Question

我是C中的一个初学者，并且一直在尝试编写一个可以拉/推并显示其中元素的Stack程序。我遇到了一些我无法确定其根源的问题。到目前为止，这是我的代码：

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

#define STACK_SIZE 100

char ch;
int contents[STACK_SIZE], top = 0;

void display();

int stack_overflow(void)
{
        printf("Expression is too complex\n");
        exit(EXIT_FAILURE);
}

int stack_underflow(void)
{
        printf("Not enough operands in expression\n");
        exit(EXIT_FAILURE);
}

void make_empty(void)
{
    top = 0;                //makes the element at the top of the stack = 0
}

bool is_empty(void)
{
    return top == 0;        //returns 1 if the top is equal to 0
}

bool is_full(void)
{
    return top == STACK_SIZE;   //returns 1 if the top is the maximun stack size (already full)
}

void push(char i)
{
    if (is_full())
        stack_overflow();
    else
        contents[top++] = i;
}

char pop(void)
{
    if (is_empty())
        stack_underflow();
    else
        return contents[--top];
}


int main(void)
{
    int choice;
    int option = 1;
    int num;



    printf ("STACK OPERATION\n");
    while (option)
    {
        printf ("------------------------------------------\n");
        printf (" 1 --> PUSH \n");
        printf (" 2 --> POP \n");
        printf (" 3 --> DISPLAY \n");
        printf (" 4 --> EXIT \n");
        printf ("------------------------------------------\n");

        printf ("Enter your choice\n");
        scanf ("%d", &choice);

        switch (choice)
        {
            case 1: printf("Enter number you want to push: ");
                    scanf("%d",&num);
                    push(num);
                    break;

            case 2: pop();
                    break;

            case 3: display();
                    break;

            case 4: return;
        }

        fflush (stdin);
        printf ("Do you want to continue(Type 0 or 1)?\n");
        scanf ("%d", &option);
    }
}



void display()
{
    int i;

    printf("\n\n");

    for(i=0;i< top ;i++)
        printf("%d\n",contents[i]);
}


STACK OPERATION
------------------------------------------
 1 --> PUSH
 2 --> POP
 3 --> DISPLAY
 4 --> EXIT
------------------------------------------
Enter your choice
1
Enter number you want to push: 100
Do you want to continue(Type 0 or 1)?
1
------------------------------------------
 1 --> PUSH
 2 --> POP
 3 --> DISPLAY
 4 --> EXIT
------------------------------------------
Enter your choice
1
Enter number you want to push: 500
Do you want to continue(Type 0 or 1)?
1
------------------------------------------
 1 --> PUSH
 2 --> POP
 3 --> DISPLAY
 4 --> EXIT
------------------------------------------
Enter your choice
3


100
-12
Do you want to continue(Type 0 or 1)?
0

进程返回0（0x0）执行时间：11.474秒按任意键继续。

似乎没有正确存储元素或者可能打印错误。也许使用top变量来遍历循环是错误的？任何帮助将不胜感激。

Answer 1

您的推送功能仅获得char：

void push(char i)

char的范围是0到255（unsigned char）或-127到128（signed char = char - 这是默认设置。

你输入的'500'将因此减少（mod 256）到-12 - 这就是你打印的内容。

您需要将参数设为int，它应该有效。

C上的堆栈（简单程序）

1 个答案: