[Linear algebra] multiplication of Matrices

[Linear algebra] multiplication of Matrices
 

 1   //  Matrix Multiplication  
  2 # Include <iostream>
 3   Using   Namespace STD;
 4   
 5  
 6   Int Main ()
 7 {
8       Int Am,;
 9       Int BM, Bn;
 10       Int A [ 100 ] [ 100 ]; //  Matrix  
  11       Int B [ 100 ] [ 100 ];//  Matrix B  
  12       Int C [ 100 ] [ 100 ] = { 0 }; //  Matrix C result matrix  
  13 Cout < "  Enter the number of rows and columns of matrix.  " ;
14 Cin> am>;
 15 Cout < "  Enter the number of rows and columns of matrix B.  " ;
 16 Cin> BM> Bn;
 17       If (! = BM) //  If the number of columns in matrix A must be different from that in matrix B, multiplication cannot be performed.  
  18 Cout < " The two matrices cannot be used for multiplication!  " ;
 19       Else 
 20 { //  The number of columns in matrix A must be equal to the number of rows in matrix B before multiplication.  
  21 Cout < "  Enter matrix  " <Endl;
 22           For (Int I = 0 ; I <am; I ++)
 23               For ( Int J = 0 ; J <an; j ++)
 24 {
 25 Cin> A [I] [J];
 26 }
 27 Cout < "  Enter matrix B " <Endl;
 28           For ( Int I = 0 ; I <bm; I ++)
 29               For ( Int J = 0 ; J <Bn; j ++)
 30 {
 31 Cin> B [I] [J];
 32 }
 33           //  The following is a matrix multiplication calculation.
  34   //  The number of rows and columns in the result matrix is determined by matrix AB. The result matrix is C am * bn.  
  35           For ( Int I = 0 ; I <am; I ++)
 36               For ( Int J = 0 ; J <Bn; j ++)
 37 {
 38                   For ( Int II = 0 ; II <an; II ++)
 39 {
 40 C [I] [J] + = A [I] [II] * B [II] [J];
 41 }
 42 }
 43 Cout < " The result of matrix A * matrix B is:  " <Endl;
 44           For ( Int I = 0 ; I <am; I ++)
 45 {
 46               For ( Int J = 0 ; J <Bn; j ++)
 47 {
 48 Cout <C [I] [J] < "  " ;
 49 }
 50 Cout <Endl;
 51 }
 52 }
 53 System ( "  Pause  " );
 54       Return  0 ;
 55 }