| main() { int i,j; int a[10][10]; printf("\n"); for(i=0;i<10;i++) { a[i][0]=1; a[i][i]=1;} for(i=2;i<10;i++) for(j=1;j<i;j++) a[i][j]=a[i-1][j-1]+a[i-1][j]; for(i=0;i<10;i++) { for(j=0;j<=i;j++) printf("%5d",a[i][j]); printf("\n"); } } } |
| #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); } |
| #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<num;i++) { ellipse(250,250,0,360,top,bottom); top-=5; bottom+=5; } getch(); } |
#p#副标题#e#
「程序64」
题目：利用ellipse and rectangle 画图。
1.程序分析：
2.程序源代码：
| #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<num;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(); } |
| #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 ; i<MAXPTS ; ++i ){ /* Determine circle intercepts */ rads = (double)angle * PI / 180.0; /* Convert angle to radians */ points[i].x = xcenter + (int)( cos(rads) * radius ); points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio ); angle += step; /* Move to next increment */ } circle( xcenter, ycenter, radius ); /* Draw bounding circle */ for( i=0 ; i<MAXPTS ; ++i ){ /* Draw the cords to the circle */ for( j=i ; j<MAXPTS ; ++j ){ /* For each remaining intersect */ moveto(points[i].x, points[i].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(); } |
#p#副标题#e#
「程序66」
题目：输入3个数a，b，c，按大小顺序输出。
1.程序分析：利用指针方法。
2.程序源代码：
| /*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; } |
| 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[i]); 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<arr_end;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<array+9;p++) printf("%d,",*p); printf("%d\n",array[9]); } |
「程序68」
题目：有n个整数，使其前面各数顺序向后移m个位置，最后m个数变成最前面的m个数
1.程序分析：
2.程序源代码：
| main() { int number[20],n,m,i; printf("the total numbers is:"); scanf("%d",&n); printf("back m:"); scanf("%d",&m); for(i=0;i<n-1;i++) scanf("%d,",&number[i]); scanf("%d",&number[n-1]); move(number,n,m); for(i=0;i<n-1;i++) printf("%d,",number[i]); printf("%d",number[n-1]); } move(array,n,m) int n,m,array[20]; { int *p,array_end; array_end=*(array+n-1); for(p=array+n-1;p>array;p--) *p=*(p-1); *array=array_end; m--; if(m>0) move(array,n,m); } |
| #define nmax 50 main() { int i,k,m,n,num[nmax],*p; printf("please input the total of numbers:"); scanf("%d",&n); p=num; for(i=0;i<n;i++) *(p+i)=i+1; i=0; k=0; m=0; while(m<n-1) { if(*(p+i)!=0) k++; if(k==3) { *(p+i)=0; k=0; m++; } i++; if(i==n) i=0; } while(*p==0) p++; printf("%d is left\n",*p); } |
| main() { int len; char *str[20]; printf("please input a string:\n"); scanf("%s",str); len=length(str); printf("the string has %d characters.",len); } length(p) char *p; { int n; n=0; while(*p!='\0') { n++; p++; } return n; } |
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