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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. FILE * input;
  5. int errorFlag = 0;
  6.  
  7. int isDigit(int c) 
  8. {
  9. 	/*do{
  10. 		c = getc(input);
  11. 		printf("%c", c); 
  12. 	}
  13. 	while (c == ' ' || c == '\t' || c == '\n');
  14. 	ungetc(c, input);*/ 
  15. 	if (c >= '0' && c <= '9')
  16. 		return 1;
  17. 	else
  18. 		return 0;
  19. }
  20.  
  21. int op()
  22. {
  23.   int a;
  24.  
  25.         do
  26. 	a = getc(input);
  27. 	while (a == ' ' || a == '\t' || a == '\n');
  28. 	ungetc(a, input);
  29. 	if (a == '+')
  30. 		return 1;
  31. 	else if (a == '-')
  32. 		return 0; 
  33. }
  34.  
  35. int oper(int a, int b, char c) 
  36. {
  37. 	if (c == '+') 
  38. 		return a + b; 
  39. 	if (c == '-') 
  40. 		return a - b; 
  41. }
  42.  
  43. int main(){
  44. 	FILE *input, *output;
  45.  
  46. 	int num1 = 0;
  47. 	int num2 = 0;
  48. 	char op = '\0';
  49.  
  50. 	int value;
  51.  
  52. 	int varValue[26];
  53. 	char varName;
  54. 	int result;
  55.  
  56. 	char c,d; 
  57. 	int cnt = 0; 
  58. 	int cnt2 = 0; 
  59.  
  60. 	input = fopen("input.txt", "r");
  61. 	output = fopen("output.txt", "w"); 
  62.  
  63.     //No input file error
  64. 	if (input == NULL){
  65. 		printf("Missing input file.\n");
  66. 		return;
  67. 	}
  68.  
  69.  
  70.  
  71.  
  72. 	else { 
  73. 		do { 
  74. 				c = getc(input); 
  75.  
  76. 			//printf("%c\n",c);
  77. 			if (c == ' ' || c == '\t' || c == '\n')
  78.             continue;
  79.  
  80. 			if (isDigit(c)) {
  81. 				cnt2 += 1;
  82. 				if (cnt == 0) {
  83. 					d = c-48;  
  84. 					cnt = 1;
  85. 				}
  86. 				else { 
  87.  
  88. 					// call operator function 
  89. 					d = oper(d, c-48, op);  
  90. 				}  
  91. 			} 
  92. 			else {
  93. 				if (c == ';') { 
  94. 					printf("%d\n", d); 
  95. 					cnt = 0; 
  96. 					cnt2 = 0; 
  97. 				}
  98. 				else {
  99. 					op = c; 
  100. 				}  
  101. 			} 
  102. 		} 
  103. 		while (c != EOF); 
  104. 	} 
  105.  
  106.  
  107. 	if (fscanf(input, "%d", &num2) == EOF)
  108. 		printf("Empty input file. \n");
  109.  
  110.  
  111. 	fclose(input);
  112. 	fclose(output);
  113.  
  114. 	system("pause");
  115. 	return 0;
  116. }
  117.  
Runtime error #stdin #stdout 0s 2380KB
comments (?)
stdin
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Standard input is empty
stdout
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Missing input file.
https://ideone.com/HutuWs
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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