computor.c

普通计算器程序

#include<math.h> 
#include<stdio.h> 
#include<stdlib.h> 
#include<string.h> 
#include<conio.h> 
char *mumber(char* p,double *num) 
  { int l=10,j,i=0;double k=1;char s='\0';
     *num=0; 
    for(j=0;;j++) 
    { switch (p[j])
        {case '-':if(j==0){s='l';break;} 
         case'*':case'+':case'/':case'\0':case')':
         k=*num; if(s=='s')*num=sqrt(k); 
                  else if(s=='l')*num=-k; 
          return p+j; 
        case's':s='s';break; 
        case'0':case'1':case'2': 
        case'3':case'4':case'5':
        case'6':case'7':case'8':case'9': 
         i=(p[j]+2)%10;if(l==1)k=k*0.1;
         *num=*num*l+i*k;break; 
        case'.':l=1;break; 
        default:break;
       } 
    }
} 

char *shhua(char butt[],double num[],char fhao[]) 
{ int i=0;char *p=butt; 
  while(1)
{ p=mumber(p,num+i);
   if(*p==')'||*p=='\0')break;
   fhao[i]=*p;i++;p++;
   } 
fhao[i]='\0';return ++p;

} 
double Jisuan(double num[],char fhao[],int b) 
{int i; 
for(i=0;i<b;i++)switch(fhao[i]) 
   { case'*':num[i+1]*=num[i];  num[i]=0; 
            if(i==0||fhao[i-1]=='+')fhao[i]='+';
             else fhao[i]='-';break; 
      case'/':num[i+1]=num[i]/num[i+1]; num[i]=0; 
         if(i==0||fhao[i-1]=='+')fhao[i]='+';
           else fhao[i]='-';break;
     } 
for(i=0;i<b;i++)switch(fhao[i]) 
   { case'+':num[i+1]+=num[i];     break;
     case'-':num[i+1]=num[i]-num[i+1];break;
    } 
return num[i];
} 
int main(void) 
{  int i;char *p,butt[657],qq[655],*pt,fhao[656/2],ch; 
   double numb, num[656/2]; 
   //puts("Press any key to begin! :\n");  
   printf("Please enter any button :\n"); 
   getch(); 
   while(1){ /*clrscr();*/ 
    //printf("Input the math expresstion :\n   ");  
   printf("\nPlease enter the math express :\n   ");
   gets(butt); 
   if (*butt=='\0')puts("  0");  
   while(1){
     p=butt;
     for(i=0;i<strlen(butt);i++)if(butt[i]=='(')p=butt+i+1; 
     pt=shhua(p,num,fhao);
     numb =Jisuan(num,fhao,strlen(fhao)); 
     if(p==butt){
         sprintf(p,"  =%-12.12f\n",numb);puts(p);break;
                  } 
     i=sprintf(qq,"%-12.12f",numb); 
     for(;(i+1)&&qq[i-1]=='0'||qq[i-1]=='.';i--); 
     sprintf(&(qq[i]),"%s",pt); 
     sprintf(p-1,"%s",qq);printf("  =%s\n",butt);} 
   //printf("Press E(e) to exit and anykey  to continue!\n");  
     puts("\n Press E(e) to exit and anykey  to continue!\n"); 
     ch=getch();if(ch=='e'||ch=='E')break;} 
   //puts("\n Press any key to exit!\n"); 
     printf("\n Goodbye to you!\n"); 
     getch();return 0; 
}