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C++Primer（第六章課後習題）（程序題源代碼）

編輯：關於C++

6.4

#include
#include
#include
#include
#include
#include

using namespace std;
int fact(int val)
{
    if (val < 0)
        return -1;
    int ret = 1;
    for (int i = 1; i != val + 1; ++i)
        ret *= i;
    return ret;
}

int main()
{
    int num;
    cout << "請輸入一個整數:";
    cin >> num;
    cout << num << "的階乘是:" << fact(num) << endl;
    return 0;
}

6.5

#include
#include
#include
#include
#include
#include

using namespace std;
double myABS(double val)
{
    if (val < 0)
        return val*-1;
    else
        return val;
}

double myABS2(double val)
{
    return abs(val);
}

int main()
{
    double num;
    cout << "請輸入一個數:";
    cin >> num;
    cout << num << "的絕對值是:" << myABS(num) << endl;
    cout << num << "的絕對值是:" << myABS2(num) << endl;
    return 0;
}

6.6

#include
#include
#include
#include
#include
#include

using namespace std;

double myADD(double val1, double val2)
{
    double result = val1 + val2;
    static unsigned iCnt = 0;
    ++iCnt;
    cout << "該函數已經累計執行了" << iCnt << "次" << endl;
    return result;
}
int main()
{
    double num1, num2;
    cout << "請輸入兩個整數:";
    while (cin >> num1 >> num2)
    {
        cout << num1 << "與" << num2 << "的求和結果是:"
            << myADD(num1, num2) << endl;
    }
    return 0;
}

6.7

這裡寫代碼片

6.8

#ifndef CHAPTER6_H_INCLUDED
#define CHAPTER6_H_INCLUDED

int fact(int);
double myABS(double);
#endif

6.9

#include"Chapter6.h"
#include
using namespace std;
double myABS(double val)
{
    if (val < 0)
        return val*-1;
    else
        return val;
}

double myABS2(double val)
{
    return abs(val);
}
int fact(int val)
{
    if (val < 0)
        return -1;
    int ret = 1;
    for (int i = 1; i != val + 1; ++i)
        ret *= i;
    return ret;
}


#include
#include
#include
#include
#include
#include
#include"Chapter6.h"

using namespace std;

int main()
{
    int num;
    cout << "請輸入一個整數:";
    cin >> num;
    cout << num << "的階乘是：" << fact(num) << endl;
    return 0;
}

6.10

#include
#include
#include
#include
#include
#include

using namespace std;

void mySWAP(int *p, int *q)
{
    int tmp = *p;
    *p = *q;
    *q = tmp;
}

int main()
{
    int a = 5, b = 10;
    int *r = &a, *s = &b;
    cout << "交換前:a=" << a << ",b=" << b << endl;
    mySWAP(r, s);
    cout << "交換後:a=" << a << ",b=" << b << endl;
    return 0;
}

6.11

#include
#include
#include
#include
#include
#include

using namespace std;

void reset(int &i)
{
    i = 0;
}

int main()
{
    int num = 10;
    cout << "重置前:num=" << num << endl;
    reset(num);
    cout << "重置後:num=" << num << endl;
    return 0;
}

6.12

#include
#include
#include
#include
#include
#include

using namespace std;

void mySWAP(int &i, int &j)
{
    int tmp = i;
    i = j;
    j = tmp;
}

int main()
{
    int a = 5, b = 10;
    int *r = &a, *s = &b;
    cout << "交換前:a=" << a << ",b=" << b << endl;
    mySWAP(a,b);
    cout << "交換後:a=" << a << ",b=" << b << endl;
    return 0;
}

6.13

#include
#include
#include
#include
#include
#include

using namespace std;

void a(int);
void b(int&);

int main()
{
    int s = 0, t = 10;
    a(s);
    cout << s << endl;
    b(t);
    cout << t << endl;
    return 0;
}

void a(int i)
{
    ++i;
    cout << i << endl;
}

void b(int& j)
{
    ++j;
    cout << j << endl;
}

6.17

#include
#include
#include
#include
#include
#include

using namespace std;

bool HasUpper(const string& str)
{
    for (auto c : str)
    {
        if (isupper(c))
            return true;
        return false;
    }
}

void ChangeToLower(string& str)
{
    for (auto &c : str)
    {
        c = tolower(c);
    }
}

int main()
{
    cout << "請輸入一個字符串：" << endl;
    string str;
    cin >> str;
    if (HasUpper(str))
    {
        ChangeToLower(str);
        cout << "轉換後的字符串是:" << str << endl;
    }
    else
    {
        cout << "該字符串不含大寫字母，無須轉換" << endl;
    }
    return 0;
}

