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Python重写C语言程序100例--Part7

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【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=1
2.程序源代码:
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if __name__ == ‘__main__‘:
    a = 077
    b = a & 3
    print ‘a & b = %d‘ % b
    b &= 7
    print ‘a & b = %d‘ % b

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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: 
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if __name__ == ‘__main__‘:
    a = 077
    b = a | 3
    print ‘a | b is %d‘ % b
    b |= 7
    print ‘a | b is %d‘ % b

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【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=0
2.程序源代码:
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if __name__ == ‘__main__‘:
    a = 077
    b = a ^ 3
    print ‘The a ^ 3 = %d‘ % b
    b ^= 7
    print ‘The a ^ b = %d‘ % b

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【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。
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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)

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【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
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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

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【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;
	}
}

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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()

 

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【程序57】
题目:画图,学用line画直线。
1.程序分析:           
2.程序源代码: 
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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()


 

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【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:
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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()


 

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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()