Сделал 45 Задание

45Ex/input.txt

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+1
+2
+3
+4
+5

45Ex/main.c

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+#include <stdio.h>
+#include "tools.h"
+#include "solve_polynomial.h"
+
+/*
+Problem 45
+Coordinate X: 2
+Solution: 129
+Derivative: 222
+*/
+
+int main(void) {
+    double derivative, polynomial, x;
+    FILE * file = getFile();
+    if (file == NULL) return 1;
+
+    printf("Enter x coordinat: ");
+    scanf("%lf", &x);
+
+    if (solvePolynomial(file, x, &derivative, &polynomial)) return 1;
+    printf("Solve of the polynomial is %lf\nSolve of its derivative is %lf\n", polynomial, derivative);
+    return 0;
+}

45Ex/makefile

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+all: main.o solve_polynomial.o tools.o
+	gcc main.o solve_polynomial.o tools.o && del *.o
+	
+main.o: main.c
+	gcc -c main.c
+
+solve_polynomial.o: solve_polynomial.c
+	gcc -c solve_polynomial.c
+
+tools.o: tools.c
+	gcc -c tools.c

45Ex/solve_polynomial.c

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+#include "solve_polynomial.h"
+
+int solvePolynomial(FILE * file, double x, double * derivative, double * polynomial) {
+    double current, i;
+
+    if (fscanf(file, "%lf", &current) != 1) {
+        printf("File is empty!\n");
+        return 1;
+    }
+
+    *derivative = *polynomial = i = 0.;
+
+    do {
+        *polynomial += current * pow(x, i);
+        *derivative += i * current * pow(x, i - 1);
+        i++;
+    } while (fscanf(file, "%lf", &current) == 1);
+
+    return 0;
+}

45Ex/solve_polynomial.h

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+#ifndef SOLVE_POLYNOMIAL
+#define SOLVE_POLYNOMIAL
+
+#include <stdio.h>
+#include <math.h>
+
+int solvePolynomial(FILE * file, double x, double * derivative, double * polynomial);
+
+#endif // SOLVE_POLYNOMIAL

45Ex/tools.c

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+#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;
+    }
+}

45Ex/tools.h

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+#ifndef TOOLS
+#define TOOLS
+
+#include <stdio.h>
+
+FILE * getFile(void);
+
+#endif