using cin to get a float

I can't get cin to take a type float from the keyboard. I am entering them into an array with a for loop but when I put an 'f' at the end to indicate a type float I get kicked out of the loop. If I just initialize the array with '10.2f' for example it works fine.???

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cctype>
using namespace std;

const int ELEMENTS = 10;
void arySorter(float *p, size_t n);

int main()
{
int i;
float ary2Sort[ELEMENTS]/* = {12.2f,1.1f,9.9f,2.2f,6.6f,44.4f,7.7f,3.3f,5.5f,4. 4f}*/;
float *sortPtr;
sortPtr = ary2Sort; // init sortPtr

for(i = 0; i < ELEMENTS; ++i) { //get numbers
cout << "Enter a number to be sorted: " << endl;
cin >> ary2Sort[i];
}

cout << "\nPrint unsorted array" << endl;

for(i = 0; i < ELEMENTS; i++) // print the array
cout << ary2Sort[i] << endl;

You mean when the program is running and you fill the array it chokes on something like 1.4f? That is to be expected, cin is expecting a float and you give it a float then a character. When the program is running all you have to do to enter a float is type the number, such as 1.4, and it should work fine.

-Prelude

Thank you. The program does run fine.

You sure it's not promoting the floats to doubles?

I used the following code to check it. THey are floats in the end.

cout << sizeof(float) << "double" << sizeof(double) << " element " <<
sizeof(ary2Sort[0]) << endl;

THe output was "4double8 element 4"

Thanks for the idea.

>You sure it's not promoting the floats to doubles?
cin works in such a way so that if you tell it to read in a float it will read a float and not promote it to a double. If the variable you are reading into is a double then the end result will be a double, cin is a smart input device and only reads the type of the variable you tell it to read to.

This is why you can use
int i;
if ( cin>>i )
to determine if the input was valid or not, if the user entered a char then cin will fail and the if statement will fail as well.

-Prelude

That error checking is great. I will put it in my program. Thanks