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1sem/adaptation courses/6/18.cpp

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+// ac_6_18.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double inline funk(int i) {
+    return 1./i;
+}
+
+int main() {
+    double eps;
+    cout << "eps=";
+    cin >> eps;
+    int i = 1;
+    double cur = funk(i);
+    double prev = 1e6*1.;
+    while (abs(cur-prev)>=eps) {
+        prev = cur;
+        cur = funk(++i);
+    }
+    cout << "a(i=" << i << ")=" << cur;
+    return 0;
+}

1sem/adaptation courses/6/19.cpp

@@ -0,0 +1,23 @@
+// ac_6_19.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double inline funk(int i) {
+    return 1./i;
+}
+
+int main() {
+    double A;
+    cout << "A=";
+    cin >> A;
+    int i = 1;
+    double cur = funk(i);
+    double prev = 1e6*1.;
+    while (!((prev > A) && (A >= cur))) {
+        prev = cur;
+        cur = funk(++i);
+    }
+    cout << "a(i=" << i << ")=" << cur;
+    return 0;
+}

1sem/adaptation courses/6/20.cpp

@@ -0,0 +1,28 @@
+// ac_6_20.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double inline funk(int i) {
+    double out = 1;
+    for (int k = 1; k <= i; k++) {
+        out *= (1 - 1 / sqrt(k + i));
+    }
+    return out;
+}
+
+int main() {
+    double eps;
+    cout << "eps=";
+    cin >> eps;
+    int i = 0;
+    double aip = funk(++i);
+    double ai = funk(++i);
+    while (abs(ai-aip)>=eps) {
+        aip = ai;
+        ai = funk(++i);
+    }
+    cout << "a(i=" << i << ")=" << ai;
+    return 0;
+}