《C程序设计+》完整课后习题答案(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、
#define PI 3.1415926
#includestdio.h
void main()
{
float h,r,l,s,sq,vq,vz;
printf(please input r,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=%6.2f\n,l);
printf(s=%6.2f\n,s);
printf(sq=%6.2f\n,sq);
printf(vq=%6.2f\n,vq);
printf(vz=%6.2f\n,vz);
}
9、
#includestdio.h
void main()
{
float c,f;
printf(please input f:);
scanf(%f,f);
c=(5.0/9.0)*(f-32);
printf(c:%6.2f\n,c);
}
第五章
5、
#includestdio.h
void main()
{
int x,y;
printf(please input x:);
scanf(%d,x);
if(x1)
{y=x;
printf(x=%d,y=x=%d\n,x,y);}
else if(x10)
{y=2*x-1;
printf(x=%d,y=2*x-1=%d\n,x,y);}
else
{y=3*x-11;
printf(x=%d,y=3*x-11=%d\n,x,y);}
}
6、
#includestdio.h
void main()
{
float score;
char grade;
printf(please input the student score:);
scanf(%f,score);
while((score100)||(score0))
{printf(error,please input again!\n);
printf(please input the student score:);
scanf(%f,score);
}
switch((int)(score/10))
{
case 10:
case 9:grade=A;break;
case 8:grade=B;break;
case 7:grade=C;break;
case 6:grade=D;break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:grade=E;
}
printf(score is %f,grade is %c\n,score,grade);
}
7、
#includestdio.h
#includemath.h
void main()
{
long int num;
int indiv,ten,hundred,thousand,ten_thousand,place;
printf(please input an integer(0-99999):);
scanf(%ld,num);
if(num9999) place=5;
else if(num999) place=4;
else if(num99) place=3;
else if(num9) place=2;
else place=1;
printf(Total digits:%d\n,place);
printf(For each number:);
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);
else if(thousand!=0) printf(%d,%d,%d,%d,thousand,hundred,ten,indiv);
else if(hundr
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