Validate floats

[Theadmin77]

I have to validate s floats thru a function , but the validation have to be don with a string of 20 characters ....

Any idea how to do thatvalidation floats?

Any help will be very appreciated !!!

This is the code so far :


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

struct project
{
float latitude;
float longitud;
float time;
float distance;
float altitude;
// float latitude;
// float longitude
};

struct projectone
{

project source;
project travel;
project target;
float speed;
float azimuthal;
float equatorial;
};

bool getfloat (float *);

void main()

{
projectone projectile [100];
bool validata;
float value= 0.0;



do
{
cout<< "Enter the Launch speed :";
validata=getfloat(projectile.speed);

if (!validata)
{
cout << "Invalid Input .Try again...\n";
}
}while (!validata);

do
{
cout<< "Enter the Launch azimuthal angle :";
validata=getfloat(projectile.azimuthal);

if (!validata)
{
cout << "Invalid Input .Try again...\n";
}
}while (!validata);

do
{
cout<< "Enter the Launch equatorial angle :";
validata=getfloat(projectile.equatorial);

if (!validata)
{
cout << "Invalid Input .Try again...\n";
}
}while (!validata);

` do
{
cout<< "Enter the source latitude :";
validata=getfloat(projectile.source.latitude);

if (!validata)
{
cout << "Invalid Input .Try again...\n";
}
}while (!validata);

do
{
cout<< "Enter the source longitude :";
validata=getfloat(projectile.source.longitude);

if (!validata)
{
cout << "Invalid Input .Try again...\n";
}
}while (!validata);





}

// function to validate

bool getfloat (float *value)
{
int i;
bool noerrors=true;
i=0;


if (*value <
{

[horace1]

you can validate float input with code such as

float getFloat()
{
      float f;
      while(! (cin >> f))        // attempt to read a float
          {             // if error, ask again
           cout << "error, please reenter ? ";
           cin.clear();           // clear error
           cin.ignore(100,'\n');  // remove faulty characters from line
          }
      return f;              // OK, return value
}
 

if the user enters invalid characters the message will be displayed and they can enter again