用c语言来写判断算数表达式中开括号和闭括号是否配对

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

#define MAX_SIZE 100

int main() {
    char expression[MAX_SIZE];
    int stack[MAX_SIZE], top = -1;
    int i, len, flag = 1;

    printf("Enter an arithmetic expression: ");
    fgets(expression, MAX_SIZE, stdin);
    len = strlen(expression);
    expression[len - 1] = '\0';  // remove the newline character at the end

    for (i = 0; i < len; i++) {
        if (expression[i] == '(') {
            stack[++top] = i;
        } else if (expression[i] == ')') {
            if (top == -1) {
                flag = 0;  // unpaired closing bracket
                break;
            } else {
                top--;
            }
        }
    }

    if (top != -1) {
        flag = 0;  // unpaired opening bracket
    }

    if (flag) {
        printf("The brackets in the expression are paired.\n");
    } else {
        printf("The brackets in the expression are not paired.\n");
    }

    return 0;
}

注：该代码使用了一个整型数组实现了栈结构，并且只支持单行输入。