Amatory1107 #38

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Amatory1107 wants to merge 12 commits into master from Amatory1107-patch-4-0

HomeWork3/Igor Vyhovanets Third Hometask 1.cpp

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+    #include <iostream>
+    #include <cstring>
+    int main(int argc, char* argv[]) {
+      std::cout << "This program reverses string that user inputs" << std::endl;
+      if (argc != 2) {
+        std::cout << "Wrong number of parameters" << std::endl;
+        std::cout << "Usage: ./reverse <string>" << std::endl;
+        return 0;
+      }
+      const size_t kMaxLength = 100;
+      const size_t kLength = strlen(argv[1]);
+      if (kLength > kMaxLength) {
+        std::cout << "Error! Input string should be less than " << kMaxLength << " characters" << std::endl;
+        return 0;
+      }
+      char reversed[kMaxLength + 1]{};  // string should contain termination zero (+1 byte)
+      char *pReversed = reversed;
+      // Reverse the string
+      for (auto *begin = argv[1], *end = begin + kLength, *limit = end; begin < limit; ++begin) {
+        *pReversed++ = *--end;
+      }
+      std::cout << "Initial string:  " << argv[1] << std::endl;
+      std::cout << "Reversed string: " << reversed << std::endl;
+      return 0;

HomeWork3/Igor Vyhovanets Third Hometask 6.cpp

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+    #include <iostream>
+    #include <cstring>
+    int main(int argc, char *argv[]) {
+      std::cout << "This program transforms string to lower case" << std::endl;
+      const size_t kMaxLength = 100;
+      char inputString[kMaxLength]{}, outputString[kMaxLength]{};
+      std::cout << "Enter a string (max " << kMaxLength << " symbols): ";
+      std::cin >> inputString;
+      size_t length = strlen(inputString);
+      if (length > kMaxLength) {
+        std::cout << "Error! Too long string. Exiting." << std::endl;
+        return 0;
+      }
+      std::cout << "Input string:  " << inputString << std::endl;
+      const char kDiff = 'A'-'a';
+      for (size_t i = 0; i < length; i++) {
+        outputString[i] = inputString[i];
+        if (inputString[i] >= 'A' && inputString[i] <= 'Z') {
+          outputString[i] -= kDiff;
+        }
+      }
+      std::cout << "Output string: " << outputString << std::endl;
+      return 0;
+    }

HomeWork3/Igor Vyhovanets Third Hometask2.cpp

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+    #include <iostream>
+    void print_array(const unsigned int array[], const size_t size) {
+      std::cout << '[';
+      for (size_t i=0; i<size; i++) {
+        std::cout << array[i];
+        if (i != size-1) {
+          std::cout << ", ";
+        }
+      }
+      std::cout << ']' << std::endl;
+    }
+    void insert_element (unsigned int * const parray, const size_t size, const unsigned int element) {
+      // Iterate all array and find position where larger elements start
+      auto *begin = parray, *end = begin + size - 1;
+      while (*begin < element && *begin != 0 && begin <= end) {
+        ++begin;
+      }
+      // Move all larger elements to the right
+      while (begin < end) {
+        *end = *(end-1);
+        --end;
+      }
+      // Insert new element
+      *begin = element;
+    }
+    int main(int argc, char **argv) {
+      const size_t kArraySize = 20;
+      unsigned int array[kArraySize]{};
+      std::cout << "This program inserts elements in array" << std::endl;
+      for (size_t i = 0; i < kArraySize; i++) {
+        unsigned int element;
+        do {
+          std::cout << "Insert element (" << i << ") of (" << kArraySize << "), greater than 0: ";
+          std::cin >> element;
+        } while (element == 0);
+        insert_element(array, kArraySize, element);
+        print_array(array, kArraySize);
+      }
+      return 0;
+    }

