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《程序设计技术》（第三版）习题参考答案及说明习题1四、程序设计题//xt010401.cpp#includestdio.h#definePI3.1415926voidmain(){doubler,h;printf(请输入半径r和高h：);scanf(%lf,%lf,&r,&h);printf(圆半径:%lf\n,2*PI*r);printf(圆面积：%lf\n,PI*r*r);printf(圆球表面积：%lf\n,4*PI*r*r);printf(圆球体积：%lf\n,4.0/3*PI*r*r);printf(圆柱体积：%lf\n,PI*r*r*h);}//xt010402.cpp#includestdio.hvoidmain(){intc;printf(Inputacharacter:);c=getchar();printf(%c\t%d\n,c,c);}//xt010403.cpp#includestdio.hvoidmain(){intx,y,h=30,f=90;x=(4*h-f)/2;y=(f-2*h)/2;printf(鸡：%d,兔：%d\n,x,y);}//xt010404.cpp#includestdio.h#includemath.hvoidmain(){doublea,b,c,s,area;printf(请输入三角形的三条边长（注意三条边长应能够构成三角形）：);scanf(%lf,%lf,%lf,&a,&b,&c);s=(a+b+c)/2;area=sqrt(s*(s-a)*(s-b)*(s-c));printf(三角形的面积是:%lf\n,area);}//xt010405.cpp#includestdio.hvoidmain(){doublef,c;printf(请输入华氏温度：);scanf(%lf,&f);c=5.0/9.0*(f-32);printf(与华氏温度%.2lf对应的摄氏温度是：%.2lf\n,f,c);}//xt010406.cpp#includestdio.hvoidmain(){charc1,c2,c3,c4,c5;printf(请输入需加密的字符串（5个字符）：);c1=getchar();c2=getchar();c3=getchar();c4=getchar();c5=getchar();printf(加密后的字符串是：);putchar(c1+5);putchar(c2+5);putchar(c3+5);putchar(c4+5);putchar(c5+5);printf(\n);}习题2四、程序设计题/*xt020401.cpp*/#includestdio.hvoidmain(){intnum;printf(****Inputnum:****\n);scanf(%d,&num);if(num%3==0&&num%5==0&&num%7==0)printf(**YES!**\n);elseprintf(**NO!**\n);}/*xt020402.cpp*/#includestdio.hvoidmain(){inth=15;floatx1=2,y1=2,x2=-2,y2=2,x3=-2,y3=-2,x4=2,y4=-2,x,y,d1,d2,d3,d4;printf(***input:x,y***\n);scanf(%f,%f,&x,&y);d1=(x-x4)*(x-x4)+(y-y4)*(y-y4);/*点（x,y）到各中心点的距离*/d2=(x-x1)*(x-x1)+(y+y1)*(y+y1);d3=(x-x2)*(x-x2)+(y-y2)*(y-y2);d4=(x+x3)*(x+x3)+(y+y3)*(y+y3);if(d11&&d21&&d31&&d41)/*判断该点是否在塔外*/h=0;printf(x=%f,y=%f\n,x,y);printf(h=%d\n,h);}调试该程序时请输入两组数据：0.5，0.72.1，2.3/*xt020403.cpp*/#includestdio.hvoidmain(){inti,j,k,n;for(n=100;n=999;n++){i=n/100;j=n/10-i*10;k=n%10;if(n==i*i*i+j*j*j+k*k*k)printf(%d\n,n);}}/*xt020404.cpp*/#includestdio.h#includemath.h#defineEPS1.0e-6voidmain(){floate=1,t;longintj=1,n=1;do{j=j*n;t=1.0/j;e=e+t;n++;}while(fabs(t)=EPS);printf(e=%f\n,e);}/*xt020405.cpp*/#includestdio.hvoidmain(){intnum=1;do{if((num+3)%5==0&&(num-3)%6==0)break;num+=1;}while(1);printf(num=%d\n,num);}/*xt020406.cpp*/#includestdio.hvoidmain(){intnum;for(num=1;num=99;num++)if(num*num%10==num||num*num%100==num)printf(%4d,%5d,num,num*num);printf(\n);}/*xt020407.cpp*/#includestdio.hvoidmain(){intn,k=1;floats=0;for(n=1;n=10000;n++){s=s+1.0/(2.0*n-1)*k;k=-k;}printf(PI=%f\n,4*s);}/*xt020408.cpp*/#includestdio.hvoidmain