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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main()
  5. {
  6.     // declare itertives and matrices 
  7.     int i, j, k, rows0, cols0, rows1, cols1, matrix0[10][10], matrix1[10][10], matrix2[10][10];
  8.     //printf("Number of Rows and columns shouldn't exceed 10\n");
  9.     //printf("Enter number of rows and columns for first Matrix\n");
  10.     //printf("Enter number of rows: ");
  11.     //scanf("%d", &rows0);
  12.     //printf("Enter number of columns: ");
  13.     //scanf("%d", &cols0);
  14.     rows0 = cols0 = 3;
  15.  
  16.     //printf("Enter number of rows and columns for second Matrix\n");
  17.     //printf("Enter number of rows: ");
  18.     //scanf("%d", &rows1);
  19.     //printf("Enter number of columns: ");
  20.     //scanf("%d", &cols1);
  21.     rows1 = cols1 = 3;
  22.  
  23.     if (cols0!=rows1)
  24.     {
  25.         printf("Number of columns in first matrix should be equal to number of rows in second matrix\n");
  26.         return 0;
  27.     }
  28.  
  29.     //printf("Input values into first Matrix\n");
  30.  
  31.     //for(i = 0; i < rows0; i++)
  32.     //{
  33.     //    printf("Input values in row %d with each value separated with space\n", i);
  34.     //    for(j=0; j< cols0; j++)
  35.     //    {
  36.     //        scanf("%d", &matrix0[i][j]);
  37.     //    }
  38.     //}
  39.     memcpy(matrix0[0], (int[]){ 1, 2, -1}, 3*sizeof (int));
  40.     memcpy(matrix0[1], (int[]){ 3, 2,  0}, 3*sizeof (int));
  41.     memcpy(matrix0[2], (int[]){-4, 0,  2}, 3*sizeof (int));
  42.  
  43.     //printf("Input values into second Matrix\n");
  44.  
  45.     //for(i = 0; i < rows1; i++)
  46.     //{
  47.     //    printf("Input values in row %d with each value separated with space\n", i);
  48.     //    for(j=0; j< cols1; j++)
  49.     //    {
  50.     //        scanf("%d", &matrix1[i][j]);
  51.     //    }
  52.     //}
  53.     memcpy(matrix1[0], (int[]){ 3, 4, 2}, 3*sizeof (int));
  54.     memcpy(matrix1[1], (int[]){ 0, 1, 0}, 3*sizeof (int));
  55.     memcpy(matrix1[2], (int[]){-2, 0, 1}, 3*sizeof (int));
  56.  
  57.     // Matrix multiplication
  58.  
  59.     for (i=0; i<rows0; i++)
  60.     {
  61.         for (j=0; j< cols1; j++)
  62.         {
  63.             matrix2[i][j]=0;
  64.             for(k=0;k<cols1;k++)
  65.             {
  66.                 matrix2[i][j]+=(matrix0[i][k]*matrix1[k][j]);
  67.             }
  68.         }
  69.     }
  70.  
  71.     printf("Resultant matrix after matrix multiplication is\n");
  72.     for(i=0; i < rows0; i++)
  73.     {
  74.         for(j=0; j<cols1; j++)
  75.         {
  76.             printf("%d ", matrix2[i][j]);
  77.         }
  78.         printf("\n");
  79.     }
  80. }
Success #stdin #stdout 0s 5384KB
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stdin
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Standard input is empty
stdout
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Resultant matrix after matrix multiplication is
5 6 1 
9 14 6 
-16 -16 -6
https://ideone.com/NS9vo6
matrix multiplication
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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