HomeWork3/Igor Vyhovanets Third Hometask3.cpp

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+    #include <iostream>
+    #include <cstdlib>
+    #include <ctime>
+    #include <random>
+    void print_array(const int array[], const size_t size) {
+      std::cout << '[';
+      for (size_t i=0; i<size; i++) {
+        std::cout << array[i];
+        if (i != size-1) {
+          std::cout << ", ";
+        }
+      }
+      std::cout << ']' << std::endl;
+    }
+    void remove_element (int * const parray, const size_t size, const int element) {
+      bool shiftTriggered{};
+      for (auto *begin = parray, *end = begin + size - 1; begin < end; ++begin) {
+        // If we achieved wanted number then remove it and shift rest of the numbers to the left
+        if (*begin == element) {
+          shiftTriggered = true;
+        }
+        if (shiftTriggered) {
+          *begin = *(begin+1);
+          *(begin+1) = 0;
+        }
+      }
+    }
+    bool is_array_empty(int *const parray, const size_t size) {
+      for (auto *begin = parray, *end = begin + size; begin < end; begin++) {
+        if (*begin != 0) {
+          return false;
+        }
+      }
+      return true;
+    }
+    enum {
+      METHOD_1_BY_HAND = 1,
+      METHOD_2_WITH_RAND,
+      METHOD_3_WITH_MT19937
+    };
+    int main(int argc, char **argv) {
+      std::cout << "This program removes elements from array" << std::endl;
+      std::cout << std::endl << "Choose method of array initializing: " << std::endl;
+      std::cout << "  1: By hand" << std::endl << "  2: With rand()" << std::endl << "  3: With mt19937" << std::endl;
+      const size_t kArraySize = 20;
+      int array[kArraySize]{};
+      const int kMaxRandomNumber = 20;
+      int method;
+      do {
+        std::cin >> method;
+      } while (method < METHOD_1_BY_HAND || method > METHOD_3_WITH_MT19937);
+      // Start RNG
+      std::random_device device;
+      std::mt19937 generator(device());
+      std::uniform_int_distribution<int> distribution(0,kMaxRandomNumber);
+      srand(time(0));
+      switch (method) {
+        case METHOD_1_BY_HAND:
+          for (size_t i = 0; i < kArraySize; i++) {
+            std::cout << "array[" << i << "]: ";
+            std::cin >> array[i];
+          }
+          break;
+        case METHOD_2_WITH_RAND:
+          for (size_t i = 0; i < kArraySize; i++) {
+            array[i] = rand() % kMaxRandomNumber;
+          }
+          break;
+        case METHOD_3_WITH_MT19937:
+          for (size_t i = 0; i < kArraySize; ++i) {
+              array[i] = distribution(generator);
+          }
+          break;
+        default:
+          std::cout << "Unknown error, exiting" << std::endl;
+          return 0;
+      }
+      print_array(array, kArraySize);
+      while ( !is_array_empty(array, kArraySize) ) {
+        int number;
+        std::cout << "Enter number to delete: ";
+        std::cin >> number;
+        remove_element(array, kArraySize, number);
+        print_array(array, kArraySize);
+      }
+      return 0;
+    }

HomeWork3/Igor Vyhovanets Third Hometask4.cpp

-Original file line number
+Diff line change
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+    #include <iostream>
+     #include <cstring>
+     int main(int argc, char* argv[]) {
+       std::cout << "This program reverses string that user inputs" << std::endl;
+       if (argc != 2) {
+         std::cout << "Wrong number of parameters" << std::endl;
+         std::cout << "Usage: ./reverse <string>" << std::endl;
+         return 0;
+       }
+       const size_t kMaxLength = 100;
+       const size_t kLength = strlen(argv[1]);
+       if (kLength > kMaxLength) {
+         std::cout << "Error! Input string should be less than " << kMaxLength << " characters" << std::endl;
+         return 0;
+       }
+       char reversed[kMaxLength + 1]{};    // string should contain termination zero (+1 byte)
+       // Reverse the string
+       // Reduce number of iterations by copying 2 chars at a time (from start and end)
+       for (size_t i = 0; i <= kLength / 2; i++) {
+         *(reversed + i) = *(argv[1] + kLength - i - 1);
+         *(reversed + kLength - i - 1) = *(argv[1] + i);
+       }
+       std::cout << "Initial string:  " << argv[1] << std::endl;
+       std::cout << "Reversed string: " << reversed << std::endl;
+       return 0;
+     }

HomeWork3/Igor Vyhovanets Third Hometask5.cpp

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+Diff line change
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+    #include <iostream>
+    int main(int argc, char *argv[]) {
+      std::cout << "This progtam checks char array and outputs digit from it" << std::endl;
+      const size_t kMaxArrayLen = 100;
+      char array[kMaxArrayLen]{};
+      std::cout << "Enter string (max " << kMaxArrayLen << " elements): ";
+      std::cin >> array;
+      std::cout << "Digits in array: ";
+      bool isNumFound = false;
+      char *ptr = array;
+      while (*ptr != '\0') {
+        if (*ptr >= '0' && *ptr <= '9') {
+          if (!isNumFound) {
+            isNumFound = true;
+            std::cout << '[';
+          }
+          std::cout << *ptr << ", ";
+        }
+        ++ptr;
+      }
+      std::cout << ((isNumFound) ? "\b\b]" : "none") << std::endl;
+      return 0;
+    }

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