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#include <stdio.h>
#include <stdlib.h>
#define STACK_INIT_SIZE 20
#define STACKINCREMENT 10
typedef char ElemType;
typedef struct
{
ElemType *base;
ElemType *top;
int stackSize;
}sqStack;
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;
}
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++;
}
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()
{
sqStack s;
char c,e;
InitStack(&s);
printf("请输入中缀表达式,以#作为结束标志:");
scanf("%c", &c);
while(c!='#')
{
/*while( c>='0'||c <='9')
{
printf("%c",c);
scanf("%c",&c);
if(c<'0'||c>'9')
{
printf(" ");
}
}*/
if(')'==c)
{
Pop(&s, &e);
while('('!= e)
{
printf("%c", e);
Pop(&s, &e);
}
}
else if( '+' == c || '-' == c)
{
if(!StackLen(s))
{
Push(&s, c);
}
else
{
do
{
Pop(&s, &e);
if('(' == e)
{
Push(&s, e);
}
else
{
printf("%c", e);
}
}
while(StackLen(s) && '(' != e );
Push(&s,c);
}
}
else if('*' == c || '/' == c || ')' == c)
{
Push(&s, c);
}
else if('#' == c)
break;
else
{
printf("\n出错,输入格式错误! \n");
return -1;
}
scanf("%c", &c);
}
while(StackLen(s))
{
Pop(&s, &e);
printf("%c", e);
}
return 0;
}
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