实机演示

链接：https://pan.baidu.com/s/16y5Osxkc0p_2nkv1_Gap7g
提取码：2m7d

源码&可执行程序

头文件Cal.h

#ifndef __CAL_H__
#define __CAL_H__
//防止一个源文件两次包含同一个头文件
#include <stdio.h>
#include <stdlib.h>
#define Capacity 114514
//用来存放数字的结构体
typedef struct Number
{
    float Data[Capacity];
    int top;
}number;
//用来存放符号的结构体
typedef struct FuHao
{
    char Data[Capacity];
    int top;
}fuhao;
//实例化结构体
number Numbers;
fuhao FuHaos;
//Initialize
void InitialNum(number *ra);
void InitalFuHao(fuhao *op);
//cls
int ClearNumber(number *ra);
int ClearFuHao(fuhao *op);
//Push
int Pushnumber(number *ra,float e);
int Pushfuhao(fuhao *op,char e);
//pop
int Popnumber(number *ra,float *e);
int Popfuhao(fuhao *op,char *e);
//peek
float PeekTopNumber(number *ra);
char PeekTopfuhao(fuhao *op);
//输入符号是否合法
int IsValid(char ch);
//定义符号运算顺序
int Level(char s);
//比较运算顺序
int LevelCompare(char op1,char op2);
//初级计算器
float CalculateI(float a,float b,char c);
//高级计算器
float CalculateII(number *ra,fuhao *op);
#endif

这个文件“Cal.c”我放了主要函数的内容

#include "Cal.h"
//Initialize
void InitialNum(number *ra)
{
    ra->top = -1;
}
void InitalFuHao(fuhao *op)
{
    op->top = -1;
}
//Clear
int ClearNumber(number *ra)
{
    ra->top = -1;
    return 0;

}
int ClearFuHao(fuhao *op)
{
    op->top = -1;
    return 0;
}
//Push
int Pushnumber(number *ra,float e)
{
    if(ra->top == Capacity-1)
        return 0;
    ra->top++;
    ra->Data[ra->top] = e;
    return 1;
}
int Pushfuhao(fuhao *op,char e)
{
    if(op->top == Capacity-1)
        return 0;
    op->top++;
    op->Data[op->top] = e;
    return 1;
}
//pop
int Popnumber(number *ra,float *e)
{
    if(ra->top == -1)
        return 0;
    *e = ra->Data[ra->top];
    ra->top--;
    return 1;
}
int Popfuhao(fuhao *op,char *e)
{
    if(op->top == -1)
        return 0;
    *e = op->Data[op->top];
    op->top--;
    return 1;
}
//peek
float PeekTopNumber(number *ra)
{
    if(ra->top == -1)
        return 0;
    return ra->Data[ra->top];
}
char PeekTopfuhao(fuhao *op)
{
    if(op->top == -1)
        return 'N';
    return op->Data[op->top];
}
//输入符号是否合法
int IsValid(char ch)
{
    if(ch == '(' || ch == ')' || ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '=')
        return 1;
    return 0;
}
//定义符号运算顺序
int Level(char s)
{
    switch(s)
    {
    case '(':
        return 4;
    case '*':
    case '/':
        return 3;
    case '+':
    case '-':
        return 2;
    case ')':
        return 1;
    default:
        return 0;
    }
}
//比较运算顺序
int LevelCompare(char op1,char op2)
{
    if(Level(op1) < Level(op2))
        return 0;
    return 1;
}
//初级计算器
float CalculateI(float a,float b,char c)
{
    switch(c)
    {
    case '+':
        return a+b;
    case '-':
        return a-b;
    case '*':
        return a*b;
    case '/':
        if(b == 0)
            exit(1);
        return a/b;

    }
}
//高级计算器
float CalculateII(number *ra,fuhao *op)
{
    float a,b;
    char ch,s;
    Pushfuhao(op,'=');
    printf("请输入计算式(键入等号后回车以表示输入完成):");
    ch = getchar();
    while(ch != '=' || PeekTopfuhao(op) != '=')
    {
        /*if(!IsValid(ch))
        {
            //float temp;
            //temp = ch - '0';
			int topT = 0;
			
			char xx[64];
			if(topT>=64){
				exit(0);
			}
			xx[topT] = ch;
			topT++;
			for(int i = 63;i>=topT;i--){
				xx[i] = 0;
				
			}
			printf(xx);
			printf(&xx[topT]);
			float tempT;
			tempT = atof(xx);
			
			//printf("%f",&tempT);
			
            ch = getchar();
            while(!IsValid(ch))
            {	//tempT = atof(xx)；
                //
                ch = getchar();
            }
            Pushnumber(ra,tempT);
        }*/
		if(!IsValid(ch))
		{
			//float temp;
			//temp = ch - '0';
			int topT = 0;
			char xx[999];
			
			for(int i = 999;i>=topT;i--)
			{
			xx[i] = 0;
			}
			
			while(!IsValid(ch))
			{	//tempT = atof(xx)；
				//
				xx[topT] = ch;
				topT++;
				ch = getchar();
				if(topT>=999)
				{
				exit(0);
				}
			}
	
	
		float tempT;
		tempT = atof(xx);
		Pushnumber(ra,tempT);
		}
        else
        {
            if(PeekTopfuhao(op) == '(')
            {
                if(ch == ')')
                    Popfuhao(op,&s);
                else
                    Pushfuhao(op,ch);
                ch = getchar();
            }
            else
            {
                if(!LevelCompare(PeekTopfuhao(op),ch))
                {
                    Pushfuhao(op,ch);
                    ch = getchar();
                }
                else
                {
                    Popnumber(ra,&b);
                    Popnumber(ra,&a);
                    Popfuhao(op,&s);
                    Pushnumber(ra,CalculateI(a,b,s));
                }
            }
        }
    }
    printf("结果是:%f\n",PeekTopNumber(ra));
	//number *p = &Numbers;
	//printf(""p->);
    return 0;
}

这个文件是“main.c”文件，程序的入口

#include <stdio.h>
#include <stdlib.h>
#include "Cal.h"
#include "Cal.c"
int main()
{
    InitialNum(&Numbers);
    InitalFuHao(&FuHaos);
    while(114514)
    {
        
        CalculateII(&Numbers,&FuHaos);
        ClearNumber(&Numbers);
        ClearFuHao(&FuHaos);
        
    }
    return 0;
}