initial commit

C++/lesson4/task1.cpp

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+#include <iostream>
+
+void increment(int& num) {
+    num++;
+    std::cout << "Inside function: " << num << "\n";
+}
+
+int main() {
+    int x = 5;
+    increment(x);
+    std::cout << "Outside function: " << x << "\n";
+    return 0;
+}

C++/lesson4/task2.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+
+void foo(int* bar) {
+    (*bar)++;
+}
+
+int main() {
+    int a[3] = {10, 20, 300};
+    foo(a);
+    std::cout << a[0];
+}

C++/lesson4/task3.cpp

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+#include <iostream>
+#include <string>
+
+int main() {
+    std::string s;
+    std::getline(std::cin, s);
+    unsigned count = 1;
+    for (char c : s) {
+        if (c == ' ') {
+            count++;
+        }
+    }
+    std::cout << count << '\n';
+}

C++/lesson4/task4.cpp

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+#include <iostream>
+#include <string>
+
+int main() {
+    const std::string vovels = "aeiouAEIOU";
+    std::string s;
+    std::getline(std::cin, s);
+    unsigned count = 0;
+
+    for (char c : s) {
+        if (vovels.find(c) != std::string::npos) {
+            count++;
+        }
+    }
+
+    std::cout << count << '\n';
+}

C++/lesson4/task5.cpp

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+#include <iostream>
+#include <string>
+
+int main() {
+    std::string s;
+    std::string sf;
+    std::string sr;
+    std::getline(std::cin, s);
+    std::getline(std::cin, sf);
+    std::getline(std::cin, sr);
+}

C++/lesson4/task6.cpp

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+#include <iostream>
+#include <string>
+
+int main() {
+    std::string s;
+    std::string r;
+
+    std::getline(std::cin, s);
+    r.reserve(s.length());
+
+    for (int i = s.length() - 1; i >= 0; i--) {
+        r.push_back(s[i]);
+    }
+
+    std::cout << r << '\n';
+}

C++/lesson4/task7.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+#include <string>
+
+int main() {
+    std::string s;
+    std::string f;
+    std::string r;
+
+    std::getline(std::cin, s);
+    std::getline(std::cin, f);
+    std::getline(std::cin, r);
+
+    size_t pos = s.find(f);
+    while (pos != std::string::npos) {
+        s.replace(pos, f.length(), r);
+        pos = s.find(f);
+    }
+
+    std::cout << s << '\n';
+}