c++谭浩强第三版csdn_C++程序设计(第二版)谭浩强----程序题课后习题答案第三章...

2.

#define _USE_MATH_DEFINES#include#include#include

using namespacestd;intmain()

{floatr, h, l, S, S1, V, V1;

cin>> r >>h;

l= 2 * M_PI *r;

S= M_PI * r *r;

S1= 4 * M_PI * r *r;

V= 4 / 3 * M_PI * r * r *r;

V1= S *h;

cout<< setiosflags(ios::fixed) << setprecision(2);

cout<< "圆周长 l =" << l << '\t' << "圆面积 S =" << S <

cout<< "圆球表面积 S1 =" << S1 << '\t' << "圆球体积 V =" << V <

cout<< "圆柱体积 V1 =" << V1 <

}

结果：

3.

#include #include

using namespacestd;intmain()

{floatF, c;

cout<< "华氏温度 F =";

cin>>F;

cout<< setiosflags(ios::fixed) << setprecision(2);

c= (5.0 / 9.0) * (F - 32);

cout<< "摄氏温度c =" << c <

}

结果：

4.

c1,c2定义为字符型

#include

using namespacestd;intmain()

{charc1, c2;

cout<< "请输入两个字符";

c1=getchar();

c2=getchar();

cout<< "putchar 输出结果";

putchar(c1);

putchar('\t');

putchar(c2);

putchar('\n');

cout<< "cout输出结果";

cout<< c1 << '\t' << c2 <

}

结果：

c1,c2定义为整形

#include

using namespacestd;intmain()

{intc1, c2;

cout<< "请输入两个字符";

c1=getchar();

c2=getchar();

cout<< "putchar 输出结果";

putchar(c1);

putchar('\t');

putchar(c2);

putchar('\n');

cout<< "cout输出结果";

cout<< c1 << '\t' << c2 <

}

结果：

定义为整形即可输出ASCII码。

8.

0

1

1

0

1

9.

#include

using namespacestd;intmain()

{int compare(int x, int y, intz);inta, b, c, temp, max;

cout<< "输入三个整数a b c" <

cin>> a >> b >>c;//第一种方法

/*if ((a > b) && (a > c))

cout << "最大的数为a = " << a << endl;

else if((b>a)&&(b>c))

cout << "最大的数为b = " << b << endl;

else

cout << "最大的数为c = " << c << endl;*/

//第二种方法

/*if(a

if(b

cout << "最大的数为c = " << c << endl;

else

cout << "最大的数为b = " << b << endl;

else

if(a

cout << "最大的数为c = " << c << endl;

else

cout << "最大的数为a = " << a << endl;*/

//第三种方法

/*temp = (a > b) ? a : b;

max = (temp > c) ? temp : c;

cout << "最大的数为 " << max << endl;*/max=compare(a, b, c);

cout<< "最大的数为" << max <

}int compare(int x, int y, intz)

{inttemp, max;

temp= (x > y) ?x : y;

max= (temp > z) ?temp : z;returnmax;

}

结果：

10.

#include

using namespacestd;intmain()

{intx, y;

cout<< "输入 x =";

cin>>x;if (x < 1)

y=x;else

if (x >= 1 && x < 10)

y= 2 * x - 1;elsey= 3 * x - 11;

cout<< "输出 y =" << y <

结果：

11.

#include

using namespacestd;intmain()

{intgrade;while (1)

{

cout<< "输入学生成绩grade =";

cin>>grade;if (grade < 0 || grade > 100)

cout<< "成绩输入错误,请重新输入！" <

switch ((int)grade / 10)

{case 10: cout << grade << "分成绩等级为A" << endl; break;case 9: cout << grade << "分成绩等级为A" << endl; break;case 8: cout << grade << "分成绩等级为B" << endl; break;case 7: cout << grade << "分成绩等级为C" << endl; break;case 6: cout << grade << "分成绩等级为D" << endl; break;default: cout << grade << "分成绩等级为E" << endl; break;

}

}return 0;

}

结果：

12.

