Strange Error in 5Ex if: 2 3 5 2 3

.gitignore

@@ -2,17 +2,113 @@
 *.exe
 *.out
 *.o
+*.elf
+*.app
+*.bin
+*.dll
+*.so
+*.dylib
 
-# Vim files
+# Object files and build artifacts
+*.obj
+*.a
+*.lib
+*.la
+*.lo
+*.def
+*.exp
+*.pdb
+
+# Vim swap and backup files
 *~
 .*.sw*
+*.swo
+*.swn
+*.bak
 
-*output*
-
-# Clion folders and files
-cmake-build-debug/
+# IDE and editor files
 .idea/
+.vscode/
+*.sublime-workspace
+*.sublime-project
+*.code-workspace
+
+# CLion and CMake build folders
+cmake-build-debug/
+cmake-build-release/
 CMakeLists.txt
+CMakeCache.txt
+CMakeFiles/
+Makefile
+build/
+dist/
+*.cmake
+
+# Python files
+__pycache__/
+*.py[cod]
+*.egg-info/
+*.eggs/
+*.pyo
+
+# Java and Kotlin
+*.class
+*.jar
+*.war
+*.ear
+*.iml
+*.ipr
+*.iws
+.gradle/
+build/
+
+# Node.js and frontend
+node_modules/
+npm-debug.log
+yarn-error.log
+*.log
+*.lock
+*.cache/
+dist/
+out/
+coverage/
+
+# Rust
+target/
+Cargo.lock
+
+# Go
+bin/
+pkg/
+*.test
+
+# Logs and temporary files
+*.log
+*.tmp
+*.pid
+*.seed
+*.old
+*.gz
+*.tar
+*.tar.gz
+*.rar
+*.7z
+*.bak
 
 # FreeFileSync files
 *.ffs_db
+
+# macOS system files
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Windows system files
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+$RECYCLE.BIN/
+System Volume Information/
+
+# Linux system files
+lost+found/

2025.03.07/10Ex/solve.c

@@ -8,6 +8,9 @@ void matrix_multiply(const double *A, const double *B, double *c, int n, int m,
 		for (k = 0; k < m; k++)
 		{
 			for (j = 0; j < l; j++)
+			{
+				if (k == 0) c[i * l + j] = 0;
 				c[i * l + j] += A[i * m + k] * B[k * l + j];
+			}
 		}
 }

2025.03.14/4Ex/solve.c

@@ -12,7 +12,7 @@ int compare(const double a, const double b)
 
 double t4_solve(const double *A, const double *X, double *B, int m, int n)
 {
-	double maximum = -1, cur;
+	double maximum = 0, cur;
 	int i, j;
 
 	for (i = 0; i < n; i++)
@@ -23,6 +23,7 @@ double t4_solve(const double *A, const double *X, double *B, int m, int n)
 		cur = fabs(cur);
 		if (compare(cur, maximum) == 1) maximum = cur;
 	}
+
 	return maximum;
 }
 

2025.03.14/5Ex/a.txt

@@ -0,0 +1,5 @@
+1 2 3 4
+4 3 2 1
+1 2 3 4
+4 3 2 1
+1 2 3 4

2025.03.14/5Ex/array_io.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include "array_io.h"
+
+io_status read_matrix(double *a, int n, int m, const char *name)
+{
+	int i, j;
+	FILE *fp;
+	if (!(fp = fopen(name, "r"))) return ERROR_OPEN;
+	for (i = 0; i < n; i++)
+		for (j = 0; j < m; j++)
+			if (fscanf(fp, "%lf", a + i * m + j) != 1) 
+				{fclose(fp); return ERROR_READ;}
+	fclose(fp);
+	return SUCCESS;
+}
+
+void print_matrix(const double *a, int n, int m, int p)
+{
+	int np = (n > p ? p : n);
+	int mp = (m > p ? p : m);
+	int i, j;
+
+	for (i = 0; i < np; i++)
+	{
+		for (j = 0; j < mp; j++)
+			printf(" %10.3e", a[i * m + j]);
+		printf("\n");
+	}
+}
+
+void init_matrix(double *a, int n, int m, int k)
+{
+	double (*q)(int, int, int, int);
+	double (*f[])(int, int, int, int) = {f1, f2, f3, f4};
+	int i, j;
+	q = f[k-1];
+	for (i = 0; i < n; i++)
+		for (j = 0; j < m; j++)
+			a[i * m + j] = q(n, m, i+1, j+1);
+}

2025.03.14/5Ex/array_io.h

@@ -0,0 +1,11 @@
+#ifndef ARRAY_IO_H
+#define ARRAY_IO_H
+
+#include "io_status.h"
+#include "init_f.h"
+
+io_status read_matrix(double *a, int n, int m, const char *name);
+void print_matrix(const double *a, int n, int m, int p);
+void init_matrix(double *a, int n, int m, int k);
+
+#endif

2025.03.14/5Ex/b.txt

@@ -0,0 +1,4 @@
+1
+2
+3
+4

2025.03.14/5Ex/init_f.c

@@ -0,0 +1,30 @@
+#include "init_f.h"
+#include <math.h>
+
+#define MAX(n, m) (n < m ? m : n)
+
+double f1(int n, int m, int i, int j)
+{
+	return MAX(n, m) - MAX(i, j) + 1;
+}
+
+double f2(int n, int m, int i, int j)
+{
+	(void)n;
+	(void)m;
+	return MAX(i, j);
+}
+
+double f3(int n, int m, int i, int j)
+{
+	(void)n;
+	(void)m;
+	return abs(i - j);
+}
+
+double f4(int n, int m, int i, int j)
+{
+	(void)n;
+	(void)m;
+	return 1./(i+j-1);
+}

