Floating type problem with turbo c++

[Parul Bagadia]

I just wrote a code for myself to clear certain things...........
When i made this program to execute in turbo c++ it didnt.....
it showed following error.
I have pasted the output after code is over.
But when i executed the same code in microsoft visual c++; it worked without showing any errors.
Can somebody tell me why that happened.

#include<stdio.h>
#include<conio.h>
void assign();
void check();
float c;
void main()
{
 int choise;
 do{
    printf("\nEnter your choise from the given menu:\n 1.Assign\n 2.Check \n 3.Exit\n");
    scanf("\n%d",&choise);
     switch(choise)
     {
      case 1:
         assign();
         break;
      case 2:
         check();
         break;
      case 3:
         break;
     }
   }while(choise!=3);
}
void check()
{
float i;
printf("%f",&c);
i=c+1;
printf("\n%f",i);
printf("\n%f",&i);
}
void assign()
{
 printf("\n Enter the value of c:\n");
 scanf("\n%f",&c);
}
 

Enter your choise from the given menu:
1.Assign
2.Check
3.Exit
1

Enter the value of c:
2

Enter your choise from the given menu:
1.Assign
2.Check
3.Exit
2
Floating point error: Domain.
Abnormal program termination

Enter your choise from the given menu:
1.Assign
2.Check
3.Exit
2
Floating point error: Domain.
Abnormal program termination

Enter your choise from the given menu:
1.Assign
2.Check
3.Exit
1

Enter the value of c:
33.4

Enter your choise from the given menu:
1.Assign
2.Check
3.Exit
2
Floating point error: Domain.
Abnormal program termination

Enter your choise from the given menu:
1.Assign
2.Check
3.Exit

[Laharl]

Since c is never initialized with a value, it simply holds whatever was left over there from the last time that memory was used. Thus, when you use it in check() before calling assign(), it has a garbage value that isn't in the domain of allowable floating-point bit patterns and thus Turbo C++ throws an error. When you ran it the next time, it had a valid leftover bit pattern through sheer luck. In short, assign c to some default value, say, 0.0 when you define it.