Benötige Hilfe - malloc, free
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Hallo,
habe ein Problem mit dem folgenden Code.
Kann mir jemand sagen, weshalb beim Aufruf der Funktion getBoundaryConditions immer die Fehlermeldung "Nicht deklarierter Bezeichner an, ae, aw, ..." entsteht?
#include <stdlib.h> #include <stdio.h> #include <string.h> #include <math.h> #include <windows.h> // Globale Konstanten const int max = 500; struct Coords { double x; double y; }; // ****************************************************************************************************************************** void gotoxy(int x, int y) { COORD coords; HANDLE Hnd = GetStdHandle(STD_OUTPUT_HANDLE); if (Hnd == INVALID_HANDLE_VALUE) return; coords.X = (x - 1); coords.Y = (y - 1); SetConsoleCursorPosition(Hnd, coords); } // ****************************************************************************************************************************** void swap(double* ptr1, double* ptr2) { double tmp = *ptr1; *ptr1 = *ptr2; *ptr2 = tmp; } // ****************************************************************************************************************************** int getSteeringInfo(FILE* sfileptr, char* gFilename, char* bFilename, int* blocks, int* imax, int* jmax) { char buffer[max]; int counter = 0; int RetVal = 0; while (!feof(sfileptr)) { fgets(buffer, max, sfileptr); if (buffer[0] != '#') { counter++; switch (counter) { case 1: // Parse den Gitterdateinamen if (sscanf(buffer,"%s", gFilename) != 1) { printf(">> Error parsing grid-filename: %s\n\n", gFilename); RetVal = 1; } break; case 2: // Parse Gitterdimensionen if (sscanf(buffer,"%d %d", imax, jmax) != 2) { printf(">> Error undefined grid-dimension (Imax: %d, Jmax: %d)\n\n", *imax, *jmax); RetVal = 2; } break; case 3: // Parse Gitterdimensionen if (sscanf(buffer,"%d", blocks) != 1) { printf(">> Error undefined block-number (blocks: %d)\n\n", *blocks); RetVal = 3; } break; case 4: // Parse den Gitterdateinamen if (sscanf(buffer,"%s", bFilename) != 1) { printf(">> Error parsing grid-filename: %s\n\n", bFilename); RetVal = 1; } break; } } else { // Ignoriere Zeile als Kommentar } } return RetVal; } // ****************************************************************************************************************************** int getBoundaryConditions(FILE* bfileptr, double* an, double* ae, double* ap, double* as, double* aw, double* ST, int imax, int jmax) { char buffer[max]; int btype; int ij; double param; // WEST-BOUNDARY ij = 1; do { fgets(buffer, max, bfileptr); if (buffer[0] != '#') { if (sscanf(buffer,"%d %lf", btype, param) != 2) { if (btype == 1) { // DIRICHLET-RANDBEDINGUNGEN ST[ij] = param; ap[ij] = 1; ae[ij] = 0; aw[ij] = 0; an[ij] = 0; as[ij] = 0; } ij++; } } } while (ij <= imax); // EAST-BOUNDARY // SOUTH-BOUNDARY // NORTH-BOUNDARY return 0; } // ****************************************************************************************************************************** int getGridInfo(FILE* gfileptr, Coords* xyCoords, int imax, int jmax) { char buffer[max]; double val1, val2; int i = 0; int RetVal = 0; while ((!feof(gfileptr)) && (i < imax*jmax)) { fgets(buffer, max, gfileptr); if (buffer[0] != '#') { if (sscanf(buffer,"%lf %lf", &val1, &val2) != 2) { xyCoords[i].x = val1; xyCoords[i].y = val2; i++; } else { RetVal = i; } } else { // Kommentar interpretieren } } return RetVal; } // ****************************************************************************************************************************** void main(void) { char sFilename[256] = "steering.dat"; char gFilename[256] = ""; char bFilename[256] = ""; // Dimensionen der