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  1.  
  2. #include <stdio.h>
  3. #include <iostream>
  4. #include <time.h>
  5. int** new_mass(const int n) 
  6. {
  7. 	int** mass = new int *[n];
  8. 	if (!mass) 
  9. 	{
  10. 		printf("Error in new.\n");
  11. 		return NULL;
  12. 	}
  13. 	for (int i = 0; i<n; i++) 
  14. 	{
  15. 		mass[i] = new int[n];
  16. 		if (!mass[i])
  17. 		{
  18. 			printf("Error in new.\n");
  19. 			return NULL;
  20. 		}
  21. 	}
  22. 	return mass;
  23. }
  24. int** del_mass(const int n, int** mass) 
  25. {
  26. 	for (int i = 0; i<n; i++)
  27. 		delete[] mass[i];
  28. 	delete[] mass;
  29. 	return NULL;
  30. }
  31. int** read_mass(int *pn) 
  32. {
  33. 	char s[80];
  34. 	printf("Enter filename for read: ");
  35. 	gets_s(s);
  36. 	FILE *f = fopen(s, "r");
  37. 	if (!f) 
  38. 	{
  39. 		printf("Error in open.\n");
  40. 		return NULL;
  41. 	}
  42. 	if (fscanf(f, "%i", pn) != 1) 
  43. 	{
  44. 		printf("Error in read.\n");
  45. 		fclose(f);
  46. 		return NULL;
  47. 	}
  48. 	int** mass = new_mass(*pn);
  49. 	if (!mass)
  50. 	{
  51. 		fclose(f);
  52. 		return NULL;
  53. 	}
  54. 	for (int i = 0; i < *pn; i++)
  55. 	{
  56. 		for (int j = 0; j < *pn; j++) 
  57. 		{
  58. 			if (fscanf(f, "%i", &mass[i][j]) != 1)
  59. 			{
  60. 				printf("Error in read.\n");
  61. 				mass = del_mass(*pn, mass);
  62. 				fclose(f);
  63. 				return NULL;
  64. 			}
  65. 		}
  66. 	}
  67. 	fclose(f);
  68. 	return mass;
  69. }
  70. int vvod(int **mass, int *n, int *t)
  71. {
  72. 	int** mass = new_mass(*n);
  73. 	for (int i = 0; i < *n; i++)
  74. 		for (int j = 0; j < *n; j++)
  75. 		{
  76. 			printf("\nВведите элемент %i: ", i);
  77. 			scanf("%i", &mass[i]);
  78. 			while (mass[i] < n)
  79. 			{
  80. 				printf("Повторите ввод: ");
  81. 				scanf("%i", &mass[i]);
  82. 			}
  83. 			t = mass[i];
  84. 		}
  85. 	return *t;
  86. }
  87. int print_mass(const int n, int** mass)
  88. {
  89. 	for (int i = 0; i < n; i++)
  90. 	{
  91. 		for (int j = 0; j < n; j++)
  92. 		{
  93. 			printf("%7i ", mass[i][j]);
  94. 		}
  95. 		printf("\n");
  96. 	}
  97. 	printf("\n");
  98. 	return 0;
  99. }
  100. int plus_mass(const int n, int** A, int** B)
  101. {
  102. 	int** mass;
  103. 	mass = new_mass(n);
  104. 	if (!mass) { return 1; }
  105. 	for (int i = 0; i < n; i++)
  106. 		for (int j = 0; j < n; j++)
  107. 			mass[i][j] = A[i][j];
  108. 	print_mass(n, mass);
  109. 	mass = del_mass(n, mass);
  110. 	return 0;
  111. }
  112. int mult_mass(const int n, int** A, int** B) 
  113. {
  114. 	int** mass;
  115. 	mass = new_mass(n);
  116. 	if (!mass) { return 1; }
  117. 	for (int i = 0; i < n; i++)
  118. 		for (int j = 0; j < n; j++) 
  119. 		{
  120. 			mass[i][j] = 0;
  121. 			for (int k = 0; k < n; k++)
  122. 			{
  123. 				mass[i][j] += A[i][k] * B[k][j];
  124. 			}
  125. 		}
  126. 	print_mass(n, mass);
  127. 	mass = del_mass(n, mass);
  128. 	return 0;
  129. }
  130.  
  131.  
  132. int main() 
  133. {
  134. 	setlocale(LC_ALL, "Russian");
  135. 	int n;
  136. 	int** A;
  137. 	char ch;
  138. 	char s[81];
  139. 	do {
  140. 		A = read_mass(&n);
  141. 		if (A) 
  142.  
  143. 			print_mass(n, A);
  144. 			mult_mass(n, A, A);
  145. 			A = del_mass(n, A);
  146. 		}
  147.  
  148. 		printf("Repeat (y/n)? ");
  149. 		gets_s(s);
  150. 		ch = s[0];
  151.  
  152.  
  153. 		while ((ch != 'y') && (ch != 'n')) {
  154. 			printf("Press \"y\" for repeat or \"n\" for exit: ");
  155. 			gets_s(s);
  156. 			ch = s[0];
  157. 		}
  158. 	} while (ch == 'y');
  159.  
  160. 	return 0;
  161. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c:3:20: fatal error: iostream: No such file or directory
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/QlfkFj
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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