1 //-----------------------------------1 2 #include <stdio.h> 3 #include<stdlib.h> 4 void main() 5 { 6 int value = 5; 7 8 printf("%01d ", value); 9 printf("%02d ", value); 10 printf("%03d ", value); 11 printf("%04d", value); 12 getchar(); 13 getchar(); 14 getchar(); 15 getchar(); 16 } 17 //--------------------------------2
1 #include <stdio.h> 2 int main(void) 3 { 4 double a = 50.00, b = 3.00, y = 0.00, m = 0.00, u = 0.00, c = 0.00; 5 scanf("%lf", &c); 6 y = a + c; 7 m = y/b; 8 u = a/m; 9 printf("%lf ", u); 10 return 0; 11 }
1 graphics代码 2 #include "graphics.h" 3 #include "conio.h" 4 #include "easyx.h" 5 ht(int x,int y) 6 { 7 setcolor(YELLOW); 8 setfillcolor(BLUE); 9 fillcircle(x,y,20); 10 Sleep(500); 11 setcolor(BLACK); 12 setfillcolor(BLACK); 13 fillcircle(x,y,20); 14 } 15 void main() 16 { 17 initgraph(640,480); //(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 18 int flagx=0,flagy=0; //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 19 int x=0,y=0; 20 while (1) 21 { 22 23 switch(flagx) 24 { 25 case 0: 26 { 27 switch(flagy) 28 { 29 case 0:{ 30 31 x+=20; 32 y+=20; 33 ht(x,y); 34 if (x=620) 35 { 36 flagx=0; 37 flagy=1; 38 } 39 if (y=460) 40 { 41 flagy=1; 42 flagx=0; 43 } 44 }break; 45 case 1:{ 46 x+=20; 47 y-=20; 48 ht(x,y); 49 if (x=0) 50 { 51 flagy=0; 52 flagx=0; 53 } 54 55 if (y=460) 56 { 57 flagy=1; 58 flagx=1; 59 } 60 }break; 61 } 62 } 63 case 1: 64 { 65 switch(flagy) 66 { 67 case 0:{ 68 69 x+=20; 70 y-=20; 71 ht(x,y); 72 if (y=460) 73 { 74 flagx=1; 75 flagy=1; 76 } 77 if (x=0) 78 { 79 flagy=0; 80 flagx=0; 81 } 82 }break; 83 case 1:{ 84 x-=20; 85 y-=20; 86 ht(x,y); 87 if (x=0) 88 { 89 flagy=1; 90 flagx=0; 91 } 92 93 if (y=0) 94 { 95 flagy=0; 96 flagx=1; 97 } 98 }break; 99 } 100 101 } 102 103 } 104 } 105 getch(); 106 closegraph(); 107 }
1 //-----------------------------------1 2 #include <stdio.h> 3 #include<stdlib.h> 4 void main() 5 { 6 int value = 5; 7 8 printf("%01d ", value); 9 printf("%02d ", value); 10 printf("%03d ", value); 11 printf("%04d", value); 12 getchar(); 13 getchar(); 14 getchar(); 15 getchar(); 16 } 17 //--------------------------------2 18 #include <stdio.h> 19 #include <ctype.h> 20 #include <conio.h> 21 22 void main() 23 { 24 char letter; // Letter typed by the user 25 26 printf("Do you want to continue? (Y/N): "); 27 28 letter = getch(); // Get the letter 29 letter = toupper(letter); // Convert letter to uppercase 30 31 while ((letter != 'Y') && (letter != 'N')) 32 { 33 putch(7); // Beep the speaker 34 letter = getch(); // Get the letter 35 letter = toupper(letter); // Convert letter to uppercase 36 } 37 38 printf(" Your response was %c ", letter); 39 /*putch()向屏幕输出字符的函数 40 使用方式： 41 ① putch('转义字符')； 42 ② putch('单个字符')； 43 ③ putch(字符变量)； 44 注：③需先定义 char 字符变量＝'单个字符'； 45 头文件：conio.h 46 ----- 47 putchar()在stdout上输出字符的宏 48 原形：int putchar(int c) 49 返回值：成功返回字符c,失败返回EOF。 50 头文件：stdio.h,7是响铃的意思*/ 51 } 52 //-------------------------------------------3 53 #include <stdio.h> 54 55 void main() 56 { 57 char letter; 58 59 int vowel_count = 0; 60 61 for (letter = 'A'; letter <= 'Z'; letter++) 62 switch (letter) { 63 case 'A': 64 case 'E': 65 case 'I': 66 case 'O': 67 case 'U': vowel_count++; 68 }; 69 70 printf("The number of vowels is %d ", vowel_count); 71 } 72 //------------------------------------------4 73 #include <stdio.h> 74 75 void main() 76 { 77 int counter; 78 79 for (counter = 1; counter <= 100; counter++) 80 { 81 if (counter == 50) 82 break; 83 84 printf("%d ", counter); 85 } 86 87 printf(" Next loop "); 88 89 for (counter = 100; counter >= 1; counter--) 90 { 91 if (counter == 50) 92 break; 93 94 printf("%d ", counter); 95 } 96 }