1 files changed, 68 insertions, 0 deletions
diff --git a/6_2.c b/6_2.c
new file mode 100644
index 0000000..77b0a9d
--- /dev/null
+++ b/6_2.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define SIZEOFBUF 1024
+
+// какую функцию будем дифференцировать
+double (*const func)(double) = sin;
+
+// пункт 1
+void generate_file1(FILE *f, double min, double max, double dx) {
+	for (double i = min; i < max; i += dx) {
+		fprintf(f, "x = %lf\tf(x) = %lf\t f'(x) = %lf\n",
+				i, func(i), (func(i+dx) - func(i)) / dx
+		       );
+	}
+}
+
+void generate_file2(FILE *in, FILE *out) {
+	char *buf = malloc(SIZEOFBUF);
+	size_t bufsize = SIZEOFBUF;
+	const char *delim = "xf()'= \t\n";
+	while (!feof(in)) {
+		getline(&buf, &bufsize, in);
+		char * p = strtok(buf, delim);
+		do fprintf(out, "%s\t", p);
+		while ((p = strtok(NULL, delim)) != NULL);
+		fputc('\n', out);
+	}
+}
+
+int main(int argc, char *argv[]) {
+	// стандартный цикл обработки аргументов argv
+	if (argc != 5*2 + 1) {
+		fprintf(stderr, 
+			"usage: \n" "%s -1 FILE1 -2 FILE2 -a MIN -b MAX -x DX\n"
+			"\t FILE1: пункт 1, FILE2: пункт2\n"
+			"\tMIN: нижняя граница дифференцирования, MAX: верхняя\n"
+			"\tDX: шаг дифференцирования\n", 
+			*argv);
+		return 1;
+	}
+	const char *f1, *f2;
+	double min, max, dx;
+	for (int i = 0; i < argc; ++i) {
+		if (!strcmp(argv[i], "-1"))
+			f1 = argv[++i];
+		if (!strcmp(argv[i], "-2")) 
+			f2 = argv[++i];
+		if (!strcmp(argv[i], "-a"))
+			min = atof(argv[++i]);
+		if (!strcmp(argv[i], "-b"))
+			max = atof(argv[++i]);
+		if (!strcmp(argv[i], "-x"))
+			dx = atof(argv[++i]);
+	}
+
+	FILE *f1f = fopen(f1, "w+");
+	if (!f1f) return 1;
+	generate_file1(f1f, min, max, dx);
+	fclose(f1f);
+	f1f = fopen(f1, "r");
+	FILE *f2f = fopen(f2, "w+");
+	if (!f2f) return 1;
+	generate_file2(f1f, f2f);
+	return 0;
+}