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《C程序设计》课后习题答案(4-6章).doc 24页

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  • 2022-04-22 11:48:22 发布

《C程序设计》课后习题答案(4-6章).doc

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'《C程序设计》课后习题答案(4-6章)第四章8、#definePI3.1415926#includevoidmain(){floath,r,l,s,sq,vq,vz;printf("pleaseinputr,h:");scanf("%f,%f",&r,&h);l=2*PI*r;s=r*r*PI;sq=4*PI*r*r;vq=4.0/3.0*PI*r*r*r;vz=PI*r*r*h;printf("l=%6.2fn",l);printf("s=%6.2fn",s);printf("sq=%6.2fn",sq);printf("vq=%6.2fn",vq);printf("vz=%6.2fn",vz);} 9、#includevoidmain(){floatc,f;printf("pleaseinputf:");scanf("%f",&f);c=(5.0/9.0)*(f-32);printf("c:%6.2fn",c);}第五章5、#includevoidmain(){intx,y;printf("pleaseinputx:");scanf("%d",&x);if(x<1){y=x;printf("x=%d,y=x=%dn",x,y);} elseif(x<10){y=2*x-1;printf("x=%d,y=2*x-1=%dn",x,y);}else{y=3*x-11;printf("x=%d,y=3*x-11=%dn",x,y);}}6、#includevoidmain(){floatscore;chargrade;printf("pleaseinputthestudentscore:");scanf("%f",&score);while((score>100)||(score<0)){printf("error,pleaseinputagain!n");printf("pleaseinputthestudentscore:");scanf("%f",&score); }switch((int)(score/10)){case10:case9:grade="A";break;case8:grade="B";break;case7:grade="C";break;case6:grade="D";break;case5:case4:case3:case2:case1:case0:grade="E";}printf("scoreis%f,gradeis%cn",score,grade);}7、#include#include voidmain(){longintnum;intindiv,ten,hundred,thousand,ten_thousand,place;printf("pleaseinputaninteger(0-99999):");scanf("%ld",&num);if(num>9999)place=5;elseif(num>999)place=4;elseif(num>99)place=3;elseif(num>9)place=2;elseplace=1;printf("Totaldigits:%dn",place);printf("Foreachnumber:");ten_thousand=num/10000;thousand=(int)(num-ten_thousand*10000)/1000;hundred=(int)(num-ten_thousand*10000-thousand*1000)/100;ten=(int)(num-ten_thousand*10000-thousand*1000-hundred*100)/10; indiv=(int)(num-ten_thousand*10000-thousand*1000-hundred*100-ten*10);if(ten_thousand!=0)printf("%d,%d,%d,%d,%d",ten_thousand,thousand,hundred,ten,indiv);elseif(thousand!=0)printf("%d,%d,%d,%d",thousand,hundred,ten,indiv);elseif(hundred!=0)printf("%d,%d,%d",hundred,ten,indiv);elseif(ten!=0)printf("%d,%d",ten,indiv);elseprintf("%d",indiv);printf("nThereversenumber:");switch(place){case5:printf("%d%d%d%d%d",indiv,ten,hundred,thousand,ten_thousand);break;case4:printf("%d%d%d%d",indiv,ten,hundred,thousand); break;case3:printf("%d%d%d",indiv,ten,hundred);break;case2:printf("%d%d",indiv,ten);break;case1:printf("%d",indiv);break;}}8、（1）#includevoidmain(){longi;floatbonus,bon1,bon2,bon3,bon4,bon6,bon10;bon1=100000*0.1;bon2=bon1+100000*0.075;bon4=bon2+200000*0.05; bon6=bon4+200000*0.03;bon10=bon6+400000*0.015;printf("pleaseinputbonus:");scanf("%ld",&i);if(i<=100000)bonus=i*0.1;elseif(i<=200000)bonus=bon1+(i-100000)*0.075;elseif(i<=400000)bonus=bon2+(i-200000)*0.05;elseif(i<=600000)bonus=bon4+(i-400000)*0.03;elseif(i<=1000000)bonus=bon6+(i-600000)*0.015;elsebonus=bon10+(i-1000000)*0.01;printf("bonus:%10.2fn",bonus);}（2）#includevoidmain(){ longi;floatbonus,bon1,bon2,bon4,bon6,bon10;intbranch;bon1=100000*0.1;bon2=bon1+100000*0.075;bon4=bon2+200000*0.05;bon6=bon4+200000*0.03;bon10=bon6+400000*0.015;printf("pleaseinputbonus:");scanf("%ld",&i);branch=i/100000;if(branch>10)branch=10;switch(branch){case0:bonus=i*0.1;break;case1:bonus=bon1+(i-100000)*0.075;break;case2:case3:bonus=bon2+(i-200000)*0.05;break;case4: