cout< "--- -----请选择方程解答的方案----------"

cout<<"\n 1. 克拉默(Cramer)法则"

cout<<"\n 2. Gauss列主元消去法"

cout<<"\n 3. Gauss全主元消去法"

cout<<"\n 4. Doolittle分解法"

cout<<"\n 5. 退出"

cout<<"\n 输入你的选择:" -cout < <　" ----------- Please choose the solution of equation solution----------　cout < < "　\ n 1. Cramer (Cramer) rule　cout < <　" \ n 2 the Gauss-column primary elimination"　 cout < <　" \ n 3 the Gauss main element elimination　cout < < "　\ n Doolittle decomposition method　cout < <　" \ n Exit　cout < <　" \ n Enter your choice:"