6.21

#include
#include
#include
#include
#include
#include

using namespace std;

int myCompare(const int val, const int *p)
{
    return (val > *p) ? val : *p;
}

int main()
{
    srand((unsigned)time(NULL));
    int a[10];
    for (auto &i : a)
        i = rand() % 100;
    cout << "請輸入一個數:";
    int j;
    cin >> j;
    cout << "您輸入的數與數組首元素中交大的是:" << myCompare(j, a) << endl;
    cout << "數組的全部元素是:" << endl;
    for (auto i : a)
        cout << i << " ";
    cout << endl;
    return 0;
}

6.22

#include
#include
#include
#include
#include
#include

using namespace std;

void SwapPointer1(int *p, int *q)
{
    int *temp = p;
    p = q;
    q = temp;
}

void SwapPointer2(int *p, int *q)
{
    int temp = *p;
    *p = *q;
    *q = temp;
}

void SwapPointer3(int *&p, int *&q)
{
    int *temp = p;
    p = q;
    q = temp;
}

int main()
{
    int a = 5, b = 10;
    int *p = &a, *q = &b;
    cout << "交換前：" << endl;
    cout << "p的值是：" << p << ",q的值是：" << q << endl;
    cout << "p所指的值是：" << *p << ",q所指的值是：" << *q << endl;
    SwapPointer1(p, q);
    cout << "交換後：" << endl;
    cout << "p的值是：" << p << ",q的值是：" << q << endl;
    cout << "p所指的值是：" << *p << ",q所指的值是：" << *q << endl;
    a = 5, b = 10;
    cout << "交換前：" << endl;
    cout << "p的值是：" << p << ",q的值是：" << q << endl;
    cout << "p所指的值是：" << *p << ",q所指的值是：" << *q << endl;
    SwapPointer2(p, q);
    cout << "交換後：" << endl;
    cout << "p的值是：" << p << ",q的值是：" << q << endl;
    cout << "p所指的值是：" << *p << ",q所指的值是：" << *q << endl;
    a = 5, b = 10;
    cout << "交換前：" << endl;
    cout << "p的值是：" << p << ",q的值是：" << q << endl;
    cout << "p所指的值是：" << *p << ",q所指的值是：" << *q << endl;
    SwapPointer3(p, q);
    cout << "交換後：" << endl;
    cout << "p的值是：" << p << ",q的值是：" << q << endl;
    cout << "p所指的值是：" << *p << ",q所指的值是：" << *q << endl;
    return 0;
}

6.23

#include
#include
#include
#include
#include
#include

using namespace std;

void print1(const int *p)
{
    cout << *p << endl;
}

void print2(const int *p, const int sz)
{
    int i = 0;
    while (i != sz)
    {
        cout << *p++ << endl;
        ++i;
    }
}

void print3(const int *b, const int *e)
{
    for (auto q = b; q != e; ++q)
        cout << *q << endl;
}

int main()
{
    int i = 0;
    int j[2] = { 0, 1 };
    print1(&i);
    print1(j);
    print2(&i, 1);
    print2(j, sizeof(j) / sizeof(int));
    auto a = begin(j);
    auto b = end(j);
    print3(a, b);
    return 0;
}

6.25

#include
#include
#include
#include
#include
#include

using namespace std;

int main(int argc, char **argv)
{
    string str;
    for (int i = 0; i != argc; i++)
        str += argv[i];
    cout << str << endl;
    return 0;
}

6.26

#include
#include
#include
#include
#include
#include

using namespace std;

int main(int argc, char **argv)
{
    for (int i = 0; i != argc; i++)
    {
        cout << "argc[" << i << "]:" << argv[i] << endl;
    }
    return 0;
}

