123 lines
2.5 KiB
C
123 lines
2.5 KiB
C
#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#define STACK_SIZE 200
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struct Stack
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{
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char values[STACK_SIZE];
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int size;
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};
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void push_stack(struct Stack* stack, char value)
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{
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assert(stack->size < STACK_SIZE);
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stack->values[stack->size] = value;
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stack->size += 1;
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}
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char pop_stack(struct Stack* stack)
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{
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assert(stack->size > 0);
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char value = stack->values[stack->size-1];
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stack->size -= 1;
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return value;
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}
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int count_stack(struct Stack* stack)
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{
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return stack->size;
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}
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void print_stack(struct Stack* stack)
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{
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for (int i=0; i<stack->size; i++)
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{
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printf("%c ", stack->values[i]);
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}
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printf("\n");
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}
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char para(char c)
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{
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if(c=='(') return ')';
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if(c=='<') return '>';
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if(c=='{') return '}';
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if(c=='[') return ']';
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if(c==')') return '(';
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if(c=='>') return '<';
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if(c=='}') return '{';
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if(c==']') return '[';
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}
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int main()
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{
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struct Stack mystack;
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mystack.size=0;
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char str[128];
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scanf("%s", str);
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printf("Read: %s", str);
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int i=0;
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char c, cs;
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bool is_ok=true;
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while(str[i]!='\0' && is_ok)
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{
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c=str[i];
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if(c=='<'||c=='('||c=='{'||c=='[')
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{
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push_stack(&mystack, c);
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}
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if(c=='>'||c==']'||c=='}'||c==')')
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{
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if(count_stack(&mystack)>0)
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cs=pop_stack(&mystack);
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else
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{
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printf("\nUnexpected closing bracket %c in %d\n", c,i);
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is_ok=false;
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break;
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}
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if(c=='>' && cs!='<')
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{
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printf("\nCrossed bracket %c in %d, expected %c", c, i, para(cs));
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is_ok=false;
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break;
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}
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if(c==']' && cs!='[')
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{
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printf("\nCrossed bracket %c in %d, expected %c", c, i, para(cs));
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is_ok=false;
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break;
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}
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if(c==')' && cs!='(')
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{
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printf("\nCrossed bracket %c in %d, expected %c", c, i, para(cs));
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is_ok=false;
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break;
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}
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if(c=='}' && cs!='{')
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{
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printf("\nCrossed bracket %c in %d, expected %c", c, i, para(cs));
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is_ok=false;
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break;
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}
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}
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i++;
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}
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if(count_stack(&mystack)>0)
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{
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cs=pop_stack(&mystack);
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printf("\nMissing closing brackets: %c\n", para(cs));
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}
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else if(is_ok)
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printf("\nAll brackets OK\n");
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return 0;
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} |