c - Handling Functions and Pointers -

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i'm not c programmer need simple poc 1 of our applications can extended c. i've got code compiling passing data straight through module , idea pass out reverse of character string passed in prove code has done data.

i have code pass each input straight output:

infa_ctsetdata(outputgroupports[i],      infa_ctgetdatastringm(inputgroupports[i]));

the infa_ctgetdatastringmfunction defined as:

char* infa_ctgetdatastringm(infa_ct_inputport_handle datahandle);

i have found function reverse string here

char *mystrrev(char *s) {    char *start = s, *t = strchr(s, '\0'); /* point end of string */    /*     * swap values @ beginning (pointed 's') , end     * (pointed 't'); 's' , 't' meet in middle.     */    ( --t/* skip terminating null character */; s < t; ++s, --t )    {       /* run-of-the-mill swap here. */       char temp = *s;       *s = *t;       *t = temp;    }    return start; }

what i'm failing pass result of call infa_ctgetdatastringm through mystrrev , on infa_ctsetdata.

infa_ctsetdata(outputgroupports[i],     mystrrev(infa_ctgetdatastringm(inputgroupports[i])));

produces these errors @ compilation

p_reverse.c:155: error: conflicting types 'mystrrev' p_reverse.c:145: error: previous implicit declaration of 'mystrrev' here

years if visual basic , c# have made life easy - can 1 me code working? i've blindly tried adding * , & different compiler errors - , i'm stumped.

p_reverse.c:155: error: conflicting types 'mystrrev' p_reverse.c:145: error: previous implicit declaration of 'mystrrev' here

implicit declaration real antifeature left on days of yore. can enable warnings/errors (or c99 mode) prevent hurting you.

on line 145, have call mystrrev , compiler has presumed declared int mystrrev(int). later, on line 155, define char *mystrrev(char *), conflicts "original" presumed int mystrrev(int).

add declaration of function before anywhere it's used (towards top of file) so:

char *mystrrev(char *val);

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