Computation-Matrix int imax=0, jmax=0, blocks =0; int RetVal; FILE* gfileptr; FILE* sfileptr; FILE* bfileptr; printf("--------------------------------------------------------------------------------"); printf("> Computation-Steering: %s\n", sFilename); printf("--------------------------------------------------------------------------------\n\n"); printf("--------------------------------------------------------------------------------"); printf("> GRID-INFORMATION:\n"); printf("--------------------------------------------------------------------------------"); sfileptr = fopen(sFilename, "r"); if (sfileptr != NULL) { // Steuerungsdatei wurde gefunden RetVal = getSteeringInfo(sfileptr, gFilename, bFilename, &blocks, &imax, &jmax); if (RetVal == 0) { printf("Grid-filename: %s\n", gFilename); printf("Imax : %d Pts.\n", imax); printf("Jmax : %d Pts.\n", jmax); printf("Blocks : %d\n\n", blocks); printf("--------------------------------------------------------------------------------"); printf("> BOUNDARY-CONDITIONS:\n"); printf("--------------------------------------------------------------------------------"); printf("BC-filename : %s\n", bFilename); printf("--------------------------------------------------------------------------------"); gfileptr = fopen(gFilename, "r"); if (gfileptr != NULL) { // Allokiere Speicher für die A-Matrix Coords *xyCoords = (Coords*) malloc(sizeof(Coords)*imax*jmax); // Einlesen der Gitterpunktkoordinaten RetVal = getGridInfo(gfileptr, xyCoords, imax, jmax); if (RetVal > 0) { printf(">> Wrong grid-format in line %d...\n", RetVal); } else { // Allokiere Speicher für die Koeffizienten an, ae, ap, as, aw und den Quellterm ST double* an = (double*) malloc(sizeof(double)*imax*jmax); double* ae = (double*) malloc(sizeof(double)*imax*jmax); double* ap = (double*) malloc(sizeof(double)*imax*jmax); double* as = (double*) malloc(sizeof(double)*imax*jmax); double* aw = (double*) malloc(sizeof(double)*imax*jmax); double* ST = (double*) malloc(sizeof(double)*imax*jmax); an[0] = 1; // Allokiere Speicher für den T-Vektor double *T = (double*) malloc(sizeof(double)*imax); // Allokiere Speicher für den y-Vektor double *y = (double*) malloc(sizeof(double)*imax); } // Einlesen der Randbedingungen bfileptr = fopen(bFilename, "r"); if (bfileptr != NULL) { RetVal = getBoundaryConditions(bfileptr, an, ae, ap, as, aw, ST, imax, jmax); fclose(bfileptr); } else { printf(">> Unable to read boundary-conditions...\n\n"); } // ----------------------------------------------------------------------------------- // Speicher wieder freigeben // ----------------------------------------------------------------------------------- //free(an); //free(ae); //free(ap); //free(as); //free(aw); //free(ST); free(xyCoords); // Datei schließen fclose(gfileptr); } else { // Grid-Datei konnte nicht gefunden werden printf(">> Could not open gridfile...\n"); } } else { // Fehler beim einlesen der Steuerungsdatei printf(">> Exit program...\n\n"); } fclose(sfileptr); } else { // Steuerungsdatei konnte nicht gefunden werden printf(">> Could not find file <%s> in directory.\n>> Exit program...\n\n", sFilename); } }
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/* ... */ } else { double* an = (double*) malloc(sizeof(double)*imax*jmax); double* ae = (double*) malloc(sizeof(double)*imax*jmax); /* snip */ } // Einlesen der Randbedingungen bfileptr = fopen(bFilename, "r"); if (bfileptr != NULL) { RetVal = getBoundaryConditions(bfileptr, an, ae, ap, as, aw, ST, imax, jmax); fclose(bfileptr); /* ... */... weil diese nur im else-Block deklariert sind! Deklarier die pointer besser irgendwo ausserhalb ...
grüße