学步园

#include <iostream><br /> using std::cout;<br /> using std::endl;</p> <p>int foo(double, double);</p> <p>int main()<br /> {<br /> int arr[5] = {1, 2, 3, 4, 5};</p> <p> // 指向数组元素的指针<br /> int* p = arr;<br /> for(int i=0; i<5; ++i) cout << p[i] << " ";<br /> cout << endl;</p> <p> // 指针数组<br /> int* q[3];<br /> q[0] = arr;<br /> for(int i=0; i<5; ++i) cout << q[0][i] << " ";<br /