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  1. #include <stdio.h>
  2.  
  3. int** addMatrix(int a[3][3], int b[3][3]){
  4. 	int i,j;
  5. 	int **result = (int **)malloc(3 * sizeof(int *));
  6. 	int row;
  7.     for (row = 0; row < 3; row++) {
  8.         result[row] = (int *)malloc(3* sizeof(int));
  9.     }
  10.  
  11. 	for(i=0;i<3;i++){
  12. 		for(j=0;j<3;j++){
  13. 			result[i][j]=0;
  14. 			result[i][j]=a[i][j]+b[i][j];
  15. 		}
  16. 	}
  17. 	return result;
  18. }
  19.  
  20. int** mulMatrix(int a[3][3],int b[3][3]){
  21. 	int **result = (int **)malloc(3 * sizeof(int *));
  22. 	int row;
  23.     for (row = 0; row < 3; row++) {
  24.         result[row] = (int *)malloc(3* sizeof(int));
  25.     }
  26.  
  27.     int i,j,k;
  28.     for(i=0;i<3;i++){
  29.     	for(j=0;j<3;j++){
  30.     		result[i][j] = 0;
  31.     	}
  32.     }
  33.  
  34.     for(i=0;i<3;i++){
  35.     	for(j=0;j<3;j++){
  36.     		for(k=0;k<3;k++){
  37.     			result[i][j] += a[i][k] * b[k][j];
  38.     		}
  39.     	}
  40.     }
  41. 	return result;
  42. }
  43.  
  44. int main(void) {
  45. 	//Initialisng the matrices
  46. 	int A[3][3] = {{2,-2,8},{1,3,6},{0,5,4}};
  47. 	int B[3][3] = {{3,7,3},{5,5,6},{1,2,8}};
  48. 	int AplusB[3][3];
  49. 	int **partA = addMatrix(A,B); //returns A+B
  50. 	int i=0,j=0;
  51. 	printf("Answer A. \n");
  52. 	for(i=0;i<3;i++){
  53. 		for(j=0;j<3;j++){
  54. 			AplusB[i][j]=partA[i][j];
  55. 			printf("%d\t",partA[i][j]);
  56. 		}
  57. 		printf("\n");
  58. 	}
  59.  
  60. 	int **partB = mulMatrix(A,B); //returns AB
  61. 	printf("Answer B. \n");
  62. 	for(i=0;i<3;i++){
  63. 		for(j=0;j<3;j++){
  64. 			printf("%d\t",partB[i][j]);
  65. 		}
  66. 		printf("\n");
  67. 	}
  68.  
  69. 	int **partC = mulMatrix(AplusB,A); //return (A+B)A
  70. 	printf("Answer C. \n");
  71. 	for(i=0;i<3;i++){
  72. 		for(j=0;j<3;j++){
  73. 			printf("%d\t",partC[i][j]);
  74. 		}
  75. 		printf("\n");
  76. 	}
  77. 	return 0;
  78. }
  79.  
Success #stdin #stdout 0s 4180KB
comments (?)
stdin
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Standard input is empty
stdout
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Answer A. 
5	5	11	
6	8	12	
1	7	12	
Answer B. 
4	20	58	
24	34	69	
29	33	62	
Answer C. 
15	60	114	
20	72	144	
9	79	98
https://ideone.com/HupHVK
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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