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中缀表达式转化为后缀表达式,程序编译时没错,当时运行时结果不对,我自己查了好久也是没结果,希望热心鱼油能帮助我一哈
#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;
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)
{
//栈满,追加空间
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 = s->base + s->stackSize;
s->stackSize += STACKINCREMENT;
}
*(s->top) = e; //储存数据
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(void)
{
sqStack s;
char c,e;
InitStack(&s);
printf("请输入中中缀表达式,以#作为结束的标志:\n");
scanf("%c",&c);
while(c != '#')
{
while(c>='0' && c<='9')
{
printf("%c",c);
scanf("%c",&c);
if(c<'0'|| c>'9')
{
printf(" ");
}
}
if(')' == c) //c == '(' 这样写防止bug出现
{
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("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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