Arguments return method is not working for float

This is a discussion on Arguments return method is not working for float within the C Programming forums, part of the General Programming Boards category; Below is the source code Code: #include<stdio.h> #include<conio.h> int main(void); float * Display(float *,float *); int main(void) { float a,b,*c; ...

  1. #1
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    Arguments return method is not working for float

    Below is the source code
    Code:
    #include<stdio.h>
    #include<conio.h>
    
    int main(void);
    float * Display(float *,float *);
    
    int main(void)
    {
       float a,b,*c;
       clrscr();
    
         printf("Enter two real numbers\n");
         scanf("%f%f",&a,&b);
    
         c=Display(&a,&b);
    
         printf("The addition is %f",*c);
    
       getch();
       return 0;
    }
    
    float * Display(float *a,float *b)
    {
       float c;
       c=*a+*b;
       return(&c);
    }

    The above progarm is not giving proper output while executing.

    Output:
    Enter two real numbers
    2.3
    3.5
    The addition is -NAN

    I am using Turbo C++ Compiler v3.0

    Plz let me know how exactly the code is.

    Thanks

  2. #2
    cph
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    it's because c is local variable and it will be destroyed as soon as the function returns.
    • return it by value (it won't hurt ), or
    • allocate (malloc()) and return

  3. #3
    Algorithm Dissector iMalc's Avatar
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    You've not allowed to return the address of a local variable.
    Just don't declare the return type, or c in main, as a pointer.
    My homepage
    Advice: Take only as directed - If symptoms persist, please see your debugger

    Linus Torvalds: "But it clearly is the only right way. The fact that everybody else does it some other way only means that they are wrong"

  4. #4
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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