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经典一百例（c语言版）

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<p align="left"><font color="#FF9933"><b><font size="5">　　　　<font color="#3300CC">经典c程序100例==51--60</font></font></b></font></p>
<p><font color="#990000">【程序51】</font><br>
  题目：学习使用按位与 &amp; 。　　　<br>
  1.程序分析：0&amp;0=0; 0&amp;1=0; 1&amp;0=0; 1&amp;1=1<br>
  2.程序源代码：<br>
  #include &quot;stdio.h&quot;<br>
  main()<br>
  {<br>
  int a,b;<br>
  a=077;<br>
  b=a&amp;3;<br>
  printf(&quot;\40: The a &amp; b(decimal) is %d \n&quot;,b);<br>
  b&amp;=7;<br>
  printf(&quot;\40: The a &amp; b(decimal) is %d \n&quot;,b);<br>
  }<br>
  ==============================================================<br>
  <font color="#990000">【程序52】</font><br>
  题目：学习使用按位或 | 。<br>
  1.程序分析：0|0=0; 0|1=1; 1|0=1; 1|1=1　　　　　　　　　　　　<br>
  2.程序源代码：<br>
  #include &quot;stdio.h&quot;<br>
  main()<br>
  {<br>
  int a,b;<br>
  a=077;<br>
  b=a|3;<br>
  printf(&quot;\40: The a &amp; b(decimal) is %d \n&quot;,b);<br>
  b|=7;<br>
  printf(&quot;\40: The a &amp; b(decimal) is %d \n&quot;,b);<br>
  }<br>
  ==============================================================<br>
  <font color="#990000">【程序53】</font><br>
  题目：学习使用按位异或 ^ 。　　　<br>
  1.程序分析：0^0=0; 0^1=1; 1^0=1; 1^1=0<br>
  2.程序源代码：<br>
  #include &quot;stdio.h&quot;<br>
  main()<br>
  {<br>
  int a,b;<br>
  a=077;<br>
  b=a^3;<br>
  printf(&quot;\40: The a &amp; b(decimal) is %d \n&quot;,b);<br>
  b^=7;<br>
  printf(&quot;\40: The a &amp; b(decimal) is %d \n&quot;,b);<br>
  }<br>
  ==============================================================<br>
  <font color="#990000">【程序54】</font><br>
  题目：取一个整数a从右端开始的4～7位。<br>
  程序分析：可以这样考虑： <br>
  (1)先使a右移4位。<br>
  (2)设置一个低4位全为1,其余全为0的数。可用~(~0&lt;&lt;4)<br>
  (3)将上面二者进行&amp;运算。<br>
  2.程序源代码：<br>
  main()<br>
  {<br>
  unsigned a,b,c,d;<br>
  scanf(&quot;%o&quot;,&amp;a);<br>
  b=a&gt;&gt;4;<br>
  c=~(~0&lt;&lt;4);<br>
  d=b&amp;c;<br>
  printf(&quot;%o\n%o\n&quot;,a,d);<br>
  }<br>
  ==============================================================<br>
  <font color="#990000">【程序55】</font><br>
  题目：学习使用按位取反~。　　　<br>
  1.程序分析：~0=1; ~1=0;<br>
  2.程序源代码：<br>
  #include &quot;stdio.h&quot;<br>
  main()<br>
  {<br>
  int a,b;<br>
  a=234;<br>
  b=~a;<br>
  printf(&quot;\40: The a's 1 complement(decimal) is %d \n&quot;,b);<br>
  a=~a;<br>
  printf(&quot;\40: The a's 1 complement(hexidecimal) is %x \n&quot;,a);<br>
  } <br>
  ==============================================================<br>
  <font color="#990000">【程序56】</font><br>
  题目：画图，学用circle画圆形。　　　<br>
  1.程序分析：<br>
  2.程序源代码：<br>
  /*circle*/<br>
  #include &quot;graphics.h&quot;<br>
  main()<br>
  {int driver,mode,i;<br>
