>Species[s]>>Length[l]>>Weight[w];
	w++;
	s++;
}

//total and average weight
int t;
for (t=0;t<10;t++)
{
	totalweight+=Weight[t];
	aveweight=totalweight/t;
}

//max and min lengths
int maxLength=Length[0];
int minLength=Length[0];
for(l=0;l<10;l++)
{
	if (Length[l]<maxLength){
		maxLength=Length[l];
	}
	if (Length[l]<minLength){
		minLength=Length[l];
	}
}


return EXIT_SUCCESS;
}

**elad** · 03-25-2003

Code:

//get input
for (l=0;l<numberFish;l++)
{
	cout<<"Enter species of each fish, length in inches and weight in ounces:"<<endl;
	cin>>Species[s]>>Length[l]>>Weight[w];
	w++;
	s++;
}
[

You don't need s and w here. As long as s, l, and w, start out with the same value; s, l, and w are always going to be the same in this loop, so just use one index, not three.

Code:

for (t=0;t<10;t++)
{
	totalweight+=Weight[t];
	aveweight=totalweight/t;
}

what if numberfish doesn't equal 10?
why not use numberfish as the denominator for aveweight?
why calculate aveweight each time through the loop? Wouldn't doing it once after you add up totalweight be sufficient?

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string array input problem

huh?

so I changed it to this:

Heare's what I'm supposed to do:

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