2025.03.14/5Ex/init_f.h

@@ -0,0 +1,9 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+double f1(int n, int m, int i, int j);
+double f2(int n, int m, int i, int j);
+double f3(int n, int m, int i, int j);
+double f4(int n, int m, int i, int j);
+
+#endif

2025.03.14/5Ex/io_status.h

@@ -0,0 +1,14 @@
+#ifndef IO_STATUS_H
+#define IO_STATUS_H
+
+#define LEN 1234
+
+typedef enum _io_status
+{
+	SUCCESS,
+	ERROR_OPEN,
+	ERROR_READ,
+	ERROR_MEM
+} io_status;
+
+#endif

2025.03.14/5Ex/main.c

@@ -0,0 +1,110 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include "array_io.h"
+#include "io_status.h"
+#include "solve.h"
+
+/* ./a.out n m p k_a [filename_a] k_b [filename_b] */
+int main(int argc, char *argv[])
+{
+	double t, res, *a, *b;
+	int n, m, p, k_a, k_b, task = 5;
+	char *name_a = 0, *name_b = 0;
+	if (!((argc == 6 || argc == 7 || argc == 8) && 
+				sscanf(argv[1], "%d", &n) == 1 && 
+				sscanf(argv[2], "%d", &m) == 1 && 
+				sscanf(argv[3], "%d", &p) == 1 && 
+				sscanf(argv[4], "%d", &k_a) == 1 && 
+				(k_a >= 0 && k_a <= 4) &&
+				(!(k_a == 0 && argc == 6)) && 
+				((k_a == 0 && sscanf(argv[6], "%d", &k_b) == 1) || 
+				 (k_a != 0 && sscanf(argv[5], "%d", &k_b) == 1)) &&
+				(k_b >= 0 && k_b <= 4) && 
+				(!(k_b == 0 && argc == 6)) && 
+				(!((k_a == 0 && k_b == 0) && argc != 8))))
+	{
+		printf("Usage: %s n m p k_a [filename_a] k_b [filename_b]\n", argv[0]);
+		return 1;
+	}
+	if (argc != 6) 
+	{
+		int i_b = 6;
+		if (k_a == 0) {name_a = argv[5];i_b++;}
+		if (k_b == 0) name_b = argv[i_b];
+	}
+
+	a = (double *)malloc(n * m * sizeof(double));
+	if (!a)
+	{
+		printf("Not enough memory\n");
+		return 2;
+	}
+	b = (double *)malloc(m * n * sizeof(double));
+	if (!b)
+	{
+		free(a);
+		printf("Not enough memory\n");
+		return 2;
+	}
+
+	if (name_a)
+	{ /* из файла */
+		io_status ret;
+		ret = read_matrix(a, n, m, name_a);
+		do {
+			switch (ret)
+			{
+				case SUCCESS:
+					continue;
+				case ERROR_OPEN:
+					printf("Cannot open %s\n", name_a);
+					break;
+				case ERROR_READ:
+					printf("Cannot read %s\n", name_a);
+					break;
+			}
+			free(a);
+			free(b);
+			return 3;
+		} while (0);
+	} else init_matrix(a, n, m, k_a);
+
+	if (name_b)
+	{
+		io_status ret;
+		ret = read_matrix(b, m, n, name_b);
+		do {
+			switch (ret)
+			{
+				case SUCCESS:
+					continue;
+				case ERROR_OPEN:
+					printf("Cannot open %s\n", name_b);
+					break;
+				case ERROR_READ:
+					printf("Cannot read %s\n", name_b);
+					break;
+			}
+			free(a);
+			free(b);
+			return 3;
+		} while (0);
+	} else init_matrix(b, m, n, k_b);
+
+	printf("Initial matrix A:\n");
+	print_matrix(a, n, m, p);
+	printf("Initial matrix b:\n");
+	print_matrix(b, m, n, p);
+
+	t = clock();
+	t5_solve(a, b, n, m);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+
+	printf ("%s : Task = %d Result = %e Elapsed = %.2f\n", argv[0], task, res, t);
+
+	free(a);
+	free(b);
+
+	return 0;
+}

2025.03.14/5Ex/solve.c

@@ -0,0 +1,36 @@
+#include "solve.h"
+#include "math.h"
+
+#define eps 1e-9
+
+int compare(const double a, const double b)
+{
+	if (a - b > eps) return 1;
+	else if (b - a > eps) return -1;
+	return 0;
+}
+
+double t5_solve(const double *A, const double *b, int n, int m)
+{
+	double temp, summa, maximum = 0;
+	int i, j, k;
+
+	if (n <= 0 || m <= 0) return 0;
+
+	for (i = 0; i < n; i++)
+	{
+		summa = 0;
+		for (k = 0; k < n; k++) {
+			temp = 0;
+			for (j = 0; j < m; j++)
+				temp += A[i * m + j] * b[j * n + k];
+
+			if (k == i) temp--;
+			summa += fabs(temp);
+		}
+		if (compare(summa, maximum) == 1) maximum = summa;		
+	}
+
+	return maximum;
+}
+

2025.03.14/5Ex/solve.h

@@ -0,0 +1,7 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int compare(const double a, const double b);
+double t5_solve(const double *A, const double *b, int n, int m);
+
+#endif