Compile Error:

here's my compile error.

Code:

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$ cc fig07_10.c
/tmp/cc5AugyJ.o: In function `main':
fig07_10.c:(.text+0x69): undefined reference to `convertToUpperCase'
collect2: ld returned 1 exit status

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Code:

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#include <stdio.h>
#include <ctype.h>

void convertToUpperCase( char * );


int main()
{
        char string[] = "characters and $32.98";

        printf( "The string before conversion is: &#37;s", string );
        convertToUpperCase( string );
        printf( "\nThe string after conversion is: %s\n", string );
        printf( "\nThe string after conversion is: %s\n",  string );

        return 0;
}



void convertToUppercase( char *sPtr )
{
        while ( *sPtr != '\0' ) {
                if ( islower( *sPtr ) )
                        *sPtr = toupper( *sPtr );

                ++sPtr;
        }
}

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I think gcc needs an extra argument but I don't understand why or what it is.

Quote:

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Originally Posted by yougene

Code:

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void convertToUpperCase( char * );
void convertToUppercase( char *sPtr )

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Compare and contrast.

Code:

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void convertToUpperCase( char * );

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...should also be...

Code:

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void convertToUpperCase(char* sPtr);

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Anything else is just bad practice. Do not leave out the parameter names in the prototypes.