《C语言程序设计》苏小红课后习题答案高等教育出社.docx

1、C语言程序设计苏小红课后习题答案高等教育出社2.2 #includemain()float x=2.5,y=2.5,z=2.5;printf(x=%fn,x);printf(y=%fn,y);printf(z=%fn,z);3.1(1) #includemain()int a=12,b=3;float x=18.5,y=4.6;printf(%fn,(float)(a*b)/2);printf(%dn,(int)x%(int)y);3.1(2)#includemain() int x=32,y=81,p,q; p=x+; q=-y; printf(%d %dn,p,q); printf(%d

2、%dn,x,y);3.2 #includemain()int x,b0,b1,b2,s;printf(Inputx:);scanf(%d,&x);b2=x/100;b1=(x-b2*100)/10;/或(x%100)/10;或x/10%10;b0=x%10;s=b0*100+b1*10+b2;printf(s=%dn,s);3.3 #include#includemain()float rate=0.0225;float n,capital,deposit;printf(Input n,capital:);scanf(%f,%f,&n,&capital);deposit=capital*pow

3、(1+rate,n);printf(deposit=%fn,deposit);3.4 #include#includemain()float a, b, c;double x, y;printf(Input a, b, c:);scanf(%f %f %f, &a, &b, &c);x=(-b+sqrt(b*b-4*a*c)/(2*a);y=(-b-sqrt(b*b-4*a*c)/(2*a);printf(x=%f,y=%fn,x,y);习题44.1(1) #includemain()char c1=a,c2=b,c3=c;printf(a%cb%cc%cn,c1,c2,c3);4.1(2)

4、#includemain()int a=12,b=15;printf(a=%d%,b=%d%n,a,b);4.1(3) #includemain()int a,b;scanf(%2d%*2s%2d,&a,&b);printf(%d,%dn,a,b);4.2 #includemain()long a,b;float x,y;scanf(%d,%dn,&a,&b);scanf(%f,%fn,&x,&y);printf(a=%d,b=%dn,a,b);printf(x=%f,b=%fn,x,y);5.1 #includemain()float a;printf(Input a:);scanf(%f,

5、&a);if(a=0)a=a;printf(a=%fn,a);elsea=-a;printf(a=%fn,a);5.2 #includemain()int a;printf(Input a:);scanf(%d, &a);if(a%2=0)printf(a 是偶数);elseprintf(a 是奇数);5.3 #include#includemain()float a,b,c,s,area;printf(Input a, b, c:);scanf(%f %f %f, &a, &b, &c);if(a+bc&a+cb&b+ca)s=(a+b+c)/2;area=(float)sqrt(s*(s-

6、a)*(s-b)*(s-c);printf(area=%fn,area);elseprintf(不是三角形);5.4 #include#includemain()float a,b,c,x,y;printf(Inputa,b,c:);scanf(%f,%f,%f,&a,&b,&c);if(a=0)printf(该方程不是一元二次方程n);if(b*b-4*a*c0)x=(-b+sqrt(b*b-4*a*c)/(2*a);y=(-b-sqrt(b*b-4*a*c)/(2*a);printf(x=%f,y=%fn,x,y);else if(b*b-4*a*c=0)x=-b/(2*a);y=-b/(

7、2*a);printf(x=%f,y=%fn,x,y);elseprintf(该方程无实根n);5.5 #includemain()int year,flag;printf(Input a year:);scanf(%d,&year);if(year%4=0&year%400!=0|year%400=0)flag=1;elseflag=0;if(flag=1)printf(%d is a leap year !n,year);elseprintf(%d is not a leap year !n,year);5.6 #includemain()int year,flag;printf(Inpu

8、t a year:);scanf(%d,&year);flag=year%400=0|year%4=0&year%100!=0?1:0;if(flag=1&flag!=0)printf(%d is a leap year !n,year);elseprintf(%d is not a leap year !n,year);5.7 #includemain()char ch;printf(Inputch:);scanf(%c,&ch);if(ch=a&ch=A&ch=Z)ch=getchar();ch=ch+32;printf(%c,%dn,ch,ch);elseprintf(%c,ch);5.

9、8 #includemain()char ch;printf(Inputch:);scanf(%c,&ch);if(ch=48&ch=65&ch=97&ch=122)printf(ch 是小写字母n);else if(ch=32)printf(ch 是空格n);elseprintf(ch 是其他字符n);5.9 #includemain()int score,grade;printf(Input score:);scanf(%d,&score);grade=score/10;if(score100)printf(Input errorn);if(score=90&score=80&score=

10、70&score=60&score=0&score60)printf(%d- -En,score);5.10 #includemain()int year,month;printf(Input year,month:);scanf(%d,%d,&year,&month);if(month12|month=0)printf(error monthn);elseswitch(year,month)case 12:case 10:case 8:case 7:case 5:case 3:case 1:printf(31 天n);break;case 11:case 9:case 6:case 4:pr

11、intf(30 天n);break;case 2:if(year%4=0&year!=0|year%400=0)printf(29 天n);elseprintf(28 天n);break;default:printf(Input errorn);6.1(1) #includemain()int i,j,k;char space= ;for(i=1;i=4;i+)for(j=1;j=i;j+)printf(%c,space);for(k=1;k=6;k+)printf(*);printf(n);6.1(2) #includemain()int k=4,n;for(n=0;nk;n+)if(n%2

