Сделал задание 37

Fifth/get_file.c

@@ -0,0 +1,23 @@
+#include "get_file.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;
+    }
+}

Fifth/get_file.h

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

Fifth/input.txt

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

Fifth/main.c

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+#include <stdio.h>
+#include "get_file.h"
+#include "max_deviation.h"
+
+/*
+Çàäàíèå 37
+*/
+
+int main(void) {
+    FILE * file = getFile();
+    if (file == NULL) return -1;
+    printf("The standard deviation from the arithmetic mean is equal to %d", maxDeviation(file));
+    return 0;
+}

Fifth/makefile

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+all: main.o max_deviation.o get_file.o
+	gcc main.o max_deviation.o get_file.o && del *.o
+
+main.o: main.c
+	gcc -c main.c
+
+max_deviation.o: max_deviation.c
+	gcc -c max_deviation.c
+
+get_file.o: get_file.c
+	gcc -c get_file.c

Fifth/max_deviation.c

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+#include "max_deviation.h"
+
+int ipow(int number, int power) {
+    int result = 1;
+    for (int i = 0; i < power; i++) result *= number;
+    return result;
+}
+
+int maxDeviation(FILE * file) {
+   int current, sq_sum, sum, count, ar_mean;
+   if (fscanf(file, "%d", &current) != 1) {
+        printf("File is empty!");
+        return -1;
+   }
+
+   sq_sum = sum = count = 0;
+
+   do {
+        sum += current;
+        sq_sum += ipow(current, 2);
+        count++;
+   } while (fscanf(file, "%d", &current) == 1);
+
+   ar_mean = sum / count;
+   return ((sq_sum - (sum * ar_mean * 2)) / count) + ipow(ar_mean, 2);
+}

Fifth/max_deviation.h

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+#ifndef MAX_DEVIATION
+#define MAX_DEVIATION
+
+#include <stdio.h>
+
+int ipow(int number, int power);
+int maxDeviation(FILE * file);
+
+#endif // MAX_DEVIATION