#include<gtk/gtk.h>
#include<stdlib.h>
#include<stdio.h>
#include<malloc.h>
#include<ctype.h>
#include<string.h>

struct cal
{
    char h;
    char hh[30];
    struct cal *next;
};
char * operating(char ch[10])
{
    int i=0,j=0;  
    char temp[20];
    char *t;
    char *s;    
    struct cal *head,*pre,*p;
    head=(struct cal *)malloc(sizeof(struct cal));
    pre=head;
    p=head;
    p->next=NULL; 
    while(ch[i]!='=')
    {
        j=0;
        p->next=(struct cal *)malloc(sizeof(struct cal));
        p=p->next;
        p->next=NULL;
        p->h=ch[i++];
        while(ch[i]!='+'&&ch[i]!='-'&&ch[i]!='*'&&ch[i]!='/'&&ch[i]!='=')
        {
            temp[j++]=ch[i++];
        }
        temp[j]='\0';    
        strcpy(p->hh,temp);
    }
    pre=head;
    p=pre->next;
    if(p==NULL)
        return;
    pre=p;
    p=pre->next;
    while(p)
    {
        if(p->h=='*'||p->h=='/')
        {
            if(p->h=='*')
            {
                gcvt(atof(pre->hh)*atof(p->hh),10,s);
                strcpy(pre->hh,s);
            }
            else
            {
                gcvt(atof(pre->hh)/atof(p->hh),10,s);
                strcpy(pre->hh,s);
            }
            pre->next=p->next;
            free(p);
            p=pre->next;
            continue;
        }
        pre=p;
        p=pre->next;
    }
    pre=head;
    p=pre->next;
    if(p==NULL)
    {
        return;
    }
    pre=p;
    p=pre->next;
    while(p)
    {
        if(p->h=='+')
        {
            gcvt(atof(pre->hh)+atof(p->hh),10,s);
            strcpy(pre->hh,s);
        }
        else
        {
            gcvt(atof(pre->hh)-atof(p->hh),10,s);
            strcpy(pre->hh,s);
        }
        pre->next=p->next;
        free(p);
        p=pre->next;
    }
    printf("%s\n",pre->hh);    /*显示结算结果在终端，*/
    return pre->hh;  /*返回计算结果*/
}
void on_clicked(GtkWidget *button,gpointer date)   /*这是事件函数，处理按钮事件的*/
{ 
    char temp[255];
    char tempp[255]="+";
    char *t="=";
    strcpy(temp,gtk_entry_get_text(GTK_ENTRY(date)));
    strcat(temp,gtk_button_get_label(GTK_BUTTON(button)));
    gtk_entry_set_text(GTK_ENTRY(date),temp);
    if(strcmp(gtk_button_get_label(GTK_BUTTON(button)),t)==0) /*当按下等于按钮时调用子函数，把字符串传过去，进行计算*/
    {
        strcat(tempp,temp);          /*在字符串前面加一个字符‘+’，此处不多加解释，在子函数里面需要用到*/
        strcpy(temp,tempp);
        gtk_entry_set_text(GTK_ENTRY(date),operating(temp));/**返回计算结果，并显示在文本框中*/
    }
}
void main(int a,char *b[]) /*主函数，负责创建计算器界面*/
{
    GtkWidget *window;
    GtkWidget *text;
    GtkWidget * button[16];
    GtkWidget *table;
    GtkWidget *table2;
    int i=0,j=0,z=0;
    char temp[16][2]={{'0',0x00},{'1',0x00},{'2',0x00},{'3',0x00},{'4',0x00},{'5',0x00},{'6',0x00},{'7',0x00},{'8',0x00},{'9',0x00},{'.',0x00},{'=',0x00},{'+',0x00},{'-',0x00},{'*',0x00},{'/',0x00}};

    gtk_init(NULL,NULL);
    window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"祥子之简易计算器");
    table=gtk_table_new(2,1,FALSE);
    table2=gtk_table_new(4,4,FALSE);
    text=gtk_entry_new();
    gtk_container_add(GTK_CONTAINER(window),table);
    gtk_table_attach(GTK_TABLE(table),text,0,1,0,1,(GtkAttachOptions)(GTK_FILL|GTK_EXPAND),(GtkAttachOptions)(0),0,0);
    gtk_table_attach(GTK_TABLE(table),table2,0,1,1,2,(GtkAttachOptions)(GTK_FILL),(GtkAttachOptions)(GTK_FILL|GTK_EXPAND),0,0);
    
    for(;i<16;j++,i++)
    {
        button[i]=gtk_button_new_with_label(temp[i]);
        if(j%4==0)
        {
            j=0;