Добавил исходники Матвея

2025.04.18/dist/Ulyanov_MT/task06.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include "io_status.h"
+#include "array.h"
+#include "functions.h"
+
+double solve6(double, double);
+
+int main(int argc, char* argv[])
+  {
+  int task = 6;
+  double x, eps;
+  double res;
+  double diff;
+  double t;
+  if (!((argc == 3) && sscanf(argv[1], "%le", &x) == 1 && sscanf(argv[2], "%le", &eps) == 1))
+      {
+      printf("Usage: %s x0 eps\n", argv[0]);
+      return 1;
+      }
+  t = clock();
+  res = solve6(x, eps);
+  t = (clock() - t) / CLOCKS_PER_SEC;
+  diff = fabs(res - cos(x));
+  printf ("%s : Task = %d Result = %e Residual = %e Elapsed = %.2f\n", argv[0], task, res, diff, t);
+  return 0;
+  }
+  
+double solve6(double x, double eps)
+  {
+  int i = 1, sign = 1, flag = 1;
+  double el, res = 0;
+  x = fmod(x, 2 * M_PI);
+  if (x > M_PI)
+      {
+      x = x - M_PI;
+      sign *= -1;
+      }
+  if (x < -M_PI)
+      {
+      x = x + M_PI;
+      sign *= -1;
+      }
+  if (x > M_PI / 2)
+      {
+      x = M_PI - x;
+      sign *= -1;
+      }
+  if (x < -M_PI / 2) 
+      {
+      x = -M_PI - x;
+      sign *= -1;
+      }
+  if (x > M_PI / 4)
+      {
+      x = M_PI / 2 - x;
+      flag = 0;
+      }
+  if (x < -M_PI / 4)
+      {
+      x = -M_PI / 2 - x;
+      sign *= -1;
+      flag = 0;
+      }
+  if (flag == 1)
+      {
+      el = 1;
+      while (fabs(el) >= eps)
+          {
+          res += el;
+          el *= -1 * ((x * x) / (4 * i * i - 2 * i));
+          i++;
+          }
+      }
+  else
+      {
+      el = x;
+      while (fabs(el) >= eps)
+          {
+          res += el;
+          el *= -1 * ((x * x) / (4 * i * i + 2 * i));
+          i++;
+          }
+      }
+  return sign * res;
+  }