Task 8 is done

2025.05.09/08Ex/Makefile

@@ -0,0 +1,42 @@
+WFLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused \
+-Wempty-body -Wlogical-op -Wold-style-declaration -Wmissing-parameter-type \
+-Wignored-qualifiers -Winit-self -Wshadow -Wtype-limits \
+-Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 \
+-Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs \
+-Wmissing-prototypes -Wmissing-declarations -Wold-style-definition \
+-Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal \
+-Wwrite-strings -Wno-long-long -std=gnu99 -Wstrict-prototypes \
+-Wmissing-field-initializers -Wpointer-sign
+
+LDFLAGS = -std=gnu99 -mfpmath=sse -O3
+LDLIBS = -lm
+
+ifeq ($(OS),Windows_NT)
+	EXE = exe
+	CLEAN = del
+	LDLIBS += -lssp
+else
+	EXE = out
+	CLEAN = rm -f
+endif
+
+TARGET = a08.$(EXE)
+OBJ = main.o solve.o
+
+%.o: %.c
+	gcc $(WFLAGS) $(LDFLAGS) -c $< -o $@
+
+$(TARGET): $(OBJ)
+	gcc $^ -o $@ $(LDLIBS)
+
+# Отладочная сборка (gdb)
+gdb: LDFLAGS = -std=gnu99 -mfpmath=sse -g -O0
+gdb: clean $(TARGET)
+
+# Профилировочная сборка (gprof)
+prof: LDFLAGS += -pg
+prof: LDLIBS += -pg
+prof: clean $(TARGET)
+
+clean:
+	$(CLEAN) *.o *.$(EXE)

2025.05.09/08Ex/init_f.h

@@ -0,0 +1,66 @@
+#ifndef INIT_F_H
+#define INIT_F_H
+
+#include <math.h>
+
+static int cl = 0;
+
+static inline int get_call_count (void) 
+{
+	return cl;
+}
+
+static inline double f0 (double x)
+{
+	cl++;
+	(void)x;
+
+	return 1;
+}
+
+static inline double f1 (double x)
+{
+	cl++;
+	return x + 1;
+}
+
+static inline double f2 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+	return x_2 + x + 1;
+}
+
+static inline double f3 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	cl++;
+
+	return x_3 + x_2 + x + 1;
+}
+
+static inline double f4 (double x)
+{
+	double x_2 = x * x;
+	double x_3 = x_2 * x;
+	double x_4 = x_3 * x;
+	cl++;
+
+	return x_4 + x_3 + x_2 + x + 1;
+}
+
+static inline double f5 (double x)
+{
+	cl++;
+	return exp(-x);
+}
+
+static inline double f6 (double x)
+{
+	double x_2 = x * x;
+	cl++;
+	return 1 / (25 * x_2 + 1);
+}
+
+#endif

2025.05.09/08Ex/main.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+#include <float.h>
+
+#include "init_f.h"
+#include "solve.h"
+
+/* ./a08.out a b eps k */
+int main (int argc, char *argv[])
+{
+	double t, integral, a, b, eps;
+	int k, n, calls, task = 8;
+	
+	double (*f_lst[]) (double) = {f0, f1, f2, f3, f4, f5, f6};
+	int len_f = sizeof(f_lst) / sizeof(f_lst[0]);
+
+	if (
+			!((argc == 5) && 
+			sscanf(argv[1], "%lf", &a) == 1 &&
+			sscanf(argv[2], "%lf", &b) == 1 &&
+			((sscanf(argv[3], "%lf", &eps) == 1) && (eps > 0)) &&
+			((sscanf(argv[4], "%d", &k) == 1) && ((0 <= k) && (k < len_f))))
+	) {
+		fprintf(stderr, "Usage: %s a b eps k\n", argv[0]);
+		return -1;
+	}
+
+
+	t = clock();
+	n = t8_solve(f_lst[k], a, b, eps, &integral);
+	t = (clock() - t) / CLOCKS_PER_SEC;
+	
+	calls = get_call_count();
+
+	if (n < 0) {
+		fprintf (stdout, "%s : Task = %d Method is not applicable Count = %d T = %.2f\n", argv[0], task, calls, t);
+		return -2;
+	} else {
+		fprintf (stdout, "%s : Task = %d Res = %e N = %d Count = %d T = %.2f\n", argv[0], task, integral, n, calls, t);
+		return 0;
+	}
+}
+

2025.05.09/08Ex/solve.c

@@ -0,0 +1,47 @@
+#include "solve.h"
+
+#include <math.h>
+#include <float.h>
+
+#define MAX_ITER 30
+
+int t8_solve (
+		double (*f) (double), 
+		double a, double b,
+		double eps, double *res
+) {
+	int it;
+
+	double n = 1;
+	double h = (b - a);
+	double integ_n = (f(a) + f(b)) * h*0.5;
+
+	for (it = 1; it <= MAX_ITER; ++it)
+	{
+		double x = a + h*0.5;
+		double integ_2n = 0;
+	
+		for (int i = 0; i < n; i++)
+		{
+			integ_2n += f(x);
+			x += h;
+		}
+
+		h *= 0.5;
+		integ_2n = integ_2n * h + integ_n * 0.5;
+
+		if (fabs(integ_2n - integ_n) < eps)
+			break;
+		
+		integ_n = integ_2n;
+		n *= 2;
+	}
+
+	if (it > MAX_ITER) 
+		return -1;
+	
+	*res = integ_n;
+
+	return n;
+}
+

2025.05.09/08Ex/solve.h

@@ -0,0 +1,10 @@
+#ifndef SOLVE_H
+#define SOLVE_H
+
+int t8_solve (
+		double (*f) (double), 
+		double a, double b,
+		double eps, double *res
+);
+
+#endif