Please help with debug

[jdc09]

Hi, I'm having a problem with what seems to be simple math with a section of my code, I isolated the problem area so that it can be compiled on its own and I'll place it below. It should be extremely basic and I feel odd asking a question on such a small code (26 lines >_<) but I cant figure out why it isn't calculating correctly.

What I mean this section of code to do is:
1. print basic mode selected- endline
2. print please add number to be transformed- endline
3. input to double "number"
4. double transformed = (((number - 150) /100) +1)
5. print some more text, print number, print transformed.
6. if y then starts over.

but when I compile it, it doesnt seem to be calculating transformed correctly. For example ill input 4000, and the print will be:
"The transformed number for 4000 is:
-0.5"
it should have done (((4000-150) /100) +1) which would normally = 39.5
why am I getting -0.5?
help please :) , this is my code:

#include <iostream>
 
using namespace std;
 
double number;
double transformed = (((number - 150) /100)+1);
string mode_select;
string rebasic;
 
int main() {  
           basicagain:
           cout << "Basic mode selected" << endl << endl;
           cout << "Please enter number to be transformed." << endl;
           cin >> number;  
           cout << endl << "The transformed number for " << number << " is:" << endl;
           cout << transformed << endl;
           cout << "Calculate another? (Y/N)" << endl;
           cin >> rebasic;
 
               if (rebasic == "y" || rebasic == "Y") {
                  goto basicagain;
               }
}

I'm a beginner, only have been coding for about 2 weeks so any other tips would be helpful. Thanks again.

[JosAH]

Hi, I'm having a problem with what seems to be simple math with a section of my code, I isolated the problem area so that it can be compiled on its own and I'll place it below. It should be extremely basic and I feel odd asking a question on such a small code (26 lines >_<) but I cant figure out why it isn't calculating correctly.

What I mean this section of code to do is:
1. print basic mode selected- endline
2. print please add number to be transformed- endline
3. input to double "number"
4. double transformed = (((number - 150) /100) +1)
5. print some more text, print number, print transformed.
6. if y then starts over.

but when I compile it, it doesnt seem to be calculating transformed correctly. For example ill input 4000, and the print will be:
"The transformed number for 4000 is:
-0.5"
it should have done (((4000-150) /100) +1) which would normally = 39.5
why am I getting -0.5?
help please :) , this is my code:

#include <iostream>
 
using namespace std;
 
double number;
double transformed = (((number - 150) /100)+1);
string mode_select;
string rebasic;
 
int main() {  
           basicagain:
           cout << "Basic mode selected" << endl << endl;
           cout << "Please enter number to be transformed." << endl;
           cin >> number;  
           cout << endl << "The transformed number for " << number << " is:" << endl;
           cout << transformed << endl;
           cout << "Calculate another? (Y/N)" << endl;
           cin >> rebasic;
 
               if (rebasic == "y" || rebasic == "Y") {
                  goto basicagain;
               }
}

I'm a beginner, only have been coding for about 2 weeks so any other tips would be helpful. Thanks again.

It's not that a 'formula' is getting applied automagically; computer languages are
far more stupid than that. You have to do this: (I simply copied/pasted your work)

// deleted a bit ...
 
double number;
double transformed;
string mode_select;
string rebasic;
 
int main() {  
           basicagain:
           cout << "Basic mode selected" << endl << endl;
           cout << "Please enter number to be transformed." << endl;
           cin >> number;  
           cout << endl << "The transformed number for " << number << " is:" << endl;
           // the value of 'number' is known at this place so calculate now:
           transformed = (((number - 150) /100)+1);
           cout << transformed << endl;
           cout << "Calculate another? (Y/N)" << endl;
           cin >> rebasic;
 
               if (rebasic == "y" || rebasic == "Y") {
                  goto basicagain;
               }
}

kind regards,

Jos

the initial value of 'number' was 0.0 (zero) that explains why 'transformed' was -0.5