后缀表达式转为树，后缀表达式中含有大于十的数，用c语言写出代码

以下是用C语言实现将后缀表达式转化为表达式树的示例代码：

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

#define MAX_STACK_SIZE 100

typedef struct TreeNode {
    char data;
    struct TreeNode *left;
    struct TreeNode *right;
} TreeNode, *TreeNodePtr;

typedef struct Stack {
    int top;
    TreeNodePtr stackArray[MAX_STACK_SIZE];
} Stack, *StackPtr;

void push(StackPtr stack, TreeNodePtr node) {
    if (stack->top < MAX_STACK_SIZE - 1) {
        stack->stackArray[++stack->top] = node;
    } else {
        printf("Stack overflow\n");
        exit(1);
    }
}

TreeNodePtr pop(StackPtr stack) {
    if (stack->top > -1) {
        return stack->stackArray[stack->top--];
    } else {
        printf("Stack underflow\n");
        exit(1);
    }
}

int isOperator(char c) {
    return (c == '+' || c == '-' || c == '*' || c == '/');
}

TreeNodePtr createNode(char data) {
    TreeNodePtr node = (TreeNodePtr) malloc(sizeof(TreeNode));
    node->data = data;
    node->left = node->right = NULL;
    return node;
}

TreeNodePtr createExpressionTree(char *postfix) {
    Stack stack;
    stack.top = -1;

    int i = 0;
    char c = postfix[i];
    while (c != '\0') {
        if (!isOperator(c) && !isdigit(c)) {
            printf("Invalid character in postfix expression\n");
            exit(1);
        }

        TreeNodePtr node = createNode(c);

        if (isdigit(c)) {
            push(&stack, node);
        } else {
            node->right = pop(&stack);
            node->left = pop(&stack);
            push(&stack, node);
        }

        c = postfix[++i];
    }

    return pop(&stack);
}

void inorderTraversal(TreeNodePtr root) {
    if (root) {
        inorderTraversal(root->left);
        printf("%c ", root->data);
        inorderTraversal(root->right);
    }
}

int main() {
    char postfix[] = "23+45*6/+";
    TreeNodePtr root = createExpressionTree(postfix);

    printf("Inorder traversal of expression tree: ");
    inorderTraversal(root);
    printf("\n");

    return 0;
}

该程序中使用了一个栈来存储表达式树的节点，其中`push`和`pop`函数用于将节点压入栈中和从栈中弹出节点。`isOperator`函数用于检查给定字符是否为运算符。`createNode`函数用于创建新的节点。`createExpressionTree`函数用于从给定的后缀表达式中创建表达式树。最后，`inorderTraversal`函数用于对表达式树进行中序遍历并输出结果。