【程序59】
1 @. {2 [$ q# o! e2 `) a/ b1 D# ^题目：画图，综合例子。
% ]5 Q2 |5 S/ M* }1.程序分析：
/ s5 j4 ~& S9 U8 w1 T2.程序源代码：
# |$ J: f3 M% E1 d* D# define PAI 3.1415926( \, Q4 S( G. i
# define B 0.809
; y- e7 x+ h' a# include "graphics.h"5 }- ~: d0 k$ u( N
#include "math.h"
0 S$ a# ~! C: F) z. j* K. {: l; Dmain()
" H5 V }6 V1 Z5 s* e2 \( g{" P$ Q6 p; h: b1 _; X
int i,j,k,x0,y0,x,y,driver,mode;% J. z. G. e5 Z
float a;3 Y5 j" t- c& r4 D& {
driver=CGA;mode=CGAC0;6 ^/ N5 `- k. b5 X, V
initgraph(&driver,&mode,"");2 w; v4 F$ t8 T: D) m
setcolor(3); H: R7 V) G9 M4 m6 o
setbkcolor(GREEN);; g. b7 p5 v! J3 v1 ? t& j- a
x0=150;y0=100;* v& y1 ?& G. |) R, @1 ^9 c0 G/ R' r
circle(x0,y0,10);
$ e/ N6 ?) ^4 c1 G! B/ Jcircle(x0,y0,20);6 e: G) h# C# r" h. T$ Q, C
circle(x0,y0,50);
2 }% J0 M: `+ g* Wfor(i=0;i<16;i++)
. w' K8 m- E* w0 H/ d/ N{, D8 } f4 a3 x' K2 q! H; p
a=(2*PAI/16)*i;) D# {- [1 ]" p
x=ceil(x0+48*cos(a));
; U$ U h9 X9 l' U y=ceil(y0+48*sin(a)*B);
6 ]2 Q8 n5 q8 R setcolor(2); line(x0,y0,x,y);}
) s: a( c Y( n, E% asetcolor(3);circle(x0,y0,60);- v# W8 Y+ i! n. m- K( ]1 B
/* Make 0 time normal size letters */
1 I2 U! p5 T9 E9 x6 t: V ksettextstyle(DEFAULT_FONT,HORIZ_DIR,0);/ n1 N2 P6 x5 `0 m# T: S
outtextxy(10,170,"press a key");' K: T) ^7 }' @4 u6 |. K& t1 f6 k$ @
getch();, a8 N( t" X) i7 {
setfillstyle(HATCH_FILL,YELLOW);9 B8 A- @! n2 F" u8 W
floodfill(202,100,WHITE);6 X2 k2 Z j+ e C) X
getch();
3 C+ p8 X3 y w4 D. Cfor(k=0;k<=500;k++)) \, @/ Z7 A& H1 j- R! ^ w
{
9 |: y" x) X& c4 m setcolor(3);
4 S. ~+ @4 n9 y* P1 b2 | for(i=0;i<=16;i++) X0 T$ {+ C+ ^/ j$ n- P
{
# m+ p% ~. t: W; T$ K a=(2*PAI/16)*i+(2*PAI/180)*k;
. N- C1 O: B4 r8 ^ x=ceil(x0+48*cos(a));- F5 I( p+ F# l* G5 y7 X2 N9 V4 u
y=ceil(y0+48+sin(a)*B);- p- R6 c, A. j, i, w
setcolor(2); line(x0,y0,x,y);) c1 ? ~$ {8 f
}' `0 c H# p6 i
for(j=1;j<=50;j++)* P5 B+ G! Q! O7 m6 h, I
{
0 ^4 X, E( g$ v* C" T( `6 I a=(2*PAI/16)*i+(2*PAI/180)*k-1;
% u" P4 i# ~! w9 z1 @2 Y, v x=ceil(x0+48*cos(a));
& t+ G) {, j3 ?0 Q k5 i' N y=ceil(y0+48*sin(a)*B);
! q# K( L9 T4 n* Y0 l% S6 q line(x0,y0,x,y);
- @& W2 u( x# e: A7 I F }
. b8 l$ b7 u' Q% c8 o5 Z}
2 r, A {# H1 J0 I% Qrestorecrtmode();
, ^1 D2 \/ ~5 R5 S}
【程序60】3 t: R, [% p% ~$ l) c
题目：画图，综合例子。
( ~9 f. z0 L: J. h. }9 K7 ?1.程序分析：
6 e# P7 q) W! p+ @2.程序源代码：
