c++ - Having trouble cout-ing returned functions -

i new c++ , having trouble passing string main class of code.

my goal split below code have 2 functions other main class , @ least 1 must return value other 0.

beginning code:

#include "stdafx.h" #include <iostream> #include <iomanip>   #include <string>  using namespace std;  int _tmain(int argc, _tchar* argv[]) {     cout.precision(2);     cout.setf(ios::fixed,ios::floatfield);      float speedlimit;     float driversspeed;     float ticketamount;     float speedover;     string repeat;      /*use symbolic constant base ticket fine rate ($50).*/     const float base = 50;      start:     /*prompt user speed limit , speed of driver.*/     cout << "enter speed limit: ";      cin >> speedlimit;      cout << "enter driver's speed: ";      cin >> driversspeed;       cout << "you driving " << driversspeed << " in " << speedlimit << " mph zone.\n";          speedover = driversspeed - speedlimit;            if (speedover <= 10 && speedover >= 1)         {         ticketamount = base;         }          else if (speedover <= 14 && speedover >= 11)         {         ticketamount = (base *.05) + base;         }          else if (speedover <= 19 && speedover >= 15)         {         ticketamount = (base *.1) + base;         }          else if (speedover <= 24 && speedover >= 20)         {             ticketamount = (base *.15) + base;         }          else if (speedover <= 29 && speedover >= 25)         {             ticketamount = (base *.2) + base;         }          else if (speedover >= 30)         {         ticketamount = (base *.25) + base;         }          else         {             ticketamount = 0;         }          cout << "your fine $" << ticketamount;           cout << "\nenter y continue.  else stop: ";          cin >> repeat;          if (repeat == "y" || "y")             goto start;         else              exit(0);          return 0; } 

and here have done far:

#include "stdafx.h" #include <iostream> #include <iomanip>   #include <string>  using namespace std;  const float base = 50; float speedlimit;     float driversspeed;     float ticketamount;     float speedover;   int _tmain(int argc, _tchar* argv[]) {     cout.precision(2);     cout.setf(ios::fixed,ios::floatfield);       string repeat;      /*use symbolic constant base ticket fine rate ($50).*/       start:     /*prompt user speed limit , speed of driver.*/     cout << "enter speed limit: ";      cin >> speedlimit;      cout << "enter driver's speed: ";      cin >> driversspeed;      /*display user values input (speed limit , driver's speed) , calculated ticket fine amount. print 2 numbers after decimal point fine amount. make sure output format matches sample format.*/      cout << "you driving " << driversspeed << " in " << speedlimit << " mph zone.\n";          speedover = driversspeed - speedlimit;            cout << string(finaloutput);          /*after fine printed first speeding violation, prompt user see if he/she wants enter speeding violation. if so, prompt again speed limit , driver's speed. repeat calculation , print fine. repeat process until user indicates he/she wants stop.  user can enter either uppercase or lowercase letter y continue program.*/          cout << "\nenter y continue.  else stop: ";          cin >> string(repeat);          if (repeat == "y" || "y")             goto start;         else              exit(0);   }  float ticketamountfunc(float ticketamount) {             /*calculate ticket cost $50 (the base fine rate) plus: 0% additional if driver's speed 10 or less miles per hour above speed limit. 5% additional if driver's speed more 10 miles per hour above speed limit. 10% additional if driver's speed more 15 miles per hour above speed limit 15% additional if driver's speed more 20 miles per hour above speed limit. 20% additional if driver's speed more 25 miles per hour above speed limit. 25% additional if driver's speed 30 or more miles per hour above speed limit. not charge fine if driver wasn't speeding.*/          if (speedover <= 10 && speedover >= 1)         {         ticketamount = base;         }          else if (speedover <= 14 && speedover >= 11)         {         ticketamount = (base *.05) + base;         }          else if (speedover <= 19 && speedover >= 15)         {         ticketamount = (base *.1) + base;         }          else if (speedover <= 24 && speedover >= 20)         {             ticketamount = (base *.15) + base;         }          else if (speedover <= 29 && speedover >= 25)         {             ticketamount = (base *.2) + base;         }          else if (speedover >= 30)         {         ticketamount = (base *.25) + base;         }          else         {             ticketamount = 0;         }          return ticketamount; }  string finaloutput(string tix) {     string words = "your fine $";      //tix = words + ticketamountfunc;      tix += string(words) + string(ticketamountfunc);      return tix; } 

vs returning 2 errors:

error   1   error c2065: 'finaloutput' : undeclared identifier   error   7   error c2440: '<function-style-cast>' : cannot convert 'float (__cdecl *)(f 

loat)' 'std::string'

could please poing me in direction of error?

thank you.

edit: thank ben. moved main method , tried moving variables around declare them strings , still have undeclared identifier issue twice.

here updated code:

#include "stdafx.h" #include <iostream> #include <iomanip>   #include <string>  using namespace std;  const float base = 50; float speedlimit;     float driversspeed;     float ticketamount;     float speedover;     string ticketamountfunc(string r) {       string ticketamount;            if (speedover <= 10 && speedover >= 1)         {         ticketamount = base;         }          else if (speedover <= 14 && speedover >= 11)         {         ticketamount = (base *.05) + base;         }          else if (speedover <= 19 && speedover >= 15)         {         ticketamount = (base *.1) + base;         }          else if (speedover <= 24 && speedover >= 20)         {             ticketamount = (base *.15) + base;         }          else if (speedover <= 29 && speedover >= 25)         {             ticketamount = (base *.2) + base;         }          else if (speedover >= 30)         {         ticketamount = (base *.25) + base;         }          else         {             ticketamount = "0";         }      std::string s = ticketamount;      r = s;         return r; }  string finaloutput(string tix) {     string words = "your fine $";      //tix = words + ticketamountfunc;       tix = string() + words + ticketamountfunc(r);        return tix; }  int _tmain(int argc, _tchar* argv[]) {     cout.precision(2);     cout.setf(ios::fixed,ios::floatfield);       string repeat;      /*use symbolic constant base ticket fine rate ($50).*/       start:     /*prompt user speed limit , speed of driver.*/     cout << "enter speed limit: ";      cin >> speedlimit;      cout << "enter driver's speed: ";      cin >> driversspeed;        cout << "you driving " << driversspeed << " in " << speedlimit << " mph zone.\n";          speedover = driversspeed - speedlimit;            cout << string(finaloutput(tix));            cout << "\nenter y continue.  else stop: ";          cin >> string(repeat);          if (repeat == "y" || "y")             goto start;         else              exit(0);   } 

and errors are:

error 7 error c2065: 'r' : undeclared identifier
error 8 error c2065: 'tix' : undeclared identifier

you're trying use functions before "point of declaration". there 2 simple solutions (pick one):

1. add forward declaration aka prototype before use it.
2. move caller (main()) below functions uses.

also, when calling function, need provide arguments inside parentheses. need ticketamountfunc(ticketamount) , not ticketamountfunc.

in addition these problems, seem defining function parameters value function generates, instead of data uses. that's not useful. when use functions well, won't need global variables.