第6章 数组、指针与字符串

 

 

注意new的使用

lab6_2.cpp

#include <iostream>
using namespace std;

void swap(int &a, int &b)
{
    /********** Begin **********/
    int tmp = a;
    a = b;
    b = tmp;
    /********** End **********/
}

int main()
{
    /********** Begin **********/
    cout << "输入9个整数作为矩阵元素值" << endl;
    int **a;
    a = new int *[3];
    for (int i = 0; i < 3; ++i)
        a[i] = new int[3];
    cout << "初始矩阵：" << endl;
    for (int i = 0; i < 3; ++i)
    {
        for (int j = 0; j < 3; ++j)
            cin >> a[i][j], cout << a[i][j] << ' ';
        cout << endl;
    }
    for (int i = 0; i < 3; ++i)
        for (int j = 0; j < i; ++j)
            swap(a[i][j], a[j][i]);
    cout << "转置矩阵：" << endl;
    for (int i = 0; i < 3; ++i)
    {
        for (int j = 0; j < 3; ++j)
            cout << a[i][j] << ' ';
        cout << endl;
    }
    /********** End **********/
    return 0;
}

lab6_3.cpp

#include <iostream>
#include <cstring>
using namespace std;

char *link(char *a, char *b)
{
    /********** Begin **********/
    int lena = strlen(a), lenb = strlen(b), len = lena + lenb;
    static char res[256];
    for (int i = 0; i < lena; ++i)
        res[i] = a[i];
    for (int i = 0; i < lenb; ++i)
        res[i + lena] = b[i];
    return res;
    /********** End **********/
}

int main()
{
    char a[128], b[128];

    cin >> a >> b;

    cout << link(a, b) << endl;
    return 0;
}