#include

using namespacestd;intmain()

{long inta;

cout<< "输入正整数 a =";while (1)

{

cin>>a;if (a > 99999)

{

cout<< "输入错误,请重新输入！" <

}else if (a / 10000 > 0)

cout<< "a 为5位数" << a / 10000 + (a % 10000) / 1000 * 10 + (a % 1000) / 100 * 100 + (a % 100) / 10 * 1000 + (a % 10) * 10000 < 0)

cout<< "a 为4位数" << a / 1000 + (a % 1000) / 100 * 10 + (a % 100) / 10 * 100 + (a % 10) * 1000 < 0)

cout<< "a 为3位数" << a / 100 + (a % 100) / 10 * 10 + (a % 10) * 100 < 0)

cout<< "a 为2位数" << a / 10 + (a % 10) * 10 <

}return 0;

}

结果：

13.

#include

using namespacestd;intmain()

{floati;intc;while (1)

{/*cout << "输入当月利润为 i = ";

cin >> i;

if (i <= 10)

cout << "应发奖金为 " << i*0.1 << "万元" << endl;

else if (i <= 20 && i >= 10)

cout << "应发奖金为 " << 10 * 0.1 + (i - 10)*0.075 << "万元" << endl;

else if (i <= 40 && i >= 20)

cout << "应发奖金为 " << 10 * 0.1 + 10 * 0.075 + (i - 20)*0.05 << "万元" << endl;

else if (i <= 60 && i >= 40)

cout << "应发奖金为 " << 10 * 0.1 + 10 * 0.075 + 20 * 0.05 + (i - 40)*0.03 << "万元" << endl;

else if (i <= 100 && i >= 60)

cout << "应发奖金为 " << 10 * 0.1 + 10 * 0.075 + 20 * 0.05 + 20 * 0.03 + (i - 60)*0.015 << "万元" << endl;

else

cout << "应发奖金为 " << 10 * 0.1 + 10 * 0.075 + 20 * 0.05 + 20 * 0.03 + 40 * 0.015 + (i - 100)*0.01 << "万元" << endl;*/cout<< "输入当月利润为 i =";

cin>>i;

c= i / 10;if (c > 10) c = 10;switch(c)

{case 0: cout << "应发奖金为" << i*0.1 << "万元" << endl; break;case 1: cout << "应发奖金为" << 10 * 0.1 + (i - 10)*0.075 << "万元" << endl; break;case 2:case 3: cout << "应发奖金为" << 10 * 0.1 + 10 * 0.075 + (i - 20)*0.05 << "万元" << endl; break;case 4:case 5: cout << "应发奖金为" << 10 * 0.1 + 10 * 0.075 + 20 * 0.05 + (i - 40)*0.03 << "万元" << endl; break;case 6:case 7:case 8:case 9: cout << "应发奖金为" << 10 * 0.1 + 10 * 0.075 + 20 * 0.05 + 20 * 0.03 + (i - 60)*0.015 << "万元" << endl; break;case 10: cout << "应发奖金为" << 10 * 0.1 + 10 * 0.075 + 20 * 0.05 + 20 * 0.03 + 40 * 0.015 + (i - 100)*0.01 << "万元" << endl; break;

}

}return 0;

结果：

14.

#include

using namespacestd;intmain()

{void sort(int m, int j, int k, intl);inta, b, c, d;

cout<< "请输入四个整数";

cin>> a >> b >> c >>d;

sort(a, b, c, d);return 0;

}void sort(int m, int j, int k, intl)

{inttemp;if (m > j) { temp = m; m = j; j =temp; }if (m > k) { temp = m; m = k; k =temp; }if (m > l) { temp = m; m = l; l =temp; }if (j > k) { temp = j; j = k; k =temp; }if (j > l) { temp = j; j = l; l =temp; }if (k > l) { temp = k; k = l; l =temp; }

cout<< "从小到大顺序输出为：" << m << '\t' << j << '\t' << k << '\t' << l << '\t' <

}

结果：

15.