12、=0) continue;k-;printf(k=%dn,n=%dn,k,n);6.1(3) #includemain()int k=4,n;for(n=0;nk;n+)if(n%2=0) break;k-;printf(k=%d,n=%dn,k,n);6.2(1) #includemain()int i,sum=0;for(i=1;i=101;i+)sum=sum+i;printf(sum=%dn,sum);6.2(2) #includemain()long i;long term,sum=0;for(i=1;i=101;i=i+2)term=i*(i+1)*(i+2);sum=sum+te

13、rm;printf(sum=%ldn,sum);6.2(4) #include#includemain()int n=1;float term=1.0,sign=1,sum=0;while(term=1e-4)term=1.0/sign;sum=sum+term;sign=sign+n;n+;printf(sum=%fn,sum);6.2(5) #include#includemain()int n=1,count=1;float x;double sum,term;printf(Input x:);scanf(%f,&x);sum=x;term=x;doterm=-term*x*x/(n+1

14、)*(n+2);sum=sum+term;n=n+2;count+;while(fabs(term)=1e-5);printf(sin(x)=%f,count=%dn,sum,count);6.3 #includemain()int x=1,find=0;while(!find)if(x%2=1&x%3=2&x%5=4&x%6=5&x%7=0)printf(x=%dn,x);find=1;x+;/* int x,find=0;for (x=1;!find;x+)if(x%2=1&x%3=2&x%5=4&x%6=5&x%7=0)printf(x=%dn,x);find=1;*/6.4 #incl

15、udemain()int i,n;long p=1,m=1;printf(Input n:);scanf(%d,&n);for(i=1;i=n;i+)p=i*i;m=i*i*i;printf(p=%d,m=%dn,i,p,i,m);6.5 #includemain()float c,f;for(c=-40;c=110;c=c+10)f=9/5*c+32;printf(f=%fn,f);6.6 #include#includemain()int n;double c=0.01875,x;dox=x*pow(1+c,12)-1000;n+;while(x0);printf(x=%dn,x);6.7

16、 #includemain()int n=0;float a=100.0,c;printf(Inputc:);scanf(%f,&c);doa=a*(1+c);n+;while(a=200);printf(n=%dn,n);6.8 #include#includemain()int n=1,count=1;double sum=1,term=1;while(fabs(term)=1e-5)term=pow(-1,count)*(1.0/(n+2);sum=sum+term;n=n+2;count+;sum=4*sum;printf( sum=%f,count=%dn,sum,count);6.

17、9 #include#includemain()int n=1,count=1;double sum=1,term=1;while(fabs(term)=1e-5)term=term*(1.0/n);sum=sum+term;n+;count+;printf(sum=%f,count=%dn,sum,count);6.10 #include#includemain()int x;for(x=100;x=999;x+)if(x=pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3)printf(x=%dn,x);6.11 #includemain()int i=0,n;l

18、ong sum=0,term=1;printf(Inputn:);scanf(%d,&n);doi+;term=term*i;sum=sum+term;while(sumn);printf(%dn,i-1);6.12 #includemain()int i,n,m,count=0,sum=0;printf(Input n:);scanf(%d,&n);for(i=1;i0)sum=sum+m;count+;elsebreak;printf(sum=%d,count=%dn,sum,count);6.13 #includemain()int i,n,m,count=0,sum=0;printf(

19、Inputn:);scanf(%d,&n);for(i=1;i0|m0)sum=sum+m;count+;elsebreak;printf(sum=%d,count=%dn,sum,count);6.14 #includemain()int x,y,z;for(x=0;x=17;x+)for(y=0;y=25;y+)3*x+2*y+z=50;z=30-x-y;if( 3*x+2*y+z=50&x+y+z=30)printf(x=%d,y=%d,z=%dn,x,y,z);6.15 #includemain()int x,y;for(x=0;x=98;x+)y=98-x;2*x+4*y=386;i

20、f(x+y=98&2*x+4*y=386)printf(x=%d,y=%dn,x,y);6.16 #includemain()int x,y,z;for(x=0;x=20;x+)for(y=0;y=33;y+)3*y+5*x+z/3.0=100;z=100-x-y;if (5*x+3*y+z/3.0=100&z+x+y=100)printf(x=%d,y=%d,z=%dn,x,y,z);6.17 #includemain()int x,y,z;for(x=1;x=9;x+)for(y=1;y0)printf(x=%d,y=%d,z=%dn,x,y,z);7.1 #includeint Squa

21、re(int i)return i*i;int main()int i=0;i=Square(i);for( ;i3;i+)static int i=1;i+=Square(i);printf(%d,i);printf(%dn,i);return 0;7.2 #includeint hour,minute,second;void update()second+;if(second=60)second=0;minute+;if(minute=60)minute=0;hour+;if(hour=24)hour=0;void display()printf(%d,%d,%dn,hour,minute

22、,second);void delay()int t;int main()int i;void updaye(),display(),delay();for(i=0;i1000000;i+)update();display();delay();return 0;7.3 #includeint GetMax(int a,int b);int main()int x,y,max;printf(Inputx,y:);scanf(%d,%d,&x,&y);max=GetMax(x,y);printf(max=%dn,max);return 0;int GetMax(int m,int n)if(m=n)return m;elsereturn n;7.4 #includeint LCM(int n,int m);int main()int a,b;printf(Inputa,b:);scanf(%d,%d,&a,&b);printf(%dn,LCM(a,b);return 0;