[cpp] Add -Wall compiler option to root CMakeLists

+ Resolve all warnings

cpp/CMakeLists.txt

@@ -18,6 +18,7 @@ project(
 )
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+add_compile_options("-Wall")
 
 add_subdirectory(algorithms)
 add_subdirectory(cmake-example)

cpp/algorithms/sorting/bubble/lib-bubble.cpp

@@ -15,9 +15,9 @@
 void BubbleSort(std::vector<int> &array)
 {
   // For each value within the set, starting at 0
-  for (int sortedPivot = 0; sortedPivot < array.size(); sortedPivot++) {
+  for (size_t sortedPivot = 0; sortedPivot < array.size(); sortedPivot++) {
     // Check every other remaining value in the set
-    for (int j = array.size() - 1; j > sortedPivot; j--) {
+    for (size_t j = array.size() - 1; j > sortedPivot; j--) {
       // Swap if the value at j is less than the value before it
       if (array[j] < array[j - 1]) {
         std::swap(array[j], array[j - 1]);

cpp/algorithms/sorting/count/lib-counting.cpp

@@ -33,7 +33,7 @@ void CountingSort(std::vector<int> &array)
 
   // Count the values less than or equal to each element of tempArray
   // + Since each element stores its own count, just add the count at index i-1
-  for (size_t i = 1; i <= maxValue; i++) {
+  for (int32_t i = 1; i <= maxValue; i++) {
     tempArray[i] += tempArray[i - 1];
     // tempArray[i] - 1 now represents the sorted 0-index pos for each value i
   }

cpp/algorithms/sorting/heap/lib-heap.cpp

@@ -17,7 +17,7 @@ size_t Parent(const size_t &index) { return index / 2;}
 size_t Left(const size_t &index) { return 2 * index + 1;}
 size_t Right(const size_t &index) { return (2 * index) + 2;}
 
-void MaxHeapify(std::vector<int> &array, size_t thisIndex, const int &heapSize)
+void MaxHeapify(std::vector<int> &array, size_t thisIndex, const size_t &heapSize)
 {
   // Get an index for the left and right nodes attached to thisIndex
   size_t l = Left(thisIndex);

cpp/algorithms/sorting/heap/lib-heap.hpp

@@ -18,7 +18,7 @@ size_t Parent(const size_t &index);
 size_t Left(const size_t &index);
 size_t Right(const size_t &index);
 
-void MaxHeapify(std::vector<int> &array, size_t thisIndex, const int &heapSize);
+void MaxHeapify(std::vector<int> &array, size_t thisIndex, const size_t &heapSize);
 
 void BuildMaxHeap(std::vector<int> &array);
 

cpp/algorithms/sorting/insertion/lib-insertion.cpp

@@ -15,7 +15,7 @@ void InsertionSort(std::vector<int> &array)
 {
   // For each value, move left until we find sortedPosition for keyValue
   // + Starting with keyValue at array[1], to check sortedPosition at array[0]
-  for (int keyIndex = 1; keyIndex <= array.size(); keyIndex++) {
+  for (size_t keyIndex = 1; keyIndex <= array.size(); keyIndex++) {
     // Save the current key value
     // + We will look for the sorted position of this value
     const int keyValue = array[keyIndex];

cpp/algorithms/sorting/quick/lib-quick.cpp

@@ -50,7 +50,7 @@ size_t Partition(std::vector<int> &array, size_t begin, size_t end)
   // + Return this value when done, so we know where the lhs partition ends
   ssize_t lhsIndex = begin - 1;
   // For each value within this partition, check for values < keyValue
-  for (int j = begin; j <= end - 1; j++) {
+  for (size_t j = begin; j <= end - 1; j++) {
     if (array[j] <= keyValue) {
       // Swap all values < keyValue into the lhs portion of array
       std::swap(array[++lhsIndex], array[j]);

cpp/algorithms/sorting/radix/lib-counting.cpp

@@ -41,7 +41,7 @@ void CountingSort(std::vector<int> &array, int placeValue)
 
   // Count the values less than or equal to each element of tempArray
   // + Since each element stores its own count, just add the count at index i-1
-  for (int i = 1; i < tempArray.size(); i++) {
+  for (size_t i = 1; i < tempArray.size(); i++) {
     tempArray[i] = tempArray[i] + tempArray[i - 1];
   }
 

cpp/algorithms/sorting/selection/lib-select.cpp

@@ -12,10 +12,10 @@
 #include <vector>
 
 void SelectionSort(std::vector<int> &arr) {
-  for (int leftIndex = 0; leftIndex < arr.size(); leftIndex++) {
+  for (size_t leftIndex = 0; leftIndex < arr.size(); leftIndex++) {
     // Get the index for the minimum number in the unsorted set
-    int min = leftIndex;
+    size_t min = leftIndex;
-    for (int i = leftIndex; i < arr.size(); i++) {
+    for (size_t i = leftIndex; i < arr.size(); i++) {
       // Check if value at i is smaller than value at min index
       min = (arr[min] > arr[i]) ? i : min; // Update min value to i if true
     }

cpp/cryptography/columnar-transposition/lib-cipher.cpp

@@ -21,9 +21,9 @@ void Columnar::InitOrder(std::string temp)
   temp.erase(it, temp.end());
 
   // Step through each character in lexicographic order
-  for (int i = 0; i < temp.size(); i++) {
+  for (size_t i = 0; i < temp.size(); i++) {
     // Check each character in the keyWord for the current lexicographic char
-    for (int j = 0; j < keyWord_.size(); j++) {
+    for (size_t j = 0; j < keyWord_.size(); j++) {
       // If they are equal, push the index of the char in keyWord to orderVect
       if (keyWord_[j] == temp[i]) {
         orderVect_.push_back(j);
@@ -109,7 +109,7 @@ std::string Columnar::Decrypt(std::string message)
   rows.resize(orderVect_.size());
   // Track the ending position after each substring is taken
   int lastPos = 0;
-  for (int i = 0; i < orderVect_.size(); i++) {
+  for (size_t i = 0; i < orderVect_.size(); i++) {
     // If we are assigning to any row < fullRows, it should have + 1 character
     if (orderVect_[i] < fullRows) {
       rows[orderVect_[i]] = message.substr(lastPos, rowLength + 1);