case5:bonus=bon4+(i-400000)*0.03;break;case6:case7:case8:case9:bonus=bon6+(i-600000)*0.015;break;case10:bonus=bon10+(i-1000000)*0.01;}printf("bonusis%fn",bonus);}9、#includevoidmain(){inta,b,c,d,t;printf("pleaseinputfournumber:");scanf("%d,%d,%d,%d",&a,&b,&c,&d);printf("a=%d,b=%d,c=%d,d=%dn",a,b,c,d);if(a>b) {t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(a>d){t=a;a=d;d=t;}if(b>c){t=b;b=c;c=t;}if(b>d){t=b;b=d;d=t;}if(c>d){t=c;c=d;d=t;}printf("%d%d%d%dn",a,b,c,d);}10、#include#includevoidmain(){inth=10;float x1=2,y1=2,x2=-2,y2=2,x3=-2,y3=-2,x4=2,y4=-2,x,y,d1,d2,d3,d4;printf("pleaseinput(x,y):");scanf("%f,%f",&x,&y);d1=sqrt((x-x4)*(x-x4)+(y-y4)*(y-y4));d2=sqrt((x-x1)*(x-x1)+(y-y1)*(y-y1));d3=sqrt((x-x2)*(x-x2)+(y-y2)*(y-y2));d4=sqrt((x-x3)*(x-x3)+(y-y3)*(y-y3));if(d1>1&&d2>1&&d3>1&&d4>1)h=0;printf("height%dn",h);}第六章1、#includevoidmain(){intp,r,n,m,temp;printf("pleaseinputtwointeger:");scanf("%d,%d",&n,&m);if(nvoidmain(){charc;intletters=0,space=0,digit=0,other=0;printf("pleaseinputstring:n");while((c=getchar())!="n") {if((c>="a"&&c<="z")||(c>="A"&&c<="Z"))letters++;elseif(c=="")space++;elseif(c>="0"&&c<="9")digit++;elseother++;}printf("letters:%dnspace:%dndigit:%dnother:%dn",letters,space,digit,other);}3、#includevoidmain(){inta,n;inti=1,sn=0,tn=0;printf("pleaseinputa,n:");scanf("%d,%d",&a,&n);while(i<=n) {tn=tn+a;sn=sn+tn;a=a*10;++i;}printf("a+aa+aaa+^^^^^=%dn",sn);}4、#includevoidmain(){floats=0,t=1;intn;for(n=1;n<=20;n++){t=t*n;s=s+t;}printf("1!+2!+^^^^^^^^+20!=%en",s);} 5、#includevoidmain(){intn1=100,n2=50,n3=10;floatk;floats1=0,s2=0,s3=0;for(k=1;k<=n1;k++)s1=s1+k;for(k=1;k<=n2;k++)s2=s2+k*k;for(k=1;k<=n3;k++)s3=s3+1/k;printf("sum=%fn",s1+s2+s3);}6、#includevoidmain(){inti,j,k,n;printf("nnarcissusnumberare"); for(n=100;n<1000;n++){i=n/100;j=(n-100*i)/10;k=n-100*i-10*j;if(n==i*i*i+j*j*j+k*k*k)printf("%d",n);}}7、#includevoidmain(){intm,s,i;for(m=2;m<1000;m++){s=0;for(i=1;ivoidmain(){inti,t,n=20;floata=2,b=1,s=0;for(i=1;i<=n;i++){s=s+a/b;t=a;a=a+b;b=t;}printf("sum=%fn",s);}9、 #includevoidmain(){floatsn=100,hn=sn/2;intn;for(n=2;n<=10;n++){sn=sn+2*hn;hn=hn/2;}printf("tentharriveat%fmeter.n",sn);printf("tenth%fmeter.n",hn);}10、#includevoidmain(){intday,x1,x2;day=9;x2=1;while(day>0) {x1=(x2+1)*2;x2=x1;day--;}printf("total=%dn",x1);}11、#include#includevoidmain(){floata,x0,x1;printf("Enterapositivenumber:");scanf("%f",&a);x0=a/2;x1=(x0+a/x0)/2;do{x0=x1;x1=(x0+a/x0)/2;}while(fabs(x0-x1)>=1e-5); printf("Thesquarerootof%fis%fn",a,x1);}12、#include#includevoidmain(){floatx1,x0,f,f1;x1=1.5;do{x0=x1;f=((2*x0-4)*x0+3)*x0-6;f1=(6*x0-8)*x0+3;x1=x0-f/f1;}while(fabs(x1-x0)>=1e-5);printf("Therootofequationis%fn",x1);}13、#include #includevoidmain(){floatx0,x1,x2,fx0,fx1,fx2;do{printf("Enterx1andx2:");scanf("%f,%f",&x1,&x2);fx1=x1*((2*x1-4)*x1+3)-6;fx2=x2*((2*x2-4)*x2+3)-6;}while(fx1*fx2>0);do{x0=(x1+x2)/2;fx0=x0*((2*x0-4)*x0+3)-6;if((fx0*fx1)<0){x2=x0;fx2=fx0;}else{x1=x0;fx1=fx0;}}while(fabs(fx0)>=1e-5); printf("x=%fn",x0);}14、#includevoidmain(){inti,j,k;for(i=0;i<=3;i++){for(j=0;j<=2-i;j++)printf("");for(k=0;k<=2*i;k++)printf("*");printf("n");}for(i=0;i<=2;i++){for(j=0;j<=i;j++)printf("");for(k=0;k<=4-2*i;k++)printf("*");printf("n");} }15、#includevoidmain(){chari,j,k;/*i是A的对手；j是B的对手；k是C的对手*/for(i="X";i<="Z";i++)for(j="X";j<="Z";j++)for(k="X";k<"Z";k++)if(i!=j&&i!=k&&j!=k)if(i!="X"&&k!="X"&&k!="Z")printf("A--%ctB--%ctC--%cn",i,j,k);}'

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