Understanding passing function through arrays

glacier · #1 03-Sep-2008, 05:01

Hi there,
I am very Confuse in C++program I took introduction C++ programming 4 years ago so now I forgot everything which I learnet on that time.My question is that.
I have to write a program in C++ to use a function by entering upto 10 floating point values and these values should be stored in arrays, and the values should be displayed the user with identifying text: sum of all values,average values I/p, largest values i/p,smallest value I/p.

we need to write 2 function getData and processData where get get data recieve 3 parameter list, maximum number, and actual number of values. and processData two parameter-list and current number and do all thing sumand avg, large and small.

so that was the program description now my question is that here first of all what is list and I tried to write few lines of codes which are here

CPP / C++ / C Code:

# include< iostream>
using namespace std;

void getData (const int [], int, int);
void processData (const int [], int);

int main()
{
const int a[arraySize];
int value;

cout<<"enter the floating point value"<< a[arraySize]<<value;
getData( const a[arraySize]);
getData(int value);

return 0;
}

void getData (const int [], int, int)
{
for( int value= 0; value< a[arraySize]; value++)

}

Mexican Bob · #2 03-Sep-2008, 11:09

You need to work with "float" data type and not "int" data type.

CPP / C++ / C Code:

#include <iostream>

using namespace std;

int main()
{
    cout << "Enter a floating point number: ";
    float f;
    cin >> f;
    cout << "You entered: " << f << endl;

    return 0;
}

Output:

Code:

$ ./getfloat
Enter a floating point number: 23.10389
You entered: 23.1039

...there is no benefit to using an "int" array.

Mexican Bob

Howard_L · #3 03-Sep-2008, 22:33

Quote:

my question is that here first of all what is list

A list is just what it says: a list!
A list is a group of data of the same type which are stored in some sequential
fashion so that they can be accessed and manipulted.

A simple example would be an array as in this random list of chars:

CPP / C++ / C Code:

char charray[10]= { h, f, c, k, e, b, g, a, i, d, j };

An IMPORTANT thing to note here is that the identifier 'charray' is a pointer
to a contiguous block of 10 chars in memory.

A more advanced example might be an array of arrays or 'list of lists' ...like this 'list' of 3 words:

CPP / C++ / C Code:

char charray[3][10]= {
  {  a,  p,  p,  l,  e, \0, \0, \0, \0, \0 }
  {  o,  r,  a,  n,  g,  e, \0, \0, \0, \0 }
  {  p,  e,  a,  r, \0, \0, \0, \0, \0, \0 }
};

In this example the identifier 'charray' is a pointer to a 3 pointers which
each point to a block of 10 chars. This too is stored in a contiguous block of memory.

You can have a 'list' of any data type: int, float, even structures or classes. A list does not have to be an stored in an array. A 'list' can be allocated as the program runs and so would be stored at non-contiguous memory and so other means used to determine where the members are located (which is for later study).

From what I can understand from your description above, your 'list' is to be:

Quote:

up to 10 floating point values and these values should be stored in arrays

What is not said is how many arrays...
But like above here are 3 arrays of 10 each except they are in type float:

CPP / C++ / C Code:

float float-array[3][10]= { 
  { 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 }
  { 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.0 }
  { 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.0, 1.1 }
};

You could make that 10 arrays or 1000 arrays,,, the principles are the same.
What you will need to learn to do is pass a pointer to the array (or array member) to the functions along with the sizes of the array.
Are you with us so far? Do you understand pointers?
Practice by passing a c string (array of type char) to a function and printing it from the function.

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Understanding passing function through arrays

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