谁能帮帮我-栈求表达式的值

Posted 2021-03-26 zhulmz

求表达式的值
下面的代码有问题，带括号的算不了，哪位大佬能帮我修复一下；我崩溃了。。。。

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

typedef struct {
    int num[100];
    int top;
}Stack1;

typedef struct {
    char num[100];
    int top;
}Stack2;

void Init_stack1(Stack1 *s)
{
    s->top=0;
}

void Init_stack2(Stack2 *s)
{
    s->top=0;
}

void Push_stack1(Stack1 *s,int *e)
{
    s->num[s->top]=*e;
    s->top++;
}

void Push_stack2(Stack2 *s,char *e)
{
    s->num[s->top]=*e;
    s->top++;
}

int Pop_stack1(Stack1 *s)
{
    int e;
    e=s->num[--s->top];
    return e;
}

char Pop_stack2(Stack2 *s)
{
    char e;
    e=s->num[--s->top];
    return e;
}

int GetTop_stack1(Stack1 *s)
{
    int e;
    e=s->num[s->top-1];
    return e;
}

char GetTop_stack2(Stack2 *s)
{
    char e;
    e=s->num[s->top-1];
    return e;
}

//判断优先级
char _judge(char *a,char *b)
{
    if(*a=='+'&&(*b=='+'||*b=='*'||*b=='/'||*b=='('))
    {
        return '<';
    }
    else if(*a=='-'&&(*b=='-'||*b=='*'||*b=='/'||*b=='('))
    {
        return '<';
    }
    else if(*a=='*'&&(*b=='*'||*b=='('))
    {
        return '<';
    }
    else if(*a=='/'&&(*b=='/'||*b=='('||*b=='*'))
    {
        return '<';
    }
    else if(*a=='('&&(*b=='+'||*b=='-'||*b=='*'||*b=='/'))
    {
        return '<';
    }
    else if((*a=='('&&*b==')')||(*a=='#'&&*b=='#'))
    {
        return '=';
    }
    else if (*a=='#'&&(*b=='-'||*b=='+'||*b=='/'||*b=='*'))
    {
        return '<';
    }
    else
    {
        return '>';
    }
    
}

//二元运算
int calculate(int *a,int *b,char *c)
{
    int num1=*a,num2=*b;
    if(*c=='+')
    {
        return num1+num2;
    }
    else if(*c=='-')
    {
        return num1-num2;
    }
    else if(*c=='*')
    {
        return num1*num2;
    }
    else if(*c=='/')
    {
        return num1/num2;
    }
    else
        return 0;
}

int main(){
    
    Stack1 s1,*num;
    Stack2 s2,*symbol;
    num=&s1; symbol=&s2;
    Init_stack1(num);
    Init_stack2(symbol);
    
    char str[30];
    printf("请输入表达式
");
    scanf("%s",str);
    int i=1;
    
    Push_stack2(symbol, &str[0]);
    while(str[i]!='')
    {
        if(str[i]>='0'&&str[i]<='9')
        {
            int t=(int)str[i]-48;
            Push_stack1(num, &t);
        }
        else
        {
            char t=GetTop_stack2(symbol);
            int a,b;char t1;int t2,t3;
            switch (_judge(&t, &str[i])) {
                case '<':
                    Push_stack2(symbol, &str[i]);
                    break;
                case '=':
                    Pop_stack2(symbol);
                    break;
                case '>':
                    if(str[i]==')')
                    {
                        t1=Pop_stack2(symbol);
                        a=Pop_stack1(num);
                        b=Pop_stack1(num);
                        t2=calculate(&b, &a, &t1);
                        Push_stack1(num,&t2);
                        t3=Pop_stack2(symbol);
                    }
                    else
                    {
                        t1=Pop_stack2(symbol);
                        a=Pop_stack1(num);
                        b=Pop_stack1(num);
                        t2=calculate(&b, &a, &t1);
                        Push_stack1(num,&t2);
                        i--;
                        
                    }
                    break;
            }
        }
        i++;
    }
   
    printf("%d
",Pop_stack1(num) );
    printf("%c",GetTop_stack2(symbol));
}
/* 运行结果
请输入表达式
#1-5+7+2*3#
9
Program ended with exit code: 0
*/