\" I can getthis to work with everything except making a number with more than o

Question

" I can getthis to work with everything except making a number with more than one '.' invalid. What am I doing wrong? Help please.

[#include <iostream>
#include <iomanip>
#include<cstring>
#include<cctype>

using namespace std;



bool isValidDouble(char[],int);
void readDouble (char[],int);

const int Size = 10;
char Numbers [Size];

bool isValidDouble (char numbers [], int size)
{
int count;
int Deccount = 0;

for (count=0;count <Size; count ++)
{ if (isdigit(Numbers[count]))
return true;
else if (((Numbers[count]) == '.') && (Deccount == 0))
{
Deccount++;
return true;
}


else
return false;


}

}

void readDouble (char Numbers[], int Size)
{
if (isValidDouble(Numbers, Size))
cout <<"That is a valid number"<<endl;
else {cout<< "That is not valid. Please retry"<<endl;}
}
void main ()
{cout<<"Please enter a real number:"<<endl;
cin.getline(Numbers,Size);
readDouble(Numbers,Size);
}

Explanation / Answer

else if (((Numbers[count]) == '.') && (Deccount == 0))

is where your problem lies in. As the first "." is found and deccount is 0 it'll return true. so it doesn't matter how many "."s you have as long as theres one it'll return true. A way to fix that is to remove that return and check it after looping through the array and seeing if only more than 1 "." appeared.

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