/usr/bin/ld:/tmp/ccdeQtip.o:在函数“main”中

Question

以下是源代码

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

#define STACK_INIT_SIZE 20
#define STACKINCREMENT 10

typedef char ElemType;
typedef struct
{
    ElemType *base;
    ElemType *top;
    int stackSize;
}sqStack;

void InitStack(sqStack *s)
{
    s->base=(ElemType *)malloc(STACK_INIT_SIZE * sizeof(ElemType));
    if(!s->base)
    {
        exit(0);
    }
    s->top=s->base;
    s->stackSize=STACK_INIT_SIZE;
}

void Push(sqStack *s,ElemType e)
{
    if(s->top-s->base>=s->stackSize)
    {
        s->base=(ElemType *)realloc(s->base,(s->stackSize+STACKINCREMENT)* sizeof(ElemType));
        if(!s->base)
        {
            exit(0);
        }
    }
    *(s->top)=e;
    s->top++;
}

void Pop(sqStack *s, ElemType *e)
{
    if(s->top==s->base)
    {
        return;
    }
    *e=*--(s->top);
}

int StackLen(sqStack s)
{
    return (s.top-s.base);
}

int main()
{
    ElemType c;
    sqStack s;
    int len,i,sum=0;

    InitStack(&s);

    printf("请输入二进制数，输入#符号表示结束！\n");
    scanf("%c",&c);
    while(c!='#')
    {
        Push(&s,c);
        scanf("%c",&c);
    }

    getchar();    //把'\n'从缓冲区去掉

    len=StackLen(s);
    printf("栈的当前容量是：%d\n",len);

    for(i=0;i<len;i++)
    {
        Pop(&s,&c);
        sum=sum+(c-48)*pow(2,i);
    }

    printf("转换为十进制数是：%d\n",sum);


    return 0;
}

编译后出现这个问题，咋回事？