: k8 s R5 f8 i5 }6 z4 a: N#include "graphics.h"7 ~% L% [( u4 K5 P0 Q3 b J' s
#define LEFT 0
' n0 A( d) @6 c) R# A0 Q K3 q#define TOP 0! F! o! T* u" l- N/ }! ^
#define RIGHT 639
9 M9 ^# g4 y9 I6 ]$ P#define BOTTOM 479
m S$ r( c9 O, x* H7 t. i#define LINES 400
1 k8 ^4 n- u% q/ M, K#define MAXCOLOR 15
/ m7 U6 m; x0 o+ r& y$ rmain()+ S" d) x( I/ ~/ E, F/ G0 h; z
{- w' F t2 _3 ?( @3 ]1 ?3 {0 M: b0 P
int driver,mode,error;
" |6 U$ X* r( s( gint x1,y1;- l" _, \) E4 Z- q
int x2,y2;
( I% C* L3 j) j- w6 \+ `; T) kint dx1,dy1,dx2,dy2,i=1;
- J# M! K" z/ _: |4 _- T9 I" n* t1 nint count=0;
' W4 F) x8 ^! N- b& bint color=0;% x# ~2 i' {: G4 X t
driver=VGA;
1 M% b3 ]# A) G9 a5 a7 \mode=VGAHI;
1 ?4 W& x1 B3 @5 jinitgraph(&driver,&mode,"");
" C, W7 o i0 rx1=x2=y1=y2=10; S! ^9 L5 {$ X# `+ b N5 `6 |, q2 J
dx1=dy1=2;
4 i' [' H) }$ b8 s$ ^' sdx2=dy2=3;
2 X" B$ d \' i5 C( K* y" zwhile(!kbhit())* @+ L$ h& t) B+ N: G$ N7 ?8 |
{+ I# S. } A, E& B0 B
line(x1,y1,x2,y2);
% _) f$ B) x( T x1+=dx1;y1+=dy1;) y! s( J9 T) d. [' s
x2+=dx2;y2+dy2;
4 x' |# E; k; C0 r if(x1<=LEFT||x1>=RIGHT)9 S$ l) r6 A; x
dx1=-dx1;2 T% I3 K3 H, y: \; t
if(y1<=TOP||y1>=BOTTOM)# Q& b) `- |9 k% E" a2 T$ Z4 i
dy1=-dy1;
! o% h# U( q% J- f3 h. R if(x2<=LEFT||x2>=RIGHT)! R/ e* `: Q# V! r2 S% [% b( D
dx2=-dx2;
. U5 ~! ]- Z- c- k if(y2<=TOP||y2>=BOTTOM)! ^8 h4 d1 O$ N* n0 N4 p( ^
dy2=-dy2;
3 |& |7 _# p2 o; Z3 n, x. a if(++count>LINES)
$ ?" ~, A, _, u {
! ^- x" |+ V6 C, b, V6 y4 w& Z setcolor(color);
$ V2 A x! z' f color=(color>=MAXCOLOR)?0:++color;
/ U/ e- H6 F9 u }+ f! ]2 i$ v+ t
}* E7 V4 l3 ?7 z2 f
closegraph();9 u" V$ T0 @: |6 W: R2 U
}
6 }$ j% Q- \" @/ ]4 H3 H, u【程序61】" Q- y; H1 s$ p- I, [) O
题目：打印出杨辉三角形（要求打印出10行如下图）
: }. i! F& y4 v! q6 y1.程序分析：6 A; L' a }( F6 B
1
e- `( Q+ _9 f 1 1. |1 h" k! ?- v. l, F0 F# v1 u
1 2 1
$ h1 s) _3 P* x; t1 C5 ?, C4 s 1 3 3 1
- V5 H3 n. I! B( o) e/ k 1 4 6 4 1( ~9 f$ u) ~. h; B' B
1 5 10 10 5 1
2 O. u7 a$ z) o2 N+ X% i% t2.程序源代码：: ^, X! H g7 @/ w F" ~
main()
Z% w, Z. d+ J0 c; |{int i,j;$ w5 E* `$ [9 [! T5 B) n
int a[10][10];
- m9 L3 y! W7 M+ u! \9 [printf("\n");
, G3 g, l* k. g+ @& rfor(i=0;i<10;i++)
# Y# H# O6 H2 F7 F) N {a[0]=1;
1 l1 c6 ~$ K7 e a=1;}9 t! [& j6 u% m: j; e7 K
for(i=2;i<10;i++)# p& Y2 y! F. {0 t4 f
for(j=1;j<i;j++)7 v; ^$ u% c- y- Q
a[j]=a[i-1][j-1]+a[i-1][j];9 m5 Q+ o$ c- y! k
for(i=0;i<10;i++)0 ]- w5 F, M! l# v" }: r. [
