I keep getting an error with my solution because I cant use strtof in visual studio d

[zorse03]

I keep getting an error with my solution because I cant use strtof in visual studio due to not being supported. I get an error saying is undefined on line 28. Is there anything i can use to run this program properly.


Ch9_Ex4Data.txt . The input text file is
Plain Egg
1.45
Bacon and Egg
2.45
Muffin
0.99
French Toast
1.99
Fruit Basket
2.49
Cereal
0.69
Coffee
0.50
Tea
0.75.




#include<iostre am>
#include<cstdli b>
#include<string >
#include<fstrea m>
#include<stdlib .h>

using namespace std;
struct menuItem
{
string item;
float price;
int quantity;
};
menuItem* breakfastMenu = new menuItem[8];

void getData()
{
ifstream myfile ("Ch9_Ex4Data.t xt");
if (myfile.is_open ())
{
string line;
int i=0,flag=1;
while ( getline (myfile,line) )
{
if(flag){
breakfastMenu[i].item = line;
flag=0;
}
else{
breakfastMenu[i++].price = (float)strtof(l ine.c_str(),NUL L);
flag=1;
}
}
}
else cout << "Unable to open file";
myfile.close();
}
void printCheck()
{
float billAmount;
for(int i=0;i<8;i++)
{
if(breakfastMen u[i].quantity > 0)
{
cout< billAmount += breakfastMenu[i].quantity * breakfastMenu[i].price;
}
}
cout<<"Amount Due $"< }

void showMenu()
{
int num,quantity;
char c;
for(int i=0;i<8;i++)
cout<<(i+1) <<". " < cout<<"What would you like to have?"< cin>>num;
cout<<"Quantity ?"< cin>>quantity;
breakfastMenu[num-1].quantity = quantity;
cout<<"Print check?(y/n)"< cin>> c;
if(c=='Y' || c=='y')
printCheck();
else
showMenu();
}


int main()
{
getData();
showMenu();
system("pause") ;
return 0;
}

[weaknessforcats]

Did you mean strtok?

[zorse03]

No I need string to float. I try using strtod, however since strtod, which is string to digit and billAmount is float type. I get an billAmount is used without being initialized.

[zorse03]

No I need string to float. I try using strtod, however since strtod, is string to digit and billAmount is float type. I get an billAmount is used without being initialized.

[weaknessforcats]

First of all, the code does not compile. There's little I can do until it compiles.

Some problems are:

cout< billAmount += breakfastMenu[i].quantity * breakfastMenu[i].price;

The operator for cout is << and not <.

While billAmount can be displayed, += cannot. Do the calculation before the cout statement and just display the result.

cout<<"Amount Due $"<

Did you mean ; instead of the <?

There are other places with the same sort of problem.

Nothing I could see had anything to do with strtof.

[zorse03]

#include<iostre am>
#include<cstdli b>
#include<string >
#include<fstrea m>

using namespace std;
struct menuItem
{
string item;
float price;
int quantity;
};
menuItem* breakfastMenu = new menuItem[8];

void getData()
{
ifstream myfile ("Ch9_Ex4Data.t xt");
if (myfile.is_open ())
{
string line;
int i=0,flag=1;
while ( getline (myfile,line) )
{
if(flag)
{
breakfastMenu[i].item = line;
flag=0;
}
else
{
breakfastMenu[i++].price = (float)strtof(l ine.c_str(),NUL L);
flag=1;
}
}
}
else cout << "Unable to open file";
myfile.close();
}
void printCheck()
{
float billAmount;
for(int i=0;i<8;i++)
{
if(breakfastMen u[i].quantity > 0)
{
cout<<breakfast Menu[i].quantity<<"\t" <<breakfastMe nu[i].item<<"\t$"<<b reakfastMenu[i].price<<endl;
billAmount += breakfastMenu[i].quantity * breakfastMenu[i].price;
}
}
cout<<"Amount Due $"<<billAmou nt;
}

void showMenu()
{
int num,quantity;
char c;
for(int i=0;i<8;i++)
cout<<(i+1) <<". " <<breakfastMe nu[i].item << " $"<<breakfastMe nu[i].price<<endl;
cout<<"What would you like to have?"<<endl;
cin>>num;
cout<<"Quantity ?"<<endl;
cin>>quantity;
breakfastMenu[num-1].quantity = quantity;
cout<<"Print check?(y/n)"<<endl;
cin>> c;
if(c=='Y' || c=='y')
printCheck();
else
showMenu();
}


int main()
{
getData();
showMenu();
system("pause") ;
return 0;
}

[zorse03]

This is the error

\consoleapplica tion1\source.cp p(31): error C3861: 'strtof': identifier not found

[weaknessforcats]

What Visual Studio are you using?

I'm using Visual Studio 2013 and strtof is not causing an error.

I just get a warning that billAmount on line 47 is being used without being initialized.

[zorse03]

IM using visual studio 2012, i switch strtof with strtod, then i got that warning as well on line 47. How can i fix that warning?

[weaknessforcats]

Just initialize billAmount to 0.0f to remove the line 47 warning:

float billAmount = 0.0f;

I don't get any error using strtof or strtod.

What s your error exactly?

[zorse03]

what line do i put the initialize billAmount at?

[zorse03]

Thanks for the help, it worked