Python重写C语言程序100例--Part7，python--part7,‘‘‘【程序51】题

Python重写C语言程序100例--Part7，python--part7,‘‘‘【程序51】题

‘‘‘【程序51】题目：学习使用按位与 & 。　　　1.程序分析：0&0=0; 0&1=0; 1&0=0; 1&1=12.程序源代码：‘‘‘if __name__ == ‘__main__‘:    a = 077    b = a & 3    print ‘a & b = %d‘ % b    b &= 7    print ‘a & b = %d‘ % b

‘‘‘题目：学习使用按位或 | 。1.程序分析：0|0=0; 0|1=1; 1|0=1; 1|1=1　　　　　　　　　　　　2.程序源代码： ‘‘‘if __name__ == ‘__main__‘:    a = 077    b = a | 3    print ‘a | b is %d‘ % b    b |= 7    print ‘a | b is %d‘ % b

‘‘‘【程序53】题目：学习使用按位异或 ^ 。　　　1.程序分析：0^0=0; 0^1=1; 1^0=1; 1^1=02.程序源代码：‘‘‘if __name__ == ‘__main__‘:    a = 077    b = a ^ 3    print ‘The a ^ 3 = %d‘ % b    b ^= 7    print ‘The a ^ b = %d‘ % b

‘‘‘【程序54】题目：取一个整数a从右端开始的4～7位。程序分析：可以这样考虑： (1)先使a右移4位。(2)设置一个低4位全为1,其余全为0的数。可用~(~0<<4)(3)将上面二者进行&运算。‘‘‘if __name__ == ‘__main__‘:    a = int(raw_input(‘input a number:\n‘))    b = a >> 4    c = ~(~0 << 4)    d = b & c    print ‘%o\t%o‘ %(a,d)

‘‘‘【程序55】题目：学习使用按位取反~。　　　1.程序分析：~0=1; ~1=0;2.程序源代码：如何查看复数的16进制数‘‘‘if __name__ == ‘__main__‘:    a = 234    b = ~a    print ‘The a\‘s 1 complement is %d‘ % b    a = ~a    print ‘The a\‘s 2 complement is %d‘ % a

‘‘‘【程序56】题目：画图，学用circle画圆形。　　　1.程序分析：2.程序源代码：#include "graphics.h"main(){int driver,mode,i;float j=1,k=1;driver=VGA;mode=VGAHI;initgraph(&driver,&mode,"");setbkcolor(YELLOW);for(i=0;i<=25;i++){setcolor(8);circle(310,250,k);k=k+j;j=j+0.3;}}‘‘‘if __name__ == ‘__main__‘:    from Tkinter import *    canvas = Canvas(width=800, height=600, bg=‘yellow‘)      canvas.pack(expand=YES, fill=BOTH)                    k = 1    j = 1    for i in range(0,26):        canvas.create_oval(310 - k,250 - k,310 + k,250 + k, width=1)        k += j        j += 0.3    mainloop()

‘‘‘【程序57】题目：画图，学用line画直线。1.程序分析：　　　　　　　　　　　2.程序源代码： ‘‘‘if __name__ == ‘__main__‘:    from Tkinter import *    canvas = Canvas(width=300, height=300, bg=‘green‘)       canvas.pack(expand=YES, fill=BOTH)                      x0 = 263    y0 = 263    y1 = 275    x1 = 275    for i in range(19):        canvas.create_line(x0,y0,x0,y1, width=1, fill=‘red‘)        x0 = x0 - 5        y0 = y0 - 5        x1 = x1 + 5        y1 = y1 + 5    x0 = 263    y1 = 275    y0 = 263    for i in range(21):        canvas.create_line(x0,y0,x0,y1,fill = ‘red‘)        x0 += 5        y0 += 5        y1 += 5    mainloop()

‘‘‘【程序58】题目：画图，学用rectangle画方形。　　　1.程序分析：利用for循环控制100-999个数，每个数分解出个位，十位，百位。2.程序源代码：‘‘‘if __name__ == ‘__main__‘:    from Tkinter import *    root = Tk()    root.title(‘Canvas‘)    canvas = Canvas(root,width = 400,height = 400,bg = ‘yellow‘)    x0 = 263    y0 = 263    y1 = 275    x1 = 275    for i in range(19):        canvas.create_rectangle(x0,y0,x1,y1)        x0 -= 5        y0 -= 5        x1 += 5        y1 += 5            canvas.pack()    root.mainloop()

‘‘‘题目：画图，综合例子。1.程序分析：2.程序源代码：‘‘‘if __name__  == ‘__main__‘:    from Tkinter import *    canvas = Canvas(width = 300,height = 300,bg = ‘green‘)    canvas.pack(expand = YES,fill = BOTH)    x0 = 150    y0 = 100    canvas.create_oval(x0 - 10,y0 - 10,x0 + 10,y0 + 10)    canvas.create_oval(x0 - 20,y0 - 20,x0 + 20,y0 + 20)    canvas.create_oval(x0 - 50,y0 - 50,x0 + 50,y0 + 50)    import math    B = 0.809    for i in range(16):        a = 2 * math.pi / 16 * i        x = math.ceil(x0 + 48 * math.cos(a))        y = math.ceil(y0 + 48 * math.sin(a) * B)        canvas.create_line(x0,y0,x,y,fill = ‘red‘)    canvas.create_oval(x0 - 60,y0 - 60,x0 + 60,y0 + 60)        for k in range(501):        for i in range(17):            a = (2 * math.pi / 16) * i + (2 * math.pi / 180) * k            x = math.ceil(x0 + 48 * math.cos(a))            y = math.ceil(y0 + 48 + math.sin(a) * B)            canvas.create_line(x0,y0,x,y,fill = ‘red‘)        for j in range(51):            a = (2 * math.pi / 16) * i + (2* math.pi / 180) * k - 1            x = math.ceil(x0 + 48 * math.cos(a))            y = math.ceil(y0 + 48 * math.sin(a) * B)            canvas.create_line(x0,y0,x,y,fill = ‘red‘)    mainloop()

Python重写C语言程序100例--Part7,布布扣,bubuko.com

Python重写C语言程序100例--Part7