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# 1  
Old 10-01-2013
Main.c:(.text+0x55): undefined reference to
I'm getting this error. I'm guessing either there is an error in my code or I am missing a library. Can I please have some ideas on what the problem is?

Code:
main.c:(.text+0x55): undefined reference to

Code:
$ gcc *.c
/tmp/ccP8MDTO.o: In function `getInput':
main.c:(.text+0x55): undefined reference to `validateInput'
main.c:(.text+0xb2): undefined reference to `validateInput'
main.c:(.text+0x10f): undefined reference to `validateInput'
collect2: ld returned 1 exit status

Code:
bool getInput (int* pFahrenheit, int* pFeet, int* pPounds)
{
    bool isValid=false;
    //Prompt for Temperature
    int count=scanf("%d",pFahrenheit);
    if(count==1)
    {
        if (validateInput(*pFahrenheit,0,212))
        {
            isValid=true;
        }
    }
}

# 2  
Old 10-01-2013
Quote:
Originally Posted by cokedude
I'm getting this error. I'm guessing either there is an error in my code or I am missing a library. Can I please have some ideas on what the problem is?

Code:
main.c:(.text+0x55): undefined reference to

Code:
$ gcc *.c
/tmp/ccP8MDTO.o: In function `getInput':
main.c:(.text+0x55): undefined reference to `validateInput'
main.c:(.text+0xb2): undefined reference to `validateInput'
main.c:(.text+0x10f): undefined reference to `validateInput'
collect2: ld returned 1 exit status

Code:
bool getInput (int* pFahrenheit, int* pFeet, int* pPounds)
{
    bool isValid=false;
    //Prompt for Temperature
    int count=scanf("%d",pFahrenheit);
    if(count==1)
    {
        if (validateInput(*pFahrenheit,0,212))
        {
            isValid=true;
        }
    }
    return(isValid);
}

Most importantly, the diagnostics you're getting say that you have at least three calls to a function named validateInput() that is not defined in your source file and is not included in any of the libraries you're linking. One of those calls is in the function you included above. Where is the function validateInput() defined?

Once you fix that, note that you have declared that your getInput() function returns an object of type bool, but the code doesn't return any value. I assume that you want to add a line of code similar to the line in red I added above.
This User Gave Thanks to Don Cragun For This Post:
cokedude
# 3  
Old 10-06-2013
Quote:
Originally Posted by Don Cragun
Most importantly, the diagnostics you're getting say that you have at least three calls to a function named validateInput() that is not defined in your source file and is not included in any of the libraries you're linking. One of those calls is in the function you included above. Where is the function validateInput() defined?

Once you fix that, note that you have declared that your getInput() function returns an object of type bool, but the code doesn't return any value. I assume that you want to add a line of code similar to the line in red I added above.
Thank you. validateInput() is not defined anywhere.

Yes your right I need to return that.

Is the bool getInput declaration ok? It took me awhile to figure out a way to use it and the compiler not give me an error. I wasn't able to find very much c programming documentation on a bool function. I eventually did this since I saw it recommended several times when I googled it.

Code:
#define bool int
#define true 1
#define false 0

[SOLVED] Boolean variables in C
# 4  
Old 10-06-2013
Quote:
Originally Posted by cokedude
Thank you. validateInput() is not defined anywhere.

Yes your right I need to return that.

Is the bool getInput declaration ok? It took me awhile to figure out a way to use it and the compiler not give me an error. I wasn't able to find very much c programming documentation on a bool function. I eventually did this since I saw it recommended several times when I googled it.

Code:
#define bool int
#define true 1
#define false 0

[SOLVED] Boolean variables in C
If you have a C programming environment that conforms to the 1999 C standard, you should include the stdbool header:
Code:
#include <stdbool.h>

before using bool, true, and false in your program. If you include that header, bool is defined to be an appropriate type and true and false will be defined appropriately for your programming environment. If your compiler provides stdbool.h, you should not use #defines to define bool, false, and true; you should use #include <stdbool.h> instead.
This User Gave Thanks to Don Cragun For This Post:
niterobin
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