我正试图撰写一个矩阵,我正在使用一种主要方法加以测试。 它根本没有工作。

我不理解的是,大小(所有RowValues的大小按两倍的大小)是零!

I ve been writing some debug prints but it isn t helping... I m really, really new with C++ so ANY and all help / advice will be appreciated.

 1 #include "matrix.h"
 2 #include <iostream>
 3 #include <sstream>
 4 
 5 Matrix::Matrix(){
 6 };
 7 
 8 Matrix::Matrix(int rows, int columns, double allRowValues [] ){
 9     this->rows = rows;
10     this->columns = columns;
11     this->matrixValues = new double[rows*columns];
13     std::cout <<"ALL ROW VALUES" <<std::endl;
14     std::cout<<"*****" <<std::endl;
15     std::cout << sizeof (allRowValues) << std::endl;
16     std::cout<<"*****" <<std::endl;
17     std::cout << sizeof(allRowValues[0]) << std::endl;
18     std::cout<<"*****" <<std::endl;
19     int size = sizeof(allRowValues)/sizeof(double);
20     int numberOfValues = rows * columns;
21     int currentIndex = 0;
22     for (int i = 0; i < numberOfValues; i++){
23             std::cout<< "MATRIX CONSTRUCTOR
";
24             std::cout<<allRowValues <<std::endl;
25             std::cout<<"-----"<<std::endl;
26             std::cout<<index << std::endl;
27             std::cout<<"-----"<<std::endl;
28             std::cout<<size << std::endl;
29             std::cout<<"-----"<<std::endl;
30             if ((allRowValues) && (currentIndex < size)){
31                 std::cout << "ARV " <<std::endl;
32                 std::cout << allRowValues[currentIndex] << std::endl;
33                 this->matrixValues[i]= allRowValues[currentIndex];
34                 std::cout << "MAT " << allRowValues[currentIndex++] << std::endl;
35             }else{
36                 std::cout << "Else
";
37             }
38         }
39         int index=0;
40         for (int j = 0; j < rows; j++){
41             for (int i = 0; i < columns; i++){
42                 std::cout << this->matrixValues[index++];
43             }
44             std::cout<<std::endl;
45         }
46     };
47 
48     Matrix::Matrix(double* rowValues){
49         int sizeRows = sizeof(rowValues)/sizeof(double);
50         //TODO: throw error for all rows must be the same length
51         this->rows = sizeRows;
52         int sizeColumns = sizeof(rowValues[0])/sizeof(double);
53         this->columns = sizeColumns;
54         this->matrixValues = rowValues;
55     };
56 
57     double Matrix::width(){
58         std::cout << "Width
";
59         return this->columns;
60     };
61 
62     double Matrix::height(){
63         std::cout << "Height
";
64         return this->rows;
65     };
66 
67     std::string Matrix::toString(){
68         int numberOfValues = 0;
69         std::cout<<matrixValues[numberOfValues];
70         std::string build_output;
71         std::cout<<matrixValues;
72         for (int i = 0; i < rows; i++){
73             build_output = "[";
74             std::cout << "
";
75             for (int j = 0; j < columns; j++){
76                 std::cout << "VALUE: " <<matrixValues[numberOfValues];
77                 build_output = matrixValues[numberOfValues];
78                 numberOfValues++;
79             }
80             build_output = " ]";
81         }
82         return build_output;
83     }
84 
85     int main (){
86         double values[6] = {1, 2, 3, 4, 5, 6};
87         std::cout <<"Values: 
";
88         Matrix a = Matrix(2, 3, values);
89         std::cout << a.width() << std::endl;
90         std::cout << a.height() << std::endl;
91         std::cout << a.toString();
92         return 1;
93 }