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偶尔讲两句洋文的nupter码农
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c++段错误问题，请大神们帮差错修改，十分感谢 编译命令: g++ -std=c++14 -Wall -pedantic maintest.cpp -g -o maintest 代码在此 //以下为 Matrix.h #include <iostream> #include <cassert> using std::size_t; class Matrix {/ private: std::size_t row; std::size_t col; double initV; double* p; public: p=new double[row*col];//use linear array storing all matrix elements for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]=initValue;//assign each element respectively } ~Matrix(){//deconstructor delete []p; } Matrix(const Matrix& m0){ row=m0.rows(); col=m0.cols(); initV=m0.initVal(); p=new double[row*col]; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]=initV; } Matrix& operator=(const Matrix& m0){ row=m0.row; col=m0.col; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]=m0(i,j); return *this; } double& operator()(size_t i, size_t j){ return p[i*col+j]; } const double& operator()(size_t i, size_t j) const{ return p[i*col+j]; } bool operator ==(const Matrix& m0) const{ if(row!=m0.row) return false; if(col!=m0.col) return false; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) if(p[i*col+j]!=m0(i,j)) return false; return true; } bool operator !=(const Matrix& m0) const{ if(row!=m0.row) return true; if(col!=m0.col) return true; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) if(p[i*col+j]!=m0(i,j)) return true; return false; } Matrix& operator +=(const Matrix& m0){ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]+=m0(i,j); return *this; } Matrix operator +(const Matrix& m0) const{ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); Matrix m(this->row,this->col,0); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) m(i,j)=p[i*col+j]+m0(i,j); return m; } Matrix& operator -=(const Matrix& m0){ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]-=m0(i,j); return *this; } Matrix operator -(const Matrix& m0) const{ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); Matrix m(row,col,0); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) m(i,j)=p[i*col+j]-m0(i,j); return m; } Matrix& operator *=(const Matrix& m0){ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); assert("matching size check"&&(col==m0.rows())); for(size_t j=0;j<m0.cols();j++) for(size_t i=0;i<row;i++){ double sum=0; for(size_t k=0;k<col;k++) sum+=p[i*col+k]*m0(k,j); p[i*col+j]=sum; } return *this; } Matrix operator *(const Matrix& m0) const{ assert("matching size check"&&(col==m0.rows())); Matrix m(row,m0.cols(),0); for(size_t j=0;j<m0.col;j++) for(size_t i=0;i<row;i++) for(size_t k=0;k<col;k++) m(i,j)+=p[i*col+k]*m0(k,j); return m; } //get rows of rows std::size_t rows() const{ return row; } std::size_t cols() const{ return col; } double initVal() const{ return initV; } friend std::ostream& operator <<(std::ostream&, const Matrix&); friend std::istream& operator >>(std::istream&, Matrix&); }; //overload input operator>> using std::istream std::istream& operator >>(std::istream& in, Matrix& m0){ std::cout<<"please input elements"<<std::endl; for(size_t i=0;i<m0.row;i++) for(size_t j=0;j<m0.col;j++) in>>m0(i,j); return in; } //overload output operator<< using std::ostream std::ostream& operator <<(std::ostream& out,const Matrix& m0){ for(size_t i=0;i<m0.row;i++){ for(size_t j=0;j<m0.col;j++) out<<m0(i,j)<<""; out<<std::endl; } return out; } //以下为 main.cpp #include <iostream> #include <cassert> #include <cmath> #include "Matrix.h" //to test if two double variables are almost equal bool almostEqual(double a, double b, double epsilon = 1e-13) { return std::abs(a - b) <= epsilon; } // this function allows only matrices of equal dimensions bool almostEqual(const Matrix& a, const Matrix& b, double epsilon = 1e-13){ assert(a.rows() == b.rows());//check if same size assert(a.cols() == b.cols());//check if same size for (size_t i = 0; i < a.rows(); ++i) for (size_t j = 0; j < a.cols(); ++j) if (!almostEqual(a(i, j), b(i, j), epsilon)) return false; return true; } int main() { size_t rows=2;//rows given size_t cols=4;//cols given double initValue=1.0;//initial Value given Matrix m1(rows, cols, initValue);//create source Matrix Matrix m2(1, 1, 0);//create dest. Matrix m2 = std::move(Matrix(m1));//the fault exists here,why? assert("testing assignment/move assignment" && almostEqual(m1, m2, 0.0)); return 0; }