{for(j=0;j<=i;j++)
$ _2 A* o7 v/ T; }' k( ]8 D printf("%5d",a[j]);- ~. ^; W+ N* S: R: p7 |' v/ H* J
printf("\n");
; ]' U1 W: E% t, W) @7 E2 c }
8 @1 P6 c+ ]. ~' P) `) Q}
+ m0 L' w( K. O【程序62】9 k& ~# ^4 [4 a4 y' C7 U! A
题目：学习putpixel画点。
5 h4 d/ T: m9 F' n9 z8 ^* s2 G1.程序分析： " ~# M( X, y4 m" \
2.程序源代码：- q; C, a; f( L
#include "stdio.h"
7 c( p- |' K: T! ^$ C#include "graphics.h"
( D q5 e" D( }! P% I0 q+ o7 Zmain()- X! g; p( Z) ~; Z4 Q. k2 Z
{, I2 d. {8 H# w9 {. b7 K
int i,j,driver=VGA,mode=VGAHI;: W# r* C [1 s8 ]' J
initgraph(&driver,&mode,"");% r6 |8 y6 @! Z" z1 w5 ~
setbkcolor(YELLOW);$ v, O% D, \5 @- A
for(i=50;i<=230;i+=20)
- y' I: e" r6 L for(j=50;j<=230;j++)4 N6 S' s7 l& {/ h. @) D' Y
putpixel(i,j,1);, B* q: L1 f' n5 z' \5 R3 d
for(j=50;j<=230;j+=20)6 y" u3 Q9 u' Z# [! ~" p) Q
for(i=50;i<=230;i++)! @- B3 U5 E" f+ J' w: e
putpixel(i,j,1);# L6 L/ l/ A& P
}
' ]* h4 k" w, D' y( @2 k3 D) S
【程序63】' f9 B" v9 `) r) T. W, s* `# I
题目：画椭圆ellipse / R3 K. R K( h
1.程序分析：
4 ]" B( l Y: b2.程序源代码：
0 n* o3 R& n: Y#include "stdio.h"( W5 u- C7 w3 p/ p t1 M" ?0 }
#include "graphics.h". F2 J( n7 R, ^
#include "conio.h"
# o) A! ~3 }) kmain()
+ J3 f% N' m, H% B" m+ o! k{6 U: U& I4 V) R9 B# c
int x=360,y=160,driver=VGA,mode=VGAHI;1 I/ _8 i4 ]) l0 M% b3 @
int num=20,i;. f# h% @/ r" ]- P* z
int top,bottom;
1 Z; V. q* y$ Iinitgraph(&driver,&mode,"");
2 d4 Y# H E5 A) C5 B( itop=y-30;
. c- o, T( ]0 K& M' _; N6 g1 Jbottom=y-30;- _3 c5 \, K9 m
for(i=0;i<num;i++)' o; X5 }6 O. T9 k* Y9 J/ B$ k
{
2 V6 z+ q6 ?) fellipse(250,250,0,360,top,bottom);9 `& e- C7 _7 q# f8 B; K
top-=5;$ X! Z H) H) o) m$ u2 Q0 d/ N' K
bottom+=5;
9 v+ d. ?) y. r& Q9 i% O# d}
C1 T8 M/ E+ A/ t9 R: hgetch();$ S% T- x* M( S9 J/ A
}
【程序64】
. x0 q# b6 x: k/ C7 t. d: [6 L题目：利用ellipse and rectangle 画图。
8 t1 G7 ]- K& o$ x( k1.程序分析：0 ]+ K0 n( w, M, e) D4 d( z% Q B/ N
2.程序源代码：" I( Q" f$ G) m+ _3 [7 |
#include "stdio.h"& q) s$ L/ f- }& A
#include "graphics.h"- W9 E/ F7 q0 V$ j* V
#include "conio.h"
# H- z- Y! r; dmain()- F) q5 a5 R# f/ j
{
8 Y* z" G- B# w! W8 tint driver=VGA,mode=VGAHI;9 p4 [# a8 v# X; V" [/ R
int i,num=15,top=50;$ S0 q8 s' S- ]) M$ R2 n% V9 Z9 O1 Z* Q
int left=20,right=50;! y1 Z& W! {* Z0 {
initgraph(&driver,&mode,"");3 c* r: s% }, |
for(i=0;i<num;i++): H$ ~0 I. Q) O1 J
{0 U) K0 m; \2 C- ?
