栈-二进制转换为十进制

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#include <stdio.h>#include <stdlib.h>//malloc和realloc#include <math.h>//平方的计算#define STACK_INIT_SIZE 20//初始化栈的空间#define STACKINCREMENT 10//扩展空间typedef char ElemType;//建立一个栈typedef struct{    ElemType *base;//栈底    ElemType *top;//栈顶    int stackSize;//栈的容量}sqStack;//栈的初始化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;}//入栈void Push(sqStack *s,ElemType e)//栈的名字，入栈的元素{    if(s->top - s->base >= s->stackSize)//判断栈是否满了    {        s->base=(ElemType *)realloc(s->base,(s->stackSize+STACKINCREMENT)*sizeof(ElemType));        if(!s->base)        {            exit(0);        }    }    *(s->top)=e;    s->top++;}//出栈void Pop(sqStack *s,ElemType *e){    if(s->top==s->base)    {        return;    }    *e=*--(s->top);}//求栈的当前容量int StackLen(sqStack s){    return (s.top-s.base);}int main(){    ElemType c;    sqStack s;    int len,i,sum=0;    InitStack(&s);//初始化    printf("请输入二进制数，输入#符号表示结束！\n");    scanf("%c",&c);    if(c>49||c<48)    {        printf("输入有误！\n");    }    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("转化为十进制数是：%d\n",sum);    return 0;}
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