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  1. #include <stdio.h>
  2. #define DIM 100
  3.  
  4. typedef struct {
  5.         int n, m;
  6.         int M[DIM][DIM];
  7. } Matrix;
  8.  
  9. int multiply(Matrix A, Matrix B, Matrix *C) {
  10.  
  11.     if(A.n - B.m) return 0;
  12.  
  13.      for(int i = 0; i < A.n; ++i) {
  14.  
  15.        for(int j = 0; j < B.m; ++j) {
  16.  
  17.            C->M[ i ][ j ] = 0;
  18.        }
  19.      }
  20.  
  21.      C->n = A.n;
  22.      C->m = B.m;
  23.  
  24.      for(int i = 0; i < A.n; ++i) {
  25.  
  26.        for(int j = 0; j < B.m; ++j) {
  27.  
  28.          for(int k = 0; k < A.n; ++k) {
  29.  
  30.            C->M[i][j] += A.M[i][k] * B.M[k][j];
  31.          }
  32.        }
  33.      }
  34.  
  35.      printf("Matrix Multiplication:\n");
  36.      return 1;
  37. }
  38.  
  39. void read(Matrix *mat) {
  40.      int n, m;
  41.      printf("Lines = ");
  42.      scanf("%d", &n);
  43.      mat->n = n;
  44.      printf("Cols = ");
  45.      scanf("%d", &m);
  46.      mat->m = m;
  47.      for(int i = 0; i < n; ++i) {
  48.        for(int j = 0; j < m; ++j) {
  49.          printf("mat[%d][%d]=",i,j);
  50.          scanf("%d", &mat->M[i][j]);
  51.        }
  52.      }
  53.  
  54. }
  55.  
  56. void display(Matrix mat) {
  57.  
  58.      for(int i = 0; i < mat.n; ++i) {
  59.        for(int j = 0; j < mat.m; ++j) {
  60.          printf("%d ",mat.M[i][j]);
  61.        }
  62.        printf("\n");
  63.      }
  64. }
  65.  
  66.  
  67. int main(int argc, char const *argv[]) {
  68.  
  69.   Matrix A, B, C;
  70.   read(&A);
  71.   display(A);
  72.   read(&B);
  73.   display(B);
  74.  
  75.   if( multiply(A,B,&C) == 1)
  76.  
  77.       display(C);
  78.  
  79.   else printf("No Multiplication!");
  80.  
  81.   return 0;
  82. }
Success #stdin #stdout 0.01s 5444KB
comments (?)
stdin 
3
3
1 2 3
1 2 3
1 2 3
3
3
1 2 3
1 2 3
1 2 3
stdout 
Lines = Cols = mat[0][0]=mat[0][1]=mat[0][2]=mat[1][0]=mat[1][1]=mat[1][2]=mat[2][0]=mat[2][1]=mat[2][2]=1 2 3 
1 2 3 
1 2 3 
Lines = Cols = mat[0][0]=mat[0][1]=mat[0][2]=mat[1][0]=mat[1][1]=mat[1][2]=mat[2][0]=mat[2][1]=mat[2][2]=1 2 3 
1 2 3 
1 2 3 
Matrix Multiplication:
6 12 18 
6 12 18 
6 12 18
https://ideone.com/stXEyF
Matrix Multiplication struct
language:
C (gcc 8.3)
created:
1 year ago
visibility:
secret

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