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  1. #include<iostream>
  2. #include<stdlib.h>
  3. #include<iomanip>
  4. #include<math.h>
  5.  
  6.  
  7. using namespace std;
  8.  
  9.  
  10. const int N =32;
  11.  
  12.  
  13.  
  14. void initstaticmatrixA( double MatA[][N], int n )  //initialize matrix A
  15. {                                                 // regular indexing with 2 indices
  16.   for(int i=0; i<n*n; i++) 
  17.  
  18.      MatA[i/n][i%n]=i;
  19. }
  20.  
  21. void initstaticmatrixB( double MatB[][N], int n )  //initialize matrix B
  22. {                                       // regular indexing with 2 indices
  23.   for(int i=0; i<n*n; i++) 
  24.  
  25.       MatB[i/n][i%n]=i;
  26. }
  27.  
  28. void showMats(double MatA[][N], double MatB[][N],int n)  //display matrices A & B
  29. {
  30.   int c;
  31.   cout<<"Matrix A:                          Matrix B:"<<endl;
  32.   cout<<"------------                       ------------"<<endl;
  33.   cout<<endl;                         //regular indexing
  34.   for(int r=0; r<n; r++, cout<<endl)
  35.     {
  36.      for( c=0;c<n;c++)
  37.        cout<<setw(4)<<MatA[r][c];
  38.        cout<<"                ";
  39.      for( c=0;c<n;c++)  
  40.        cout<<setw(4)<<MatB[r][c];
  41.     }
  42.  
  43. }
  44.  
  45. void CalculateMatC(double MatA[][N], double MatB[][N], int n)  //calculate the product     C=A*B
  46. {
  47.    int m=n;
  48.    double MatC[N][N];
  49.    int i, j, k; 
  50.    for(i=0; i<n; i++)
  51.      for(j=0; j<n; j++)
  52.        for(MatC[i][j]=k=0; k<n; k++)
  53.          MatC[i][j] += MatA[i][k]*MatB[k][j]; 
  54.    showMatC(MatC, m);     //Where the problem is!!!!
  55. }
  56.  
  57. void showMatC(double MatC[][N], int n)  //show matrix C
  58. {
  59.   int c;
  60.   cout<<"Matrix C:"<<endl;
  61.   cout<<"------------"<<endl;
  62.   cout<<endl;                         //regular indexing
  63.   for(int r=0; r<n; r++, cout<<endl)
  64.  
  65.    for( c=0;c<n;c++)
  66.      cout<<setw(4)<<MatC[r][c];
  67. }
  68.  
  69. int main()
  70. {
  71.   const int n=2;
  72.   double MatA[N][N], MatB[N][N];  //single
  73.   initstaticmatrixA(MatA, n);
  74.   initstaticmatrixB(MatB, n);
  75.   showMats(MatA,MatB, n);
  76.   CalculateMatC( MatA, MatB, n);
  77.   cout<<endl<<endl;
  78.  
  79.   system("pause");
  80.  
  81.   return 0;
  82. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘void CalculateMatC(double (*)[32], double (*)[32], int)’:
prog.cpp:54:20: error: ‘showMatC’ was not declared in this scope
    showMatC(MatC, m);     //Where the problem is!!!!
                    ^
stdout
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Standard output is empty
https://ideone.com/soXyfw
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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