C++/C语言程序代码

 //-----------------------------------1
 #include <stdio.h>
 #include<stdlib.h>
 void main()
 {
     int value = ;

     printf("%01d\n", value);
     printf("%02d\n", value);
     printf("%03d\n", value);
     printf("%04d", value);
     getchar();
     getchar();
     getchar();
     getchar();
 }
 //--------------------------------2

 #include <stdio.h>
 int main(void)
 {
     double a = 50.00, b = 3.00, y = 0.00, m = 0.00, u = 0.00, c = 0.00;
     scanf("%lf", &c);
     y = a + c;
     m = y/b;
     u = a/m;
     printf("%lf\n", u);
     return ;
 }

 graphics代码
 #include "graphics.h"
 #include "conio.h"
 #include "easyx.h"
 ht(int x,int y)
 {
     setcolor(YELLOW);
     setfillcolor(BLUE);
     fillcircle(x,y,);
     Sleep();
     setcolor(BLACK);
     setfillcolor(BLACK);
     fillcircle(x,y,);
 }
 void main()
 {
     initgraph(,);  //(x,y)  只要有一个变量等于定值时开始反弹、x=0、x=460、y=620、y=0
     int flagx=,flagy=;  //用来标记 球走的方向 (0,0)向右下、(1,0)左下、(0,1)右上、(1,1)左上
     int x=,y=;
     while ()
     {

         switch(flagx)
         {
         case :
             {
                 switch(flagy)
                 {
                 case :{

                            x+=;
                            y+=;
                            ht(x,y);
                            if (x=)
                            {
                                flagx=;
                                flagy=;
                            }
                            if (y=)
                            {
                                flagy=;
                                flagx=;
                            }
                        }break;
                 case :{
                             x+=;
                             y-=;
                             ht(x,y);
                             if (x=)
                             {
                                 flagy=;
                                 flagx=;
                             }

                             if (y=)
                             {
                                 flagy=;
                                 flagx=;
                             }
                        }break;
                 }
             }
         case :
             {
                 switch(flagy)
                 {
                  case :{

                            x+=;
                            y-=;
                            ht(x,y);
                            if (y=)
                            {
                                flagx=;
                                flagy=;
                            }
                            if (x=)
                            {
                                flagy=;
                                flagx=;
                            }
                        }break;
                 case :{
                              x-=;
                             y-=;
                             ht(x,y);
                             if (x=)
                             {
                                 flagy=;
                                 flagx=;
                             }

                               if (y=)
                             {
                                 flagy=;
                                 flagx=;
                             }
                        }break;
                 }

             }

         }
     }
     getch();
     closegraph();
 }

 //-----------------------------------1
 #include <stdio.h>
 #include<stdlib.h>
 void main()
 {
     int value = ;

     printf("%01d\n", value);
     printf("%02d\n", value);
     printf("%03d\n", value);
     printf("%04d", value);
     getchar();
     getchar();
     getchar();
     getchar();
 }
 //--------------------------------2
 #include <stdio.h>
 #include <ctype.h>
 #include <conio.h>

 void main()
 {
     char letter;  // Letter typed by the user

     printf("Do you want to continue? (Y/N): ");

     letter = getch();          // Get the letter
     letter = toupper(letter);  // Convert letter to uppercase

     while ((letter != 'Y') && (letter != 'N'))
     {
         putch();                  // Beep the speaker
         letter = getch();          // Get the letter
         letter = toupper(letter);  // Convert letter to uppercase
     }

     printf("\nYour response was %c\n", letter);
     /*putch()向屏幕输出字符的函数
     使用方式：
     ① putch('转义字符')；
     ② putch('单个字符')；
     ③ putch(字符变量)；
     注：③需先定义 char 字符变量＝'单个字符'；
     头文件：conio.h
     -----
     putchar()在stdout上输出字符的宏
     原形：int putchar(int c)
     返回值：成功返回字符c,失败返回EOF。
     头文件：stdio.h,7是响铃的意思*/
 }
 //-------------------------------------------3
 #include <stdio.h>

 void main()
 {
     char letter;

     int vowel_count = ;

     for (letter = 'A'; letter <= 'Z'; letter++)
         switch (letter) {
         case 'A':
         case 'E':
         case 'I':
         case 'O':
         case 'U': vowel_count++;
     };

     printf("The number of vowels is %d\n", vowel_count);
 }
 //------------------------------------------4
 #include <stdio.h>

 void main()
 {
     int counter;

     for (counter = ; counter <= ; counter++)
     {
         if (counter == )
             break;

         printf("%d ", counter);
     }

     printf("\nNext loop\n");

     for (counter = ; counter >= ; counter--)
     {
         if (counter == )
             break;

         printf("%d ", counter);
     }
 }