Variable is being used without being intialized

[todempsey]

variables F,M,A,I are not being initialized near the if statements but I thought I internalized them in the beginning of the code? Any idea where I am going wrong?

#include <iostream>
using namespace std;

int main ()

{

int weight= 0;
int calneed=0;
int F;
int M;
int I;
int A;
int otherresponse;
int response;



cout << " Type F or M for Gender:" << endl;
cin >> otherresponse;
switch (otherresponse)
{
case 1: F;
case 2: M;
}



{
cout << " Type A if your active and type I if your inactive:" << endl;
cin >> response;
switch (response)
{
case 1: A;
case 2: I;
}

}

cout << "Enter your current weight:" << endl;
cin >> weight;

switch (weight)
{
case 1: F;
case 2: A;
}

{

if ( otherresponse==F && response==A)
calneed= weight*12;
else

if ( otherresponse==F && response==I)
calneed=weight*10;
else

if (otherresponse==M && response==A)

calneed=weight*15;
else

if (otherresponse==M && I)
calneed= weight*13;

}

return 0;

}

[long double main]

int is for integers.
Use char if you want to store characters.

I don't know what you're trying to do with your switch statements.

#include <iostream>

int main()
{
    std::cout << "What is your gender? (F/M): ";
    char gender;
    std::cin >> gender;
    if (gender == 'F')
        std::cout << "You responded that you are female.";
    else if (gender == 'M')
        std::cout << "You responded that you are male.";
    else
        std::cout << "You responded that you are a '" << gender << "'. What's that?";
}

[giblit]

Ugh you are trying to use variables as characters. They are also of type int instead of char

Try replacing your switches with the letters and do what you want.

switch(response)
{
    case 'A':
        std::cout << "You entered 'A'" << std::endl;
        break;
    case 'I':
        std::cout << "You did not enter 'A' but instead 'I'" << std::endl;
        break;
    default:
        std::cout << "Invalid response." << std::endl;
}

[todempsey]

Thanks guys just started coding yesterday

[TheIdeasMan]

Hi & welcome to the forum ! :+D

No one has pointed out to you what initialisation is.

Initialisation means assigning a value to a variable:

int a = 0;

Ideally this should happen when the variable is declared. Use of un-initialised variables is one of the biggest source of errors. So this is a golden rule, to help you out :+D Make sure you initialise your variables with something. Happy days!

I think it will be handy for you to realise the difference between various types: int char double bool , and how they are stored, plus what one can do (and not do) with them.

While I am at it, and seen as it is day 2 for you, it is a great time to get you out of the habit of having using namespace std; Have a go at Googling why that is, or look at some of my recent posts. Just put std:: like giblit and long double main have done.

Just as important, please use code tags from now on: select the code, then press the <> button on the format menu.

http://www.cplusplus.com/articles/z13hAqkS/

Finally, at the top right of this page there is a great tutorial, untold reference material, and articles.

Cheers