new to C , error C2371: 'error" : redefinition; diffrent basic types -
i've submit assigment in few hours , i'm nervous, it's sort of gas station managing programs, handeling input files, , printing results... it's 1 .c file , that's first code lines, defines structs
#include <stdio.h> #include <string.h> #include <stdlib.h> struct gas_station *pgasstationhead = null; typedef struct gas_station { char *name; double octan95ss; double octan95fs; double octan98ss; double octan98fs; double gassoldtotal; double gassoldss; double gassoldfs; struct gas_station* pgasstationnext; struct client_list* pclienthead; } station; typedef struct client_list { char carid[10]; char gastype[3]; double gasamount; char servicetype[12]; struct client_list* pclientnext; } client; and problematic functions , main :
void commandsswitch(char *orders) { file *input , *output; input = fopen(orders, "rt"); output = fopen("result.txt" , "wt"); if (input == null) { error("can't open file, might not exists"); } else if (output == null) { error("can't open file"); } else { { int i; char *ptemp, *pfuncnum, *pcarid , *pstationname; ptemp = fgets(ptemp , 80 , input); if (ptemp[0] != '#') { pfuncnum = strtok(ptemp , ","); = (int)pfuncnum[0]; switch (i) { case 1: howmuchgasperstation(output); break; case 2 : pstationname = strtok(pstationname , ","); averagegasinspecieficstation(output , pstationname); break; case 3 : howmuchgasinallstations(output); break; case 4 : howmuchgasfsinallstations(output); break; case 5 : pcarid = strtok(ptemp , ","); howmuchgassoldbycarid(output , pcarid); break; case 6 : pcarid = strtok(ptemp , ","); pstationname = strtok(pstationname , ","); howmuchgassoldbystationpercarid(output , pcarid , pstationname); break; case 7 : pcarid = strtok(ptemp , ","); stationswithclientbycarid(output , pcarid); break; case 8 : pcarid = strtok(ptemp , ","); pstationname = strtok(pstationname , ","); howmuchclientspentbystation(output , pcarid , pstationname); break; case 9 : pcarid = strtok(ptemp , ","); howmuchclientspentintotalbycarid(output , pcarid); break; case 10 : pstationname = strtok(pstationname , ","); clientdetailsbyspecieficstation(output , pstationname); break; } } }while(!feof(input)); } fclose(input); fclose(output); } static void error(char *msg) { fprintf(stderr , "error: %s\n", msg); exit(1); } int main (int argc, char* argv[]) { int i; file *f; char *orders = argv[1]; (i = 2; < argc; i++) { f = fopen(argv[i] , "rt"); if (f == null) { error("can't open file, might not exists"); } else { addstation(f); } fclose(f); } commandsswitch(orders); } now error points static void error(char *msg) function before pointed void commandsswitch(char *orders), commandsswitch give same error.
plz try , guide me, i'm confused. tnx.
one of problems use of error function in commandswitch.
void commandsswitch(char *orders) { file *input , *output; input = fopen(orders, "rt"); output = fopen("result.txt" , "wt"); if (input == null) { error("can't open file, might not exists"); } else if (output == null) { error("can't open file"); } /* ...more... */ you use error function before actual declaration of error function further down:
static void error(char *msg) { fprintf(stderr , "error: %s\n", msg); exit(1); } you ran implicit function declaration feature of c, allows use function if implicitly declared, not using function prototypes.
to compiler, acts though there's function declared as
int error(...); which conflict function:
static void error(char *); so basically, code acts though there function called error declared, , default return type of int. compiler run void error() function declaration, , complain there redefinition of function error.
the easiest method fix issue, @ least, move error function before void commandsswitch.
you want read function declarations , prototypes:
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