段错误问题，请大神们帮差错修改，十分感谢 编译命令: g++ -std=c++14 -Wall -pedantic maintest.cpp -g -o maintest 代码在此 //以下为 Matrix.h #include <iostream> #include <cassert> using std::size_t; class Matrix {/ private: std::size_t row; std::size_t col; double initV; double* p; public: p=new double[row*col];//use linear array storing all matrix elements for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]=initValue;//assign each element respectively } ~Matrix(){//deconstructor delete []p; } Matrix(const Matrix& m0){ row=m0.rows(); col=m0.cols(); initV=m0.initVal(); p=new double[row*col]; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]=initV; } Matrix& operator=(const Matrix& m0){ row=m0.row; col=m0.col; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]=m0(i,j); return *this; } double& operator()(size_t i, size_t j){ return p[i*col+j]; } const double& operator()(size_t i, size_t j) const{ return p[i*col+j]; } bool operator ==(const Matrix& m0) const{ if(row!=m0.row) return false; if(col!=m0.col) return false; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) if(p[i*col+j]!=m0(i,j)) return false; return true; } bool operator !=(const Matrix& m0) const{ if(row!=m0.row) return true; if(col!=m0.col) return true; for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) if(p[i*col+j]!=m0(i,j)) return true; return false; } Matrix& operator +=(const Matrix& m0){ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]+=m0(i,j); return *this; } Matrix operator +(const Matrix& m0) const{ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); Matrix m(this->row,this->col,0); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) m(i,j)=p[i*col+j]+m0(i,j); return m; } Matrix& operator -=(const Matrix& m0){ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) p[i*col+j]-=m0(i,j); return *this; } Matrix operator -(const Matrix& m0) const{ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); Matrix m(row,col,0); for(size_t i=0;i<row;i++) for(size_t j=0;j<col;j++) m(i,j)=p[i*col+j]-m0(i,j); return m; } Matrix& operator *=(const Matrix& m0){ assert("matching size check"&&(row==m0.rows())); assert("matching size check"&&(col==m0.cols())); assert("matching size check"&&(col==m0.rows())); for(size_t j=0;j<m0.cols();j++) for(size_t i=0;i<row;i++){ double sum=0; for(size_t k=0;k<col;k++) sum+=p[i*col+k]*m0(k,j); p[i*col+j]=sum; } return *this; } Matrix operator *(const Matrix& m0) const{ assert("matching size check"&&(col==m0.rows())); Matrix m(row,m0.cols(),0); for(size_t j=0;j<m0.col;j++) for(size_t i=0;i<row;i++) for(size_t k=0;k<col;k++) m(i,j)+=p[i*col+k]*m0(k,j); return m; } //get rows of rows std::size_t rows() const{ return row; } std::size_t cols() const{ return col; } double initVal() const{ return initV; } friend std::ostream& operator <<(std::ostream&, const Matrix&); friend std::istream& operator >>(std::istream&, Matrix&); }; //overload input operator>> using std::istream std::istream& operator >>(std::istream& in, Matrix& m0){ std::cout<<"please input elements"<<std::endl; for(size_t i=0;i<m0.row;i++) for(size_t j=0;j<m0.col;j++) in>>m0(i,j); return in; } //overload output operator<< using std::ostream std::ostream& operator <<(std::ostream& out,const Matrix& m0){ for(size_t i=0;i<m0.row;i++){ for(size_t j=0;j<m0.col;j++) out<<m0(i,j)<<""; out<<std::endl; } return out; } //以下为 main.cpp #include <iostream> #include <cassert> #include <cmath> #include "Matrix.h" //to test if two double variables are almost equal bool almostEqual(double a, double b, double epsilon = 1e-13) { return std::abs(a - b) <= epsilon; } // this function allows only matrices of equal dimensions bool almostEqual(const Matrix& a, const Matrix& b, double epsilon = 1e-13){ assert(a.rows() == b.rows());//check if same size assert(a.cols() == b.cols());//check if same size for (size_t i = 0; i < a.rows(); ++i) for (size_t j = 0; j < a.cols(); ++j) if (!almostEqual(a(i, j), b(i, j), epsilon)) return false; return true; } int main() { size_t rows=2;//rows given size_t cols=4;//cols given double initValue=1.0;//initial Value given Matrix m1(rows, cols, initValue);//create source Matrix Matrix m2(1, 1, 0);//create dest. Matrix m2 = std::move(Matrix(m1));//the fault exists here,why? assert("testing assignment/move assignment" && almostEqual(m1, m2, 0.0)); return 0; } }
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