ellipse(250,250,0,360,right,left);% J4 w* Z9 Z' E o
ellipse(250,250,0,360,20,top);2 o/ r9 T+ b8 B6 q p8 p' s
rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2));
! h3 Z9 y* i/ ]& T) }& [- Oright+=5;
, a S/ t; K% T* A5 H( h1 Y) G8 fleft+=5;4 v) }1 X7 r- ?- E( S
top+=10;" w8 ~, ^( \* k
}. h P8 T! z4 t- e& F
getch();
0 j+ Z/ R5 L3 Y3 r8 t! x}
【程序65】
, w' z6 o" q: |7 \9 p/ W/ B题目：一个最优美的图案。
+ ]: J. L# t( Y/ w1.程序分析：- i- h0 b, B0 u+ ^0 C9 t
2.程序源代码：
9 j! M C* f4 D! N- g3 y#include "graphics.h"
0 J6 y5 @( u+ e Z- k4 }, H! V$ t5 |#include "math.h", [( P$ n/ ]( Q [8 w* _7 w, r4 ? {
#include "dos.h"
1 U2 t0 E; l& l$ T6 D#include "conio.h"
; Y: F- B1 x% Z' |9 T#include "stdlib.h"& G7 R7 Q! I# q" U7 d1 v
#include "stdio.h"$ }9 a8 B8 [) c& l/ ^
#include "stdarg.h"4 O: V$ @' h3 Z" Q6 |9 c0 N/ ]
#define MAXPTS 150 f! a) N E9 M. y& N7 M
#define PI 3.1415926' o, n1 M. o4 w ?* H
struct PTS {, y+ l/ R# D/ U% ]9 j
int x,y;! l* w2 K' w( T/ V7 _; ~! [
};
. [( h0 `+ R0 O( |/ Qdouble AspectRatio=0.85;- i1 h N* c1 C2 Y& ^/ B7 n7 i2 O
void LineToDemo(void)' j5 Q4 N; Q2 b7 e* Z
{" ^1 u3 G4 B# v
struct viewporttype vp;2 _( z" T. ~" E0 |: _7 l8 U d
struct PTS points[MAXPTS];* i$ I x; U( Y! S% e) Q" w
int i, j, h, w, xcenter, ycenter;
0 F, Q" c, g" [, w q! `( jint radius, angle, step;7 g7 m% [# N/ Z1 o8 d* j
double rads;0 u* \6 V# D9 Z. C
printf(" MoveTo / LineTo Demonstration" );, Q% W, O! n/ I, }6 l! S2 R
getviewsettings( &vp ); D- D; |' i2 V9 p0 s, v
h = vp.bottom - vp.top;
8 f' ]% x4 v @5 Zw = vp.right - vp.left;: Y& o" @/ h3 \5 ^
xcenter = w / 2; /* Determine the center of circle */2 e. @- e }5 E. S
ycenter = h / 2;# W) |3 u2 ~, ?! x
radius = (h - 30) / (AspectRatio * 2);- t2 V% e; Y8 q! w
step = 360 / MAXPTS; /* Determine # of increments */
' A5 N) \$ D& C3 }$ ^: I& gangle = 0; /* Begin at zero degrees */, A0 p5 E- d" S1 |! l6 `1 `
for( i=0 ; i<MAXPTS ; ++i ){ /* Determine circle intercepts */$ ~. |7 U; |5 S2 [+ O6 i3 K1 i
rads = (double)angle * PI / 180.0; /* Convert angle to radians */! a( a! C/ s+ [0 D
points.x = xcenter + (int)( cos(rads) * radius );
