usaa24/a1/program.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_LENGTH 100

// Function to check if two brackets are matching
int isMatching(char opening, char closing) {
    return (opening == '{' && closing == '}') ||
           (opening == '[' && closing == ']') ||
           (opening == '(' && closing == ')') ||
           (opening == '<' && closing == '>');
}

int main() {
    char input[MAX_LENGTH + 1];
    char stack[MAX_LENGTH];
    int top = -1; // Stack pointer
    int position = -1; // Start position at -1 to adjust to 0-based indexing
    int foundBracket = 0; // Flag to check if any bracket is found

    // Reading the string
    fgets(input, sizeof(input), stdin);
    
    // Remove newline character if present
    input[strcspn(input, "\n")] = 0;

    // Check if string length exceeds MAX_LENGTH
    if (strlen(input) > MAX_LENGTH) {
        printf("Chyba: dĺžka reťazca presahuje 100 znakov.\n");
        return 1;
    }

    // Iterating over each character in the string
    for (int i = 0; i < strlen(input); i++) {
        char current = input[i];
        position++;

        // Check if current character is an opening bracket
        if (current == '{' || current == '[' || current == '(' || current == '<') {
            stack[++top] = current; // Push to stack
            foundBracket = 1; // Found at least one bracket
        } 
        // If current character is a closing bracket
        else if (current == '}' || current == ']' || current == ')' || current == '>') {
            // If stack is empty, it's an error
            if (top == -1) {
                printf("Read: %s\n", input);
                printf("Unexpected closing bracket %c in %d\n", current, position);
                return 0;
            }

            // If brackets do not match, it's an error
            if (!isMatching(stack[top--], current)) {
                printf("Read: %s\n", input);
                printf("Crossed bracket %c in %d, expected %c.\n", current, position, 
                       (current == '}') ? '{' : (current == ']') ? '[' : 
                       (current == ')') ? '(' : '<');
                return 0;
            }
        }
    }

    // If there are unmatched opening brackets left in the stack
    if (top != -1) {
        printf("Read: %s\n", input);
        printf("Unexpected end of input, expected closing bracket for %c.\n", stack[top]);
        return 0;
    }

    // If no brackets are found, output a success message
    if (!foundBracket) {
        printf("Read: %s\n", input);
        printf("All brackets OK\n");
    } else {
        // Expected correct output if all brackets match
        printf("Read: %s\n", input);
        printf("All brackets OK\n");
    }

    return 0;
}