Question

我尝试了几种方法但我无法通过引用获得函数“Matrixinputs”来接受2d数组。 “Matrixinputs”将把数组的输入更改为用户选择的内容。我是初学者，但我认为这与我试图传递一个动态数组的事实有关，这个数组的参数是由用户定义的，但这只是一个猜测。请帮忙，我的错误就像这些

matrix2.C:15:11: error: invalid operands of types ‘int [(((sizetype)(((ssizetype)a) + -1)) + 1)][(((sizetype)(((ssizetype)b) + -1)) + 1)]’ and ‘int [(((sizetype)(((ssizetype)c) + -1)) + 1)][(((sizetype)(((ssizetype)d) + -1)) + 1)]’ to binary ‘operator*’
  cour<<m1*m2;

或

$ g++ matrix.C -omatrixs -lm
matrix.C: In function ‘int main()’:
matrix.C:16:25: error: expression list treated as compound expression in initializer [-fpermissive]

这是我的代码

#include <iostream>
#include <cmath>
using namespace std;
//Prototypes
double Matrixsettings(int&, int&, int&, int&);
int Matrixinputs(int&, int &);

int main()
{
    int a=2, b=2, c=2, d=2;
    cout<<  Matrixsettings( a,b,c,d);
    cout<< a<<b<<c<<d;
    int m1 [a] [b], m2 [c] [d];
    cout<<m1 [a] [b]<< m2 [c] [d];
    int Matrixinputs(m1 [a] [b],m2 [c] [d]);
return 0;
}

double Matrixsettings( int &a, int &b,  int &c, int &d)
{ 
    cout<< "how many rows in the first matrix: ";
    cin>> a;
    cout<< "how many columns in the first matrix: ";
    cin>> b;
    cout<< "how many rows in the second matrix: ";
    cin>> c;
    cout<< "how many columns in the second matrix: ";
    cin>> d;
    return 0;
}

int Matrixinputs(m1& [a] [b],m2& [c] [d]);
{
//this function will have a loop with cout and cin line defining each input of the matrix like array array
}

Answer 1

void Matrixinputs(int* matrix, int row, int column);
{
//this function will have a loop with cout and cin line defining each input of the matrix like array array

for (int i=0; i<row; i++)
{
    for (int j=0; j<column; j++)
    {
        cin >> matrix[i*row+column];
    }
}
}

在此功能之外，手动将内存分配给矩阵指针。

Answer 2

使用矢量很方便，但是使用new的例子。

#include <iostream>

using namespace std;

template <typename T>
T **make_2d(int r, int c){
    T** array_2d = new T*[r];
    for(int i=0;i<r;++i)
        array_2d[i] = new T[c];
    return array_2d;
}

template <typename T>
void drop_2d(T** matrix, int r){
    for(int i=0;i<r;++i)
        delete[] matrix[i];
    delete[] matrix;
}

typedef int** Matrix;

void MatrixInputs(Matrix &m, int r, int c){
    for(int i = 0;i < r; ++i){
        for(int j = 0; j < c;++j){
            cout << "[" << i << "][" << j << "] >";
            cin >> m[i][j];
        }
    }
}

int main(){
    int a,b;
    cin >> a;
    cin >> b;

    Matrix m = make_2d<int>(a, b);

    MatrixInputs(m, a, b);

    //print
    for(int i=0;i<a;++i){
        cout << "[ " ;
        for(int j=0;j<b;++j){
            cout << m[i][j] << " ";
        }
        cout << "]" << endl;
    }
    drop_2d(m, a);
}

我无法让我的简单程序将2d数组传递给函数

2 个答案: