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<div align="center"><font color="#FFFF00" size="5">经典c程序100例==51--60 </font></div>
<p>【程序51】<br>
题目：学习使用按位与 & 。 <br>
1.程序分析：0&0=0; 0&1=0; 1&0=0; 1&1=1<br>
2.程序源代码：<br>
#include "stdio.h"<br>
main()<br>
{<br>
int a,b;<br>
a=077;<br>
b=a&3;<br>
printf("\40: The a & b(decimal) is %d \n",b);<br>
b&=7;<br>
printf("\40: The a & b(decimal) is %d \n",b);<br>
}<br>
==============================================================<br>
【程序52】<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 "stdio.h"<br>
main()<br>
{<br>
int a,b;<br>
a=077;<br>
b=a|3;<br>
printf("\40: The a & b(decimal) is %d \n",b);<br>
b|=7;<br>
printf("\40: The a & b(decimal) is %d \n",b);<br>
}<br>
==============================================================<br>
【程序53】<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 "stdio.h"<br>
main()<br>
{<br>
int a,b;<br>
a=077;<br>
b=a^3;<br>
printf("\40: The a & b(decimal) is %d \n",b);<br>
b^=7;<br>
printf("\40: The a & b(decimal) is %d \n",b);<br>
}<br>
==============================================================<br>
【程序54】<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<<4)<br>
(3)将上面二者进行&运算。<br>
2.程序源代码：<br>
main()<br>
{<br>
unsigned a,b,c,d;<br>
scanf("%o",&a);<br>
b=a>>4;<br>
c=~(~0<<4);<br>
d=b&c;<br>
printf("%o\n%o\n",a,d);<br>
}<br>
==============================================================<br>
【程序55】<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 "stdio.h"<br>
main()<br>
{<br>
int a,b;<br>
a=234;<br>
b=~a;<br>
printf("\40: The a's 1 complement(decimal) is %d \n",b);<br>
a=~a;<br>
printf("\40: The a's 1 complement(hexidecimal) is %x \n",a);<br>
} <br>
==============================================================<br>
【程序56】<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 "graphics.h"<br>
main()<br>
{int driver,mode,i;<br>
float j=1,k=1;<br>
driver=VGA;mode=VGAHI;<br>
initgraph(&driver,&mode,"");<br>
setbkcolor(YELLOW);<br>
for(i=0;i<=25;i++)<br>
{<br>
setcolor(8);<br>
circle(310,250,k);<br>
k=k+j;<br>
j=j+0.3;<br>
}<br>
} <br>
==============================================================<br>
【程序57】<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 "graphics.h"<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(&driver,&mode,"");<br>
setbkcolor(GREEN);<br>
x0=263;y0=263;y1=275;x1=275;<br>
for(i=0;i<=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<=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>
【程序58】<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 "graphics.h"<br>
main()<br>
{int x0,y0,y1,x1,driver,mode,i;<br>
driver=VGA;mode=VGAHI;<br>
initgraph(&driver,&mode,"");<br>
setbkcolor(YELLOW);<br>
x0=263;y0=263;y1=275;x1=275;<br>
for(i=0;i<=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,"How beautiful it is!");<br>
line(130,60,480,60);<br>
setcolor(2);<br>
circle(269,269,137);<br>
}<br>
==============================================================<br>
【程序59】<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 "graphics.h"<br>
#include "math.h"<br>
main()<br>
{<br>
int i,j,k,x0,y0,x,y,driver,mode;<br>
float a;<br>
driver=CGA;mode=CGAC0;<br>
initgraph(&driver,&mode,"");<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<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>
outtextxy(10,170,"press a key");<br>
getch();<br>
setfillstyle(HATCH_FILL,YELLOW);<br>
floodfill(202,100,WHITE);<br>
getch();<br>
for(k=0;k<=500;k++)<br>
{<br>
setcolor(3);<br>
for(i=0;i<=16;i++)<br>
{<br>
a=(2*PAI/16)*i+(2*PAI/180)*k;<br>
x=ceil(x0+48*cos(a));<br>
y=ceil(y0+48+sin(a)*B);<br>
setcolor(2); line(x0,y0,x,y);<br>
}<br>
for(j=1;j<=50;j++)<br>
{<br>
a=(2*PAI/16)*i+(2*PAI/180)*k-1;<br>
x=ceil(x0+48*cos(a));<br>
y=ceil(y0+48*sin(a)*B);<br>
line(x0,y0,x,y);<br>
}<br>
}<br>
restorecrtmode();<br>
}<br>
==============================================================<br>
【程序60】<br>
题目：画图，综合例子。 <br>
1.程序分析：<br>
2.程序源代码：<br>
#include "graphics.h"<br>
#define LEFT 0<br>
#define TOP 0<br>
#define RIGHT 639<br>
#define BOTTOM 479<br>
#define LINES 400<br>
#define MAXCOLOR 15<br>
main()<br>
{<br>
int driver,mode,error;<br>
int x1,y1;<br>
int x2,y2;<br>
int dx1,dy1,dx2,dy2,i=1;<br>
int count=0;<br>
int color=0;<br>
driver=VGA;<br>
mode=VGAHI;<br>
initgraph(&driver,&mode,"");<br>
x1=x2=y1=y2=10;<br>
dx1=dy1=2;<br>
dx2=dy2=3;<br>
while(!kbhit())<br>
{<br>
line(x1,y1,x2,y2);<br>
x1+=dx1;y1+=dy1;<br>
x2+=dx2;y2+dy2;<br>
if(x1<=LEFT||x1>=RIGHT)<br>
dx1=-dx1;<br>
if(y1<=TOP||y1>=BOTTOM)<br>
dy1=-dy1;<br>
if(x2<=LEFT||x2>=RIGHT)<br>
dx2=-dx2;<br>
if(y2<=TOP||y2>=BOTTOM)<br>
dy2=-dy2;<br>
if(++count>LINES)<br>
{<br>
setcolor(color);<br>
color=(color>=MAXCOLOR)?0:++color;<br>
}<br>
}<br>
closegraph();<br>
}<br>
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