  float j=1,k=1;<br>
  driver=VGA;mode=VGAHI;<br>
  initgraph(&amp;driver,&amp;mode,&quot;&quot;);<br>
  setbkcolor(YELLOW);<br>
  for(i=0;i&lt;=25;i++)<br>
  {<br>
  setcolor(8);<br>
  circle(310,250,k);<br>
  k=k+j;<br>
  j=j+0.3;<br>
  }<br>
  } <br>
  ==============================================================<br>
  <font color="#990000">【程序57】</font><br>
  题目：画图，学用line画直线。<br>
  1.程序分析：　　　　　　　　　　　<br>
  2.程序源代码：<br>
  #include &quot;graphics.h&quot;<br>
  main()<br>
  {int driver,mode,i;<br>
  float x0,y0,y1,x1;<br>
  float j=12,k;<br>
  driver=VGA;mode=VGAHI;<br>
  initgraph(&amp;driver,&amp;mode,&quot;&quot;);<br>
  setbkcolor(GREEN);<br>
  x0=263;y0=263;y1=275;x1=275;<br>
  for(i=0;i&lt;=18;i++)<br>
  {<br>
  setcolor(5);<br>
  line(x0,y0,x0,y1);<br>
  x0=x0-5;<br>
  y0=y0-5;<br>
  x1=x1+5;<br>
  y1=y1+5;<br>
  j=j+10;<br>
  }<br>
  x0=263;y1=275;y0=263;<br>
  for(i=0;i&lt;=20;i++)<br>
  {<br>
  setcolor(5);<br>
  line(x0,y0,x0,y1);<br>
  x0=x0+5;<br>
  y0=y0+5;<br>
  y1=y1-5;<br>
  }<br>
  }<br>
  ==============================================================<br>
  <font color="#990000">【程序58】</font><br>
  题目：画图，学用rectangle画方形。　　　<br>
  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。<br>
  2.程序源代码：<br>
  #include &quot;graphics.h&quot;<br>
  main()<br>
  {int x0,y0,y1,x1,driver,mode,i;<br>
  driver=VGA;mode=VGAHI;<br>
  initgraph(&amp;driver,&amp;mode,&quot;&quot;);<br>
  setbkcolor(YELLOW);<br>
  x0=263;y0=263;y1=275;x1=275;<br>
  for(i=0;i&lt;=18;i++)<br>
  {<br>
  setcolor(1);<br>
  rectangle(x0,y0,x1,y1);<br>
  x0=x0-5;<br>
  y0=y0-5;<br>
  x1=x1+5;<br>
  y1=y1+5;<br>
  }<br>
  settextstyle(DEFAULT_FONT,HORIZ_DIR,2);<br>
  outtextxy(150,40,&quot;How beautiful it is!&quot;);<br>
  line(130,60,480,60);<br>
  setcolor(2);<br>
  circle(269,269,137);<br>
  }<br>
  ==============================================================<br>
  <font color="#990000">【程序59】</font><br>
  题目：画图，综合例子。<br>
  1.程序分析：<br>
  2.程序源代码：<br>
  # define PAI 3.1415926<br>
  # define B 0.809<br>
  # include &quot;graphics.h&quot;<br>
  #include &quot;math.h&quot;<br>
  main()<br>
  {<br>
  int i,j,k,x0,y0,x,y,driver,mode;<br>
  float a;<br>
  driver=CGA;mode=CGAC0;<br>
  initgraph(&amp;driver,&amp;mode,&quot;&quot;);<br>
  setcolor(3);<br>
  setbkcolor(GREEN);<br>
  x0=150;y0=100;<br>
  circle(x0,y0,10);<br>
  circle(x0,y0,20);<br>
  circle(x0,y0,50);<br>
  for(i=0;i&lt;16;i++)<br>
  {<br>
  　a=(2*PAI/16)*i;<br>
  　x=ceil(x0+48*cos(a));<br>
  　y=ceil(y0+48*sin(a)*B);<br>
  　setcolor(2); line(x0,y0,x,y);}<br>
  setcolor(3);circle(x0,y0,60);<br>
  /* Make 0 time normal size letters */<br>
  settextstyle(DEFAULT_FONT,HORIZ_DIR,0);<br>