! F4 a2 }! v% R% V$ B9 Zpoints.y = ycenter - (int)( sin(rads) * radius * AspectRatio );1 n* D- C1 h* }
angle += step; /* Move to next increment *// Y' s( b' ^: ~1 E6 g
}
. n7 R* {4 S/ _5 ~- bcircle( xcenter, ycenter, radius ); /* Draw bounding circle */
* \* s" x/ `( @. d9 g$ Rfor( i=0 ; i<MAXPTS ; ++i ){ /* Draw the cords to the circle */0 U5 ]6 X' L4 K7 O
for( j=i ; j<MAXPTS ; ++j ){ /* For each remaining intersect */* v! j0 {# l: p. Y8 i% h. d
moveto(points.x, points.y); /* Move to beginning of cord */
9 M) B; b3 p$ dlineto(points[j].x, points[j].y); /* Draw the cord */$ c3 Y: S3 E& u: R. R
} } }
1 I8 S* s9 ~5 k1 X4 A- t! rmain()& k4 V& }, J! B: N
{int driver,mode;
- M) K6 k- s# Fdriver=CGA;mode=CGAC0;3 h" L- P& D* e/ q/ f1 B+ ]
initgraph(&driver,&mode,"");
. _8 V; E, _4 s0 z" asetcolor(3);; e# R1 M& D1 d1 Z- O% o
setbkcolor(GREEN);. L+ P9 E8 P3 `+ {2 J) Z1 T/ D! C
LineToDemo();}
关于图形的程序最好在纯dos下运行，c的图形函数有可能和windows冲突，出现非法操作
) u! M4 b. n' A$ C0 |$ E7 j【程序66】
1 I- ^/ B9 T( H/ g% }! K0 u& D3 N题目：输入3个数a,b,c，按大小顺序输出。 : R# T$ P1 u# [; ], n
1.程序分析：利用指针方法。
! X' M/ I8 V0 q: g) k2.程序源代码：
) ~. Q' A2 t0 _/*pointer*/
( b( E2 Q5 u! z/ O/ l: H- ^1 Smain()' l8 J) g7 s8 W0 `# }
{
0 w/ }/ w$ k4 N) W I. L m( R1 V: \int n1,n2,n3;
2 s9 o$ S& b: ^; X* ]int *pointer1,*pointer2,*pointer3;
3 ]( y3 o# K, ~& I; h6 }9 Rprintf("please input 3 number:n1,n2,n3:");/ J6 h9 N1 L' n, O7 v
scanf("%d,%d,%d",&n1,&n2,&n3);2 I9 L) x0 Y' G3 J9 Q
pointer1=&n1;# q! G6 W. e3 W4 ]1 Q# G. r& ]; Z
pointer2=&n2;6 d3 _# L8 C- V' a7 Z3 `
pointer3=&n3;
$ d8 _0 ^% u# G, w) j6 Wif(n1>n2) swap(pointer1,pointer2);' t/ l8 r/ w8 d* B# D5 t8 ]
if(n1>n3) swap(pointer1,pointer3);
9 [2 K3 S3 f9 z* M: o1 @* d3 Hif(n2>n3) swap(pointer2,pointer3);
% J. }& @2 ^) p& A2 Aprintf("the sorted numbers are:%d,%d,%d\n",n1,n2,n3);
}! J8 G# E5 y6 U0 f7 M5 u6 }}! k0 e* Z' e* S5 h8 Y2 w7 W
swap(p1,p2)
) v1 u( L3 J" x6 x5 a1 L! Wint *p1,*p2;4 C0 ~% g7 \; h, L
{int p;
# ]9 ^/ S, @* Y3 [& i! dp=*p1;*p1=*p2;*p2=p;
# l7 K5 u: h) ]* _5 h3 q! f# s! \}3 |6 |& Q6 k; V: D, p
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