c/c++语言开发共享C语言实现简单计算器

  #include<stdio.h>  #include<windows.h>//gotoxy  #include<conio.h>  #define width 80  #define height 30  void gotoxy(int x, int y);  void greateframe()  {   int i = 0;   for (i = 0 ; i <  width; i += 2)   {    gotoxy(i, 0); printf("■");    gotoxy(i, height); printf("■");   }   for (i = 0; i < height + 1; i++)   {    gotoxy(0 , i); printf("■");    gotoxy(width, i); printf("■");   }  }  void add()  {   float i, j;   printf("*加法运算*n");   scanf_s("%f %f", &i, &j);   printf("%5.2f + %5.2f=%5.2fn", i, j, i+j);   _getch();  }  void sub()  {   float i, j;   printf("*减法运算*n");   scanf_s("%f %f", &i, &j);   printf("%5.2f - %5.2f=%5.2fn", i, j, i -j);   _getch();  }  void mul()  {   float i, j;   printf("*乘法运算*n");   scanf_s("%f %f", &i, &j);   printf("%5.2f * %5.2f=%5.2fn", i, j, i * j);   _getch();  }  void div()  {   float i, j;   printf("*除法运算*n");   scanf_s("%f %f", &i, &j);   printf("%5.2f / %5.2f=%5.2fn", i, j, i / j);   _getch();  }  int main(int argc, char* argv[])  {   int choose;   while (1)   {    greateframe();    gotoxy(width / 3, height / 3 + 2);    printf("1.加法");    gotoxy(width / 3, height / 3 + 4);    printf("2.减法");    gotoxy(width / 3, height / 3 + 6);    printf("3.乘法");    gotoxy(width / 3, height / 3 + 8);    printf("4.除法");    gotoxy(width / 3, height / 3 + 10);    printf("5.退出程序");    gotoxy(width / 3, height / 3);    printf("请选择你要计算的方式:( )bb");    scanf_s("%d", &choose);    switch (choose)    {    case 1:system("cls");      add(); break;    case 2:system("cls");      sub(); break;    case 3:system("cls");      mul(); break;    case 4:system("cls");      div(); break;    case 5:      exit(0);    }    system("cls");   }  }  void gotoxy(int x, int y)  {   coord pos;   pos.x = x;   pos.y = y;   setconsolecursorposition(getstdhandle(std_output_handle),pos);  }