/in/exam3_matrix.cpp:9:1: error: prototype for 'intMatrix::intMatrix()' does not match any in class 'intMatrix'
 intMatrix::intMatrix() {
 ^~~~~~~~~
In file included from /in/exam3_matrix.cpp:4:0:
/in/compile/exam3_matrix.h:27:2: error: candidates are: intMatrix::intMatrix(int, int, int)
  intMatrix(int r = 1 , int c = 1, int initialValue = 1); //TODO: Complete this construstor. 7Pts.
  ^~~~~~~~~
/in/compile/exam3_matrix.h:23:2: error:                 intMatrix::intMatrix(const intMatrix&)
  intMatrix(const intMatrix & that) {
  ^~~~~~~~~
/in/exam3_matrix.cpp: In constructor 'intMatrix::intMatrix(int, int, int)':
/in/exam3_matrix.cpp:19:17: error: ISO C++ forbids variable length array 'arr' [-Werror=vla]
     int arr[size];
                 ^
/in/exam3_matrix.cpp: In member function 'void intMatrix::fillFrom(std::vector<int>&)':
/in/exam3_matrix.cpp:36:21: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if(source.size()!=cols+rows){
        ~~~~~~~~~~~~~^~~~~~~~~~~
/in/exam3_matrix.cpp:39:26: error: ISO C++ forbids variable length array 'arr' [-Werror=vla]
         int arr[rows*cols];
                          ^
cc1plus: all warnings being treated as errors