(){intn10,n5,n2,n1;for(n10=1;n10=9;n10++)for(n5=1;n5=17;n5++)for(n2=1;n2=37;n2++){n1=40-n10-n5-n2;if(n1=1&&n10*10+n5*5+n2*2+n1==100)printf(n10=%d,n5=%d,n2=%d,n1=%d\n,n10,n5,n2,n1);}}/*xt020409.cpp*/#includestdio.hvoidmain(){floatsn=100,hn=sn/2;intn=2;while(n=10){sn+=2*hn;hn=hn/2;n++;}printf(%f,%f\n,sn,hn);}/*xt020410.cpp*/#includestdio.hvoidmain(){intday,x1,x2=1;for(day=9;day0;day--){x1=(x2+1)*2;x2=x1;}printf(Total=%d\n,x1);}习题3四、程序设计题//xt030401.cpp#includestdio.h#includestdlib.h#includetime.hvoidmain(void){intnum[10],a;;srand((unsigned)time(NULL));printf(请输入一个2位数，试试您是否能中奖：);scanf(%d,&a);for(inti=0;i10;i++){num[i]=(rand()+10)%100;if(a==num[i])printf(猜中一个数%d下标是%d,a,i);}}printf(-------------------------\n);for(i=0;i10;i++)printf(%d\t,num[i]);}//xt030402.cpp#includestdio.h#includestdlib.h#includetime.hvoidmain(void){inta[5]={23,45,60,67,88},x,i,j,yes=0;for(i=0;i5;i++)printf(%d,,a[i]);printf(\nwhichnumberdoyouwanttodelete?\n);scanf(%d,&x);for(i=0;i5;i++)if(a[i]==x){yes=1;for(j=i;j5;j++)a[j]=a[j+1];}if(yes==1)for(i=0;i4;i++)printf(%d,,a[i]);elseprintf(Thenumberyouwantdoesn'texist);}//xt030403.cpp#includestdio.h#includestdlib.h#includetime.h#defineSIZE1000voidmain(){intx,a[SIZE],size,sum=0;srand((unsigned)time(NULL));while((size=rand()%1000)200);printf(\nRandomizlistsize(1000):%d,size);printf(\nAutomakea%dsizeoflist:\n,size);for(x=0;xsize;x++){a[x]=rand()%1000;printf(%d\t,a[x]);sum+=arr[x];}printf(\nThesumofarrayelementsis%d,sum);}//xt030404.cpp#includestdio.h#includestdlib.h#includetime.h#defineSIZE100voidmain(){intx,a[SIZE],max=0,min=1000,b1,b2;srand((unsigned)time(NULL));printf(\nAutomakea%dsizeoflist:\n,size);for(x=0;xSIZE;x++){a[x]=rand()%1000;printf(%d\t,a[x]);}for(x=0;xSIZE;x++){if(a[x]max)max=a[x],b1=x;if(a[x]min)min=a[x],b2=x;}printf(\nThearrayelementsmax=%din%d\nmin=%din%d\n,max,b1,min,b2);}//xt030405.cpp#includestdio.h#defineSIZE100#defineKIND5voidmain(){intx,y,len,total[KIND+1];inta[]={1,1,1,1,2,2,2,3,5,5,5,5,1,1,3,3,3,3,3,2,2,2,5,5,5};len=sizeof(a)/sizeof(a[0]);for(x=0;xKIND+1;x++){total[x]=0;}for(y=1;yKIND+1;y++){for(x=0;xlen;x++){if(a[x]==y)total[y]++;}}printf(\nThelistkinded:\n);for(x=0;xlen;x++)printf(%d,a[x]);printf(\nThetotalresult:);for(x=1;xKIND+1;x++)printf(%d-%d,,x,total[x]);}//xt030406.cpp#defineN26#includestdio.hintmain(void){staticinta[N+1],b[N+1];inti,j,s,m,p;scanf(%d%d,&s,&m);for(i=1;i=N;i++)a[i]=i;i=s-1;j=0;p=0;while(pN){i++;bh:if(iN)i-=N;if(a[i]==0){i++;gotobh;}j++;if(j%m==0){p++;b[p]=a[i];a[i]=0;j=0;}}for(i=1