計程作業四, 我的版本...

[smartboy (小光光)]

* 程式撰寫:
  本程式使用 Turbo C++ 3.0 編譯

* 操作說明
  輸入與題目要求相同, 若輸入錯誤或 error (譬如 1/0)則暫存數歸零,
  畫面雖然畫一個計算機, 但並沒有特殊功能, 只有加上對 0^0, 1/0 的判斷

* 程式說明
  程式中用了四個自己寫的 function, 其中 scan_data(), do_next_op() 如
  題目要求一樣, 分別負責處理輸入及運算. 另外還有 DrawCalculator(), 及
  Error(). 前者於程式開始時顯示畫面, 後者處理使用者輸入不合法的情形.
#include <stdio.h>
#include <math.h>
#include <ctype.h>
#include <conio.h>

void DrawCalculator(void)
{
  clrscr();
  printf(
  "+------------------------------------------------------+\n"
  "|                                                      |\n"
  "|                                                      |\n"
  "+------------------------------------------------------+\n"
  "|                                                      |\n"
  "|   CASIO electronic calculator                        |\n"
  "|                                                      |\n"
  "|   +---+ +---+ +---+ +---+ +-----+                    |\n"
  "|   | 7 | | 8 | | 9 | | + | | Sin |                    |\n"
  "|   +---+ +---+ +---+ +---+ +-----+                    |\n"
  "|   +---+ +---+ +---+ +---+ +-----+                    |\n"
  "|   | 4 | | 5 | | 6 | | - | | Cos |                    |\n"
  "|   +---+ +---+ +---+ +---+ +-----+                    |\n"
  "|   +---+ +---+ +---+ +---+ +-----+                    |\n"
  "|   | 1 | | 2 | | 3 | | * | | Tan |                    |\n"
  "|   +---+ +---+ +---+ +---+ +-----+                    |\n"
  "|   +---------+ +---+ +---+ +-----+ +------+           |\n"
  "|   |    0    | | . | | / | | 1/R | | Quit |           |\n"
  "|   +---------+ +---+ +---+ +-----+ +------+           |\n"
  "|                                                      |\n"
  "+------------------------------------------------------+\n");
}

void scan_data(char *op,double *operand)
{
  gotoxy(3,3);
  printf("                                               ");
  gotoxy(3,3);
  scanf(" %c",op);
  if(*op=='+' || *op=='-' || *op=='*' || *op=='/' || *op=='^')
    scanf("%lf",operand);
}

void Error(double *number)
{
  gotoxy(3,2);
  printf("                                                ");
  gotoxy(3,2);
  printf("Operation Error, press any key to continue . . .");
  getch();
  fflush(stdin);
  *number=0;
}

void do_next_op(char op,double operand,double *number)
{
  switch(toupper(op)) {
    case '+':
      *number+=operand;
      break;
    case '-':
      *number-=operand;
      break;
    case '*':
      *number*=operand;
      break;
    case '/':
      if(operand==0)
        Error(number);
      else
        *number/=operand;
      break;
    case '^':
      if(*number==0.0 && operand==0.0)
        Error(number);
      else
        *number=pow(*number,operand);
      break;
    case 'S':
      *number=sin(*number);
      break;
    case 'C':
      *number=cos(*number);
    case 'R':
      if(*number==0.0)
        Error(number);
      else
        *number=1.0/ *number;
    case 'T':
      *number=tan(*number);
      break;
    case 'Q':
      break;
    default:
      Error(number);
      break;
  }
}

int main(void)
{
  char op;
  double number=0.0,operand;
  DrawCalculator();
  do {
    gotoxy(3,2);
    printf("                                                ");
    gotoxy(3,2);
    printf("%f",number);
    scan_data(&op,&operand);
    do_next_op(op,operand,&number);
  } while(toupper(op)!='Q');
  gotoxy(3,2);
  printf("                                                ");
  gotoxy(3,2);
  printf("Final value: %f",number);
  return 0;
}

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