c - Simple pass a pointer to another function FAILED -

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i keep getting runtime error when trying pass input[i] function... don't know why. it's supposed pass address of input[i] pointer in other function don't know went wrong. must simple failed catch...

edit: program stop before passing array , exit.

void processinfixexp(const char * filename) {     char ** input = null, ** output = null;     int = 0, numinput = 0;     char len;     char tempinput[100] = {0};     file * pfile = null;     if((pfile = fopen(filename, "r")) == null)     {         printf("cannot read file %s\n", filename);         system("pause");         exit(1);     }     while(fgetc(pfile) == '\n')         ++numinput;     /* printf("%d\n", numinput); */     input = (char**)malloc(numinput * sizeof(char*));     output = (char**)malloc(numinput * sizeof(char*));     if(!input || !output)     {         printf("memory allocation failed.\n");         system("pause");         exit(1);     }     rewind(pfile);     for(i = 0; fgets(tempinput, maxl, pfile) != null; ++i)     {         /* printf("%s\n", tempinput); */         len = strlen(tempinput);         while(len && tempinput[len-1])             tempinput[len-1] = '\0';         input[i] = strdup(tempinput);         printf("%s\n", input[i]); /* printf success */     }     fclose(pfile);     (i = 0; < numinput; ++i)      {         convertintopost (input[i], &output[i]);         printf (" input[%2zu]: %-25s  output[%2zu]: %s\n", i, input[i], i, output[i]);     }     free(input), free(output); } void convertintopost(char * in, char ** out) /* test passing input[] */ {     printf("%s", in); /* no success */ }

it looks convertintopost expected assign output[i] indirecting through out parameter receives. if haven't gotten around adding part of it, still need initialize pointer, printf in caller succeed.

void convertintopost(char * in, char ** out) /* test passing input[] */ {     printf("%s", in); /* no success */     *out = strdup(""); }

also, before free(input) , free(output), need free strings point to, otherwise they'll orphaned.

for (i = 0; < numinputs; i++) {     free(input[i]);     free(output[i]); } free(input); free(output);

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