编辑代码

#include <stddef.h>
#include <stdio.h>
#define DATATYPE char
#define MAXSIZE 100
typedef struct
 {  DATATYPE data[MAXSIZE];
    int top;
} SEQSTACK;
SEQSTACK *s;
void init_stack(SEQSTACK *s)
{
    s->top= -1;
}
int stack_empty (SEQSTACK *s)
{
    if(s->top==-1)
    return 1;
    else
    return 0;
}
void push_stack(SEQSTACK *s,DATATYPE x)
{
    if(s->top==MAXSIZE-1)
    printf("stack full\n");
    else
    {
        s->top++;
        s->data[s->top]=x;
    }
}
DATATYPE gettop_stack(SEQSTACK *s)
{
    DATATYPE x;
    if(stack_empty(s))
    {
        printf("stack empty.\n");
        x=0;
    }
    else
    x=s->data[s->top];
    return x;
}
DATATYPE pop_stack(SEQSTACK *s)
{
    DATATYPE x;
    if(stack_empty (s))
    {
        printf("stack empty\n");
        x=0;
    }
    else
    {
        x=s->data[s->top];
        s->top--;
    }
    return x;
}
void clear_stack(SEQSTACK *s)
{
    s->top =-1;
}
int stacklength(SEQSTACK *s)
{
    return s->top+1;
}
void dec_to_oct(int num, SEQSTACK *s) {
    if (num == 0) {
        push_stack(s, '0'); 
    } else {
        while (num > 0) {
            push_stack(s, (num % 8) + '0');
            num /= 8; 
        }
    }
}

int main() {
    SEQSTACK stack;
    init_stack(&stack); 

    int num;
    printf("请输入一个10进制整数: ");
    if (scanf("%d", &num) != 1) {
        printf("输入无效！\n");
        return 1;
    }
    dec_to_oct(num, &stack);

    printf("转换后的8进制数为: ");
    while (!stack_empty(&stack)) {
        printf("%c", pop_stack(&stack)); 
    }
    printf("\n");

    return 0;
}