#include

using namespacestd;intmain()

{intm, n, temp, p;while (1)

{

temp= 1;

cout<< "请输入两个正整数：";

cin>> m >>n;

p= m *n;while (temp != 0)

{if (m >n)

{

temp= m %n;

m= n; n =temp;if (temp == 0)

{

cout<< "m 和 n 的最大公约数为：" << m <

cout<< "m 和 n 的最小公倍数为：" << p / m <

}

}else{

temp= n %m;

n= m; m =temp;if (temp == 0)

{

cout<< "m 和 n 的最大公约数为：" << n <

cout<< "m 和 n 的最小公倍数为：" << p / n <

}

}

}

}return 0;

}

结果：

16.

#include

using namespacestd;intmain()

{charc;int l = 0, s = 0, d = 0, o = 0;

cout<< "请输入一行字符" <

{while ((c = getchar()) != '\n')

{if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z')

l++;else if (c == ' ')

s++;else if (c >= '0' && c <= '9')

d++;elseo++;

}

cout<< "这一行字符中" << "英文字母" << l << "个" <

cout<< "这一行字符中" << "空格" << s << "个" <

cout<< "这一行字符中" << "数字" << d << "个" <

cout<< "这一行字符中" << "其他字符" << o << "个" <

l= 0, s = 0, d = 0, o = 0;

}return 0;

}

结果：

17.

#include

using namespacestd;intmain()

{int a, Sn = 0, n, i = 1, temp = 0;

cout<< "输入 a 的值:";

cin>>a;

cout<< "输入 n 的值:";

cin>>n;while (i <=n)

{

temp= temp +a;

Sn= Sn +temp;

a= a * 10;

i++;

}

cout<< "Sn =" << Sn <

}

结果：

18.

#include

using namespacestd;intmain()

{int n = 1, S = 0, temp = 1;while (n <= 20)

{

temp= temp*n;

S= S +temp;

n++;

}

cout<< S <

}

结果：

19.

#include

using namespacestd;intmain()

{inta, b, i, j, k;for (a = 100; a < 1000; a++)

{

i= a / 100;

j= (a % 100) / 10;

k= a % 10;

b= i*i*i + j*j*j + k*k*k;if (a ==b)

cout<< a << "是水仙花数" <

}return 0;

}

结果：

20.

#include

using namespacestd;intmain()

{intm, n, i;for (m = 2; m<1000; m++)

{

n= 0;for (i = 1; i

{

cout<< m << ",its factors are:";for (i = 1; i

cout<

}

}return 0;

}

结果：

21.

#include

using namespacestd;intmain()

{int i, t, n = 20;double a = 2, b = 1, s = 0;for (i = 1; i <= n; i++)

{

s= s + a /b;

t=a;

a= a + b; //将前一项分子与分母之和作为下一项的分子

b = t; //将前一项的分子作为下一项的分母

}

cout<< "sum=" << s <

}

结果：

22.

#include

using namespacestd;intmain()

{int n = 1, i;for (i = 1; i < 10; i++)

{

n= (n + 1) * 2;

}

cout<< "桃子总数" << n <

}

结果：

23.

#include #include

using namespacestd;intmain()

{floata, x0, x1;

cout<< "enter a positive number:";

cin>>a;

x0= sqrt(double(a));

x1= (x0 + a / x0) / 2;do{

x0=x1;

x1= (x0 + a / x0) / 2;

}while (fabs(x0 - x1) >= 1e-5);

cout<< "The square root of" << a << "is" << x1 <

}

结果：

24.

#include

using namespacestd;intmain()

{inti, k;for (i = 0; i <= 3; i++) //输出上面4行*号

{for (k = 0; k <= 2 * i; k++)

cout<< "*"; //输出*号

cout << endl; //输出完一行*号后换行

}for (i = 0; i <= 2; i++) //输出下面3行*号

{for (k = 0; k <= 4 - 2 * i; k++)

cout<< "*"; //输出*号

cout << endl; //输出完一行*号后换行

}return 0;

}

结果：

25.

#include

using namespacestd;intmain()

{char i, 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++)if (i !=j)for (k = 'X'; k <= 'Z'; k++)if (i != k && j !=k)if (i != 'X' && k != 'X' && k != 'Z')

cout<< "A--" << i << "B--" << j << "C--" << k <

}

结果：