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#include <iostream> using namespace std; int main () { int*ptr = NULL; cout << "The value of ptr is " << ptr ;

C++使用指针

#include <iostream> using namespace std; int main () { intvar = 20;// actual variable declaration.

// #include <iostream> using namespace std; int main () { intvar1; char var2[10]; cout << "Address of var1 variable: ";

#include <iostream> #include <string> using namespace std; int main () { string str1 = "Hello";

C++字符串函数

#include <iostream> #include <cstring> using namespace std; int main () { char str1[10] = "Hello";

#include <iostream> using namespace std; int main () { char greeting[6] = {'H', 'e', 'l', 'l', 'o', '\\0'};

C++从函数返回数组

#include <iostream> #include <ctime> using namespace std; // function to generate and retrun random numbers.

C++将数组传递给函数

#include <iostream> using namespace std; double getAverage(int arr[], int size) { int i, sum = 0; double avg;

C++指向数组的指针

#include <iostream> using namespace std; int main () { // an array with 5 elements. double balance[5] = {1000.0, 2.0, 3.4, 17.0, 50.0};

C++访问二维数组

#include <iostream> using namespace std; int main () { // an array with 5 rows and 2 columns. int a[5][2] = { {0,0}, {1,2}, {2,4}, {3,6},{4,8}};

C++访问数组元素

#include <iostream> using namespace std; #include <iomanip> using std::setw; int main () { int n[ 10 ];// n is an array of 10 integers

#include <iostream> #include <ctime> #include <cstdlib> using namespace std; int main () {

C++数学运算

#include <iostream> #include <cmath> using namespace std; int main () { // number definition:

C++定义数字

#include <iostream> using namespace std; int main () { // number definition: shorts; inti; longl; floatf;

C++通过引用调用

#include <iostream> using namespace std; // function definition to swap the values. void swap(int &x, int &y) {

C++通过指针调用

#include <iostream> using namespace std; // function definition to swap the values. void swap(int *x, int *y) {

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