6.27

#include
#include
#include
#include
#include
#include

using namespace std;

int iCount(initializer_list il)
{
    int count = 0;
    for (auto val : il)
        count += val;
    return count;
}

int main()
{
    cout << "1,6,9的和是：" << iCount({ 1, 6, 9 }) << endl;
    cout << "4,5,9,18的和是：" << iCount({ 4, 5, 9, 18 }) << endl;
    cout << "10,10,10,10,10,10,10,10,10的和是："
        << iCount({ 10, 10, 10, 10, 10, 10, 10, 10, 10 }) << endl;
    return 0;
}

#include
#include
#include
#include
#include
#include

using namespace std;

void print(vector v, int index)
{
    unsigned sz = v.size();
    if (!v.empty() && index < sz)
    {
        cout << v[index] << endl;
        print(v, index + 1);
    }
}
int main()
{
    vector v = { 1, 3, 5, 7, 9, 11, 13, 15 };
    print(v, 0);
    return 0;
}

6.33

#pragma warning(disable:4996)
#include
#include
#include
#include
#include
#include
#include
#include
#include


using namespace std;

void  print(vector vInt, unsigned index)
{
    unsigned sz = vInt.size();
    if (!vInt.empty() && index < sz)
    {
        cout << vInt[index] << endl;
        print(vInt, index + 1);
    }
}

int main()
{
    vector v = { 1, 3, 5, 7, 9, 11, 13, 15 };
    print(v, 0);
    return 0;
}

6.38

#pragma warning(disable:4996)
#include
#include
#include
#include
#include
#include
#include
#include
#include


using namespace std;

string make_plural(size_t ctr, const string &word, const string &ending = "s")
{
    return (ctr > 1) ? word + ending : word;
}

int main()
{
    cout << "success的單數形式：" << make_plural(1, "success", "es") << endl;
    cout << "success的復數形式：" << make_plural(2, "success", "es") << endl;
    cout << "failure的單數形式：" << make_plural(1, "failure") << endl;
    cout << "failure的單數形式：" << make_plural(2, "failure") << endl;
    return 0;
}

6.47

#pragma warning(disable:4996)
#include
#include
#include
#include
#include
#include
#include
#include
#include


using namespace std;

void  print(vector vInt, unsigned index)
{
    unsigned sz = vInt.size();
#ifndef NDEBUG
    cout << "vector對象的大小：" << sz << endl;
#endif
    if (!vInt.empty() && index < sz)
    {
        cout << vInt[index] << endl;
        print(vInt, index + 1);
    }
}

int main()
{
    vector v = { 1, 3, 5, 7, 9, 11, 13, 15 };
    print(v, 0);
    return 0;
}

6.51

#pragma warning(disable:4996)
#include
#include
#include
#include
#include
#include
#include
#include
#include


using namespace std;

void f()
{
    cout << "該函數無須參數" << endl;
}

void f(int)
{
    cout << "該函數有一個整型參數" << endl;
}
void f(int, int)
{
    cout << "該函數有兩個整型參數" << endl;
}
void f(double a, double b = 3.14)
{
    cout << "該函數有兩個雙精度浮點型參數" << endl;
}
int main()
{
    //二義性f(2.56, 42);
    f(42);
    f(42, 0);
    f(2.56, 3.14);
}

6.55

#pragma warning(disable:4996)
#include
#include
#include
#include
#include
#include
#include
#include
#include


using namespace std;

int func1(int a, int b)
{
    return a + b;
}

int func2(int a, int b)
{
    return a - b;
}

int func3(int a, int b)
{
    return a*b;
}

int func4(int a, int b)
{
    return a / b;
}

int main()
{
    decltype(func1)* p1 = func1, *p2 = func2, *p3 = func3, *p4 = func4;
    vectorvF = { p1, p2, p3, p4 };
    return 0;
}

6.56

#pragma warning(disable:4996)
#include
#include
#include
#include
#include
#include
#include
#include
#include


using namespace std;

int func1(int a, int b)
{
    return a + b;
}

int func2(int a, int b)
{
    return a - b;
}

int func3(int a, int b)
{
    return a*b;
}

int func4(int a, int b)
{
    return a / b;
}
void Compute(int a, int b, int(*p)(int, int))
{
    cout << p(a, b) << endl;
}
int main()
{
    int i = 5, j = 10;
    decltype(func1)* p1 = func1, *p2 = func2, *p3 = func3, *p4 = func4;
    vectorvF = { p1, p2, p3, p4 };
    for (auto p : vF)
    {
        Compute(i, j, p);
    }
    return 0;
}