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  1.     #include <stdio.h>
  2.     #include <malloc.h>
  3.     int main() {
  4.  
  5.     int arrMatrixMultiplication(int *matrix1, int firstRow, int firstColumn, int *matrix2, int secondRow, int secondColumn, int *resultMatrix);
  6.     void arrFillRandom(int *arrayPtr, int sizeRow, int sizeColumn, int randomRange);
  7.  
  8.     int matrix1[2][3];
  9.     int matrix2[3][2];
  10.  
  11.     int *ptr1, *ptr2;
  12.     ptr1 = &matrix1[0][0];
  13.     ptr2 = &matrix2[0][0];
  14.  
  15.     arrFillRandom(ptr1, 2, 3, 10);
  16.     arrFillRandom(ptr2, 3, 2, 10);
  17.  
  18.     int resultMatrix[2][2];
  19.     int *ptr3;
  20.     ptr3 = &resultMatrix[0][0];
  21.  
  22.     arrMatrixMultiplication(ptr1, 2, 3, ptr2, 3, 2, ptr3);
  23.     printf("\nThe result is: \n");
  24.     printf("%d", ptr3[0]);
  25.  
  26.     return 0;
  27.     }
  28.  
  29.     int arrMatrixMultiplication(int *matrix1, int firstRow, int firstColumn, int *matrix2, int secondRow, int secondColumn, int *resultMatrix) {
  30.     int i, j, k, sum = 0;
  31.  
  32.     	if (firstColumn != secondRow) {
  33.     		return 0;
  34.     	} else {
  35.     		for (i = 0; i < firstRow; i++) {
  36.     			for (j = 0; j < secondColumn; j++) {
  37.     				for (k = 0; k < secondRow; k++) {
  38.     					sum = sum + (matrix1[i * secondColumn + k] * matrix2[k * secondColumn + j]);
  39.     				}
  40.     				resultMatrix[i * secondColumn + j] = sum;
  41.     				sum = 0;
  42.     			}
  43.     		}
  44.     	}
  45.  
  46.     	for (i = 0; i < firstRow; i++) {
  47.     		printf("\n");
  48.     		for (j = 0; j < secondColumn; j++)
  49.     			printf("%d\t", resultMatrix[i * secondColumn + j]);
  50.     	}
  51.     }
  52.  
  53.     void arrFillRandom(int *arrayPtr, int sizeRow, int sizeColumn, int randomRange) {
  54. 	int i, j;
  55.  
  56. 	for (i = 0; i < sizeRow; i++)
  57. 		for (j = 0; j < sizeColumn; j++)
  58. 			(arrayPtr + i)[j] = (rand() % randomRange);
  59.  
  60. 	for (i = 0; i < sizeRow; i++) {
  61. 		printf("\n");
  62. 		for (j = 0; j < sizeColumn; j++)
  63. 			printf("%d\t", (arrayPtr + i)[j]);
  64. 	}
  65. }
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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3	5	3	
5	3	5	
6	9	
9	2	
2	7	
403543789	644927514	
134514615	-1216679886	
The result is: 
403543789
https://ideone.com/NEq4Zl
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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