#define SMA < #define EQ == #include "test.h" / ... C語言經典算法50-67 " />
【程序50】 題目:#include 的應用練習 1.程序分析: 2.程序源代碼: test.h 文件如下: #define LAG > #define SMA < #define EQ == #include "test.h" /*一個新文件50.c,包含test.h*/ #include "stdio.h" void main() { int i=10; int j=20; if(i LAG j) printf("\40: %d larger than %d \n",i,j); else if(i EQ j) printf("\40: %d equal to %d \n",i,j); else if(i SMA j) printf("\40:%d smaller than %d \n",i,j); else printf("\40: No such value.\n"); } 【程序51】 題目:學習使用按位與 & 。 1.程序分析:0&0=0; 0&1=0; 1&0=0; 1&1=1 2.程序源代碼: #include "stdio.h" main() { int a,b; a=077; b=a&3; printf("\40: The a & b(decimal) is %d \n",b); b&=7; printf("\40: The a & b(decimal) is %d \n",b); } ============================================================== 【程序52】 題目:學習使用按位或 | 。 1.程序分析:0|0=0; 0|1=1; 1|0=1; 1|1=1 2.程序源代碼: #include "stdio.h" main() { int a,b; a=077; b=a|3; printf("\40: The a & b(decimal) is %d \n",b); b|=7; printf("\40: The a & b(decimal) is %d \n",b); } ============================================================== 【程序53嵌入式信盈達企鵝要妖氣嗚嗚吧久零紀要】 題目:學習使用按位異或 ^ 。 1.程序分析:0^0=0; 0^1=1; 1^0=1; 1^1=0 2.程序源代碼: #include "stdio.h" main() { int a,b; a=077; b=a^3; printf("\40: The a & b(decimal) is %d \n",b); b^=7; printf("\40: The a & b(decimal) is %d \n",b); } ============================================================== 【程序54】 題目:取一個整數a從右端開始的4~7位。 程序分析:可以這樣考慮: (1)先使a右移4位。 (2)設置一個低4位全為1,其余全為0的數。可用~(~0<<4) (3)將上面二者進行&運算。 2.程序源代碼: main() { unsigned a,b,c,d; scanf("%o",&a); b=a>>4; c=~(~0<<4); d=b&c; printf("%o\n%o\n",a,d); } ============================================================== 【程序55】 題目:學習使用按位取反~。 1.程序分析:~0=1; ~1=0; 2.程序源代碼: #include "stdio.h" main() { int a,b; a=234; b=~a; printf("\40: The a's 1 complement(decimal) is %d \n",b); a=~a; printf("\40: The a's 1 complement(hexidecimal) is %x \n",a); } ============================================================== 【程序56】 題目:畫圖,學用circle畫圓形。 1.程序分析: 2.程序源代碼: /*circle*/ #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; } } ============================================================== 【程序57】 題目:畫圖,學用line畫直線。 1.程序分析: 2.程序源代碼: #include "graphics.h" main() {int driver,mode,i; float x0,y0,y1,x1; float j=12,k; driver=VGA;mode=VGAHI; initgraph(&driver,&mode,""); setbkcolor(GREEN); x0=263;y0=263;y1=275;x1=275; for(i=0;i<=18;i++) { setcolor(5); line(x0,y0,x0,y1); x0=x0-5; y0=y0-5; x1=x1+5; y1=y1+5; j=j+10; } x0=263;y1=275;y0=263; for(i=0;i<=20;i++) { setcolor(5); line(x0,y0,x0,y1); x0=x0+5; y0=y0+5; y1=y1-5; } } ============================================================== 【程序58】 題目:畫圖,學用rectangle畫方形。 1.程序分析:利用for循環控制100-999個數,每個數分解出個位,十位,百位。 2.程序源代碼: #include "graphics.h" main() {int x0,y0,y1,x1,driver,mode,i; driver=VGA;mode=VGAHI; initgraph(&driver,&mode,""); setbkcolor(YELLOW); x0=263;y0=263;y1=275;x1=275; for(i=0;i<=18;i++) { setcolor(1); rectangle(x0,y0,x1,y1); x0=x0-5; y0=y0-5; x1=x1+5; y1=y1+5; } settextstyle(DEFAULT_FONT,HORIZ_DIR,2); outtextxy(150,40,"How beautiful it is!"); line(130,60,480,60); setcolor(2); circle(269,269,137); } ============================================================== 【程序59】 題目:畫圖,綜合例子。 1.程序分析: 2.程序源代碼: # define PAI 3.1415926 # define B 0.809 # include "graphics.h" #include "math.h" main() { int i,j,k,x0,y0,x,y,driver,mode; float a; driver=CGA;mode=CGAC0; initgraph(&driver,&mode,""); setcolor(3); setbkcolor(GREEN); x0=150;y0=100; circle(x0,y0,10); circle(x0,y0,20); circle(x0,y0,50); for(i=0;i<16;i++) { a=(2*PAI/16)*i; x=ceil(x0+48*cos(a)); y=ceil(y0+48*sin(a)*B); setcolor(2); line(x0,y0,x,y);} setcolor(3);circle(x0,y0,60); /* Make 0 time normal size letters */ settextstyle(DEFAULT_FONT,HORIZ_DIR,0); outtextxy(10,170,"press a key"); getch(); setfillstyle(HATCH_FILL,YELLOW); floodfill(202,100,WHITE); getch(); for(k=0;k<=500;k++) { setcolor(3); for(i=0;i<=16;i++) { a=(2*PAI/16)*i+(2*PAI/180)*k; x=ceil(x0+48*cos(a)); y=ceil(y0+48+sin(a)*B); setcolor(2); line(x0,y0,x,y); } for(j=1;j<=50;j++) { a=(2*PAI/16)*i+(2*PAI/180)*k-1; x=ceil(x0+48*cos(a)); y=ceil(y0+48*sin(a)*B); line(x0,y0,x,y); } } restorecrtmode(); } ============================================================== 【程序60】 題目:畫圖,綜合例子。 1.程序分析: 2.程序源代碼: #include "graphics.h" #define LEFT 0 #define TOP 0 #define RIGHT 639 #define BOTTOM 479 #define LINES 400 #define MAXCOLOR 15 main() { int driver,mode,error; int x1,y1; int x2,y2; int dx1,dy1,dx2,dy2,i=1; int count=0; int color=0; driver=VGA; mode=VGAHI; initgraph(&driver,&mode,""); x1=x2=y1=y2=10; dx1=dy1=2; dx2=dy2=3; while(!kbhit()) { line(x1,y1,x2,y2); x1+=dx1;y1+=dy1; x2+=dx2;y2+dy2; if(x1<=LEFT||x1>=RIGHT) dx1=-dx1; if(y1<=TOP||y1>=BOTTOM) dy1=-dy1; if(x2<=LEFT||x2>=RIGHT) dx2=-dx2; if(y2<=TOP||y2>=BOTTOM) dy2=-dy2; if(++count>LINES) { setcolor(color); color=(color>=MAXCOLOR)?0:++color; } } closegraph(); } 【程序61】 題目:打印出楊輝三角形(要求打印出10行如下圖) 1.程序分析: 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 2.程序源代碼: main() {int i,j; int a[10][10]; printf("\n"); for(i=0;i<10;i++) {a[0]=1; a=1;} for(i=2;i<10;i++) for(j=1;j a[j]=a[i-1][j-1]+a[i-1][j]; for(i=0;i<10;i++) {for(j=0;j<=i;j++) printf("]",a[j]); printf("\n"); } } ============================================================== 【程序62】 題目:學習putpixel畫點。 1.程序分析: 2.程序源代碼: #include "stdio.h" #include "graphics.h" main() { int i,j,driver=VGA,mode=VGAHI; initgraph(&driver,&mode,""); setbkcolor(YELLOW); for(i=50;i<=230;i+=20) for(j=50;j<=230;j++) putpixel(i,j,1); for(j=50;j<=230;j+=20) for(i=50;i<=230;i++) putpixel(i,j,1); } ============================================================== 【程序63】 題目:畫橢圓ellipse 1.程序分析: 2.程序源代碼: #include "stdio.h" #include "graphics.h" #include "conio.h" main() { int x=360,y=160,driver=VGA,mode=VGAHI; int num=20,i; int top,bottom; initgraph(&driver,&mode,""); top=y-30; bottom=y-30; for(i=0;i{ ellipse(250,250,0,360,top,bottom); top-=5; bottom+=5; } getch(); } ============================================================== 【程序64】 題目:利用ellipse and rectangle 畫圖。 1.程序分析: 2.程序源代碼: #include "stdio.h" #include "graphics.h" #include "conio.h" main() { int driver=VGA,mode=VGAHI; int i,num=15,top=50; int left=20,right=50; initgraph(&driver,&mode,""); for(i=0;i{ ellipse(250,250,0,360,right,left); ellipse(250,250,0,360,20,top); rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2)); right+=5; left+=5; top+=10; } getch(); } ============================================================== 【程序65】 題目:一個最優美的圖案。 1.程序分析: 2.程序源代碼: #include "graphics.h" #include "math.h" #include "dos.h" #include "conio.h" #include "stdlib.h" #include "stdio.h" #include "stdarg.h" #define MAXPTS 15 #define PI 3.1415926 struct PTS { int x,y; }; double AspectRatio=0.85; void LineToDemo(void) { struct viewporttype vp; struct PTS points[MAXPTS]; int i, j, h, w, xcenter, ycenter; int radius, angle, step; double rads; printf(" MoveTo / LineTo Demonstration" ); getviewsettings( &vp ); h = vp.bottom - vp.top; w = vp.right - vp.left; xcenter = w / 2; /* Determine the center of circle */ ycenter = h / 2; radius = (h - 30) / (AspectRatio * 2); step = 360 / MAXPTS; /* Determine # of increments */ angle = 0; /* Begin at zero degrees */ for( i=0 ; irads = (double)angle * PI / 180.0; /* Convert angle to radians */ points.x = xcenter + (int)( cos(rads) * radius ); points.y = ycenter - (int)( sin(rads) * radius * AspectRatio ); angle += step; /* Move to next increment */ } circle( xcenter, ycenter, radius ); /* Draw bounding circle */ for( i=0 ; ifor( j=i ; jmoveto(points.x, points.y); /* Move to beginning of cord */ lineto(points[j].x, points[j].y); /* Draw the cord */ } } } main() {int driver,mode; driver=CGA;mode=CGAC0; initgraph(&driver,&mode,""); setcolor(3); setbkcolor(GREEN); LineToDemo();} ============================================================== 【程序66】 題目:輸入3個數a,b,c,按大小順序輸出。 1.程序分析:利用指針方法。 2.程序源代碼: /*pointer*/ main() { int n1,n2,n3; int *pointer1,*pointer2,*pointer3; printf("please input 3 number:n1,n2,n3:"); scanf("%d,%d,%d",&n1,&n2,&n3); pointer1=&n1; pointer2=&n2; pointer3=&n3; if(n1>n2) swap(pointer1,pointer2); if(n1>n3) swap(pointer1,pointer3); if(n2>n3) swap(pointer2,pointer3); printf("the sorted numbers are:%d,%d,%d\n",n1,n2,n3); } swap(p1,p2) int *p1,*p2; {int p; p=*p1;*p1=*p2;*p2=p; } ============================================================== 【程序67】 題目:輸入數組,最大的與第一個元素交換,最小的與最后一個元素交換,輸出數組。 1.程序分析:譚浩強的書中答案有問題。 2.程序源代碼: main() { int number[10]; input(number); max_min(number); output(number); } input(number) int number[10]; {int i; for(i=0;i<9;i++) scanf("%d,",&number); scanf("%d",&number[9]); } max_min(array) int array[10]; {int *max,*min,k,l; int *p,*arr_end; arr_end=array+10; max=min=array; for(p=array+1;p if(*p>*max) max=p; else if(*p<*min) min=p; k=*max; l=*min; *p=array[0];array[0]=l;l=*p; *p=array[9];array[9]=k;k=*p; return; } output(array) int array[10]; { int *p; for(p=array;p printf("%d,",*p); printf("%d\n",array[9]); } ============================================================== |