Исправил третье задание, теперь максимум высчитывается верно

46Ex/main.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include "tools.h"
+
+int solutionPolynomial(FILE * file, double x, double * &derivative, double * &polynomial)
+
+int main(void) {
+    double x, derivative, polynomial;
+    FILE * file = getFile();
+    if (file == NULL) return 1;
+
+    printf("Enter the x cordinate: ");
+    scanf("%lf", &x);
+}

46Ex/tools.c

@@ -0,0 +1,23 @@
+#include "tools.h"
+
+FILE * getFile(void)
+{
+    FILE * file;
+    char filename[50];
+
+    printf("Enter filename: ");
+    if (scanf("%s", filename) == 1)
+    {
+        file = fopen(filename, "r");
+        if (file == NULL) {
+            printf("Error file!\n");
+            return NULL;
+        } else {
+            return file;
+        }
+    } else
+    {
+        printf("Empty name!\n");
+        return NULL;
+    }
+}

46Ex/tools.h

@@ -0,0 +1,8 @@
+#ifndef TOOLS
+#define TOOLS
+
+#include <stdio.h>
+
+FILE * getFile(void);
+
+#endif

Third/count_max_local.c

@@ -21,7 +21,7 @@ int getCountMaxLocal(FILE *file) {
 
     while (fscanf(file, "%d", &current_n) == 1) {
         if (last == current_n) {
-            length += 1;
+            if (length) length++;
         } else {
             if (last > current_n) {
                 maxLen = max(maxLen, length);