Improve main function and add comments to solve()

main.c

@@ -4,8 +4,15 @@
 #include <string.h>
 #include <math.h>
 
+#define _STR(X) #X
+#define STR(X) _STR(X)
+
+#define MAX_FILE_PATH_LENGTH 256
+
 #define MAX_MATRIX_SIZE 500
-#define MAX_MATRIX_IN_FILE_SIZE MAX_MATRIX_SIZE + 2
+#define MAX_MATRIX_IN_FILE_SIZE (MAX_MATRIX_SIZE + 2)
+
+#define MAX_ITERATION_STEPS 100
 
 typedef struct {
 	int n;
@@ -29,24 +36,39 @@ typedef enum {
 	JACOBI = 0, GAUSS_SEIDEL = 1
 } Method;
 
+void flushStdin();
+
 bool load(const char* filename, Matrix* A, Vector* b, Vector* x);
 Vector* solve(Method method, Matrix* A, Vector* b, Vector* x, double e);
 
 int readMatrixLine(FILE* file, double* matrixLine, int maxCols);
 
 int main(int argc, char* argv[]) {
+	char filePath[MAX_FILE_PATH_LENGTH];
+
+	if(argc >= 2) {
+		strncpy(filePath, argv[1], MAX_FILE_PATH_LENGTH);
+	} else {
+		puts("Please enter the path of the file you'd like to open");
+		int result = scanf("%" STR(MAX_FILE_PATH_LENGTH) "[^\n]", filePath);
+		if(result == EOF || result == 0 || filePath[0] == 0) {
+			return 0;
+		}
+		if(result != 1) {
+			puts("Couldn't read file path - stopping");
+			return 1;
+		}
+		flushStdin();
+	}
+
 	Matrix* matrix = createMatrix();
 	Vector* b = createVector();
 	Vector* x = createVector();
 
-	puts("Allocated ram");
 	int returnCode = 0;
 
-	if(argc != 2) {
-		puts("Program should be called with 1 argument specifying the file to load from\n");
-		returnCode = 1;
-	} else {
-		if(load(argv[1], matrix, b, x)) {
+	while(true) {
+		if(load(filePath, matrix, b, x)) {
 			puts("Data successfully loaded\nMatrix A:");
 			printMatrix(matrix);
 			puts("Vector b:");
@@ -56,12 +78,24 @@ int main(int argc, char* argv[]) {
 
 			Vector* result = solve(JACOBI, matrix, b, x, 0.00001);
 			free(result);
+			break;
 		} else {
-			puts("Failed to load data from file");
-			returnCode = 2;
+			puts("Failed to load data from file.\nEnter new file path or press ctrl-c to exit");
+
+			int result = scanf("%" STR(MAX_FILE_PATH_LENGTH) "[^\n]", filePath);
+			if(result == EOF || result == 0 || filePath[0] == 0) {
+				goto end;
+			}
+			if(result != 1) {
+				puts("Couldn't read file path - stopping");
+				returnCode = 1;
+				goto end;
+			}
+			flushStdin();
 		}
 	}
 
+end:
 	freeMatrix(matrix);
 	freeVector(b);
 	freeVector(x);
@@ -70,7 +104,6 @@ int main(int argc, char* argv[]) {
 	return returnCode;
 }
 
-
 bool load(const char* filename, Matrix* matrix, Vector* b, Vector* x) {
 	FILE* file = fopen(filename, "r");
 	if(file == NULL) {
@@ -127,11 +160,11 @@ bool load(const char* filename, Matrix* matrix, Vector* b, Vector* x) {
 						}
 						goto success;
 					} else {
-						printf("Line %i contains illegal formatting - please fix!\n", i);
+						printf("Line %i contains illegal formatting - please fix!\n", i + 1);
 						goto failure;
 					}
 				} else if(colsInLine != colsInFile) {
-					printf("Illegal line length found in line %i\n", i);
+					printf("Illegal line length found in line %i\n", i + 1);
 					goto failure;
 				} else {
 					b->data[i] = matrix->data[i][cols];
@@ -151,7 +184,6 @@ success:
 failure:
 	fclose(file);
 	return false;
-
 }
 
 
@@ -177,11 +209,22 @@ int readMatrixLine(FILE* file, double* matrixLine, int maxCols) {
 	return col;
 }
 
+void flushStdin() {
+	int c;
+	while((c = getchar()) != '\n' && c != EOF && c != 0);
+}
+
 Vector* solve(Method method, Matrix* A, Vector* b, Vector* x, double e) {
-	Vector* vectors = malloc(sizeof(Vector)*100); 
+	Vector* vectors = malloc(sizeof(Vector) * (MAX_ITERATION_STEPS + 1)); 
+
+	// MAX_ITERATION_STEPS enthält die maximal zulässige Anzahl an Iterationsschritten (100)
+	// Die einzelnen Vektoren müssen noch mit initVector initialisiert werden
+
+
+	// HIER kommt der Code hin ;)
 
 	// on success
-	// Bitte setzt vectors[n+1].n = 0
+	// Sei x die Anzahl der durchgeführten Iterationschritte. Dann setzt vectors[x+1].n = 0. Damit weiß das folgende Programm wie viele Schritte getätigt wurden.
 	return vectors;
 
 	// on failure