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  1. // Valentin Rieuf
  2. // This program checks for basic syntax of a source file, namely open
  3. // braces, brackets, parenthesis
  4. #include <stdio.h>
  5. #define ON 1
  6. #define OFF 0
  7. #define ENCAPLEVELS 15
  8.  
  9. /* 1-24 K&R syntax checker */
  10.  
  11. void pop(int index, int array[]); /* unused */
  12. void push(int index, int symbol, int array[]);
  13.  
  14. int main(void){
  15.  
  16. 	int c, stackTop, fail;
  17. 	int stack[ENCAPLEVELS];
  18.  
  19. 	stackTop = -1;
  20. 	fail = OFF;
  21.  
  22. 	while (((c = getchar()) != EOF) && (fail == OFF)){
  23.  
  24. 		if ((c == '}') || (c == ')') || (c == ']')){
  25. 			if (stackTop == -1){
  26. 				fail = ON;
  27. 				break;
  28. 			} else if (c == ')'){
  29. 				if (c == (stack[stackTop] + 1)){
  30. 					stackTop--;
  31. 				} else {
  32. 					fail = ON;
  33. 					break;
  34. 				}
  35. 			} else {
  36. 				if (c == (stack[stackTop] + 2)){
  37. 					stackTop--;
  38. 				} else {
  39. 					fail = ON;
  40. 					break;
  41. 				}
  42. 			}
  43. 		} else if ((c == '{') || (c == '(') || (c == '[')){
  44. 			stackTop++;
  45. 			push(stackTop, c, stack);
  46. 		}
  47. 	}
  48.  
  49. 	printf("\nvalue of stackTop is %d \n", stackTop);
  50. 	if (stackTop > -1){
  51. 		fail = ON;
  52. 	}
  53.  
  54. 	if (fail == ON){
  55. 		printf("The syntax of this program is NOT balanced.\n");
  56. 	} else {
  57. 		printf("The program IS balanced.\n");
  58. 	}
  59.  
  60. 	return 0;
  61. }
  62.  
  63. void pop(int index, int array[]){
  64. 	/* unused */
  65. }
  66. void push(int index, int symbol, int array[]){
  67. 	array[index] = symbol;
  68. }
Success #stdin #stdout 0s 2116KB
comments (?)
stdin 
		printf("The program IS balanced.\n");
	}

	return 0;
}

void pop(int index, int array[]){
	/* unused */
}
void push(int index, int symbol, int array[]){
	array[index] = symbol;
}
stdout 
value of stackTop is -1 
The syntax of this program is NOT balanced.
https://ideone.com/Vicxrm
language:
C (gcc 8.3)
created:
8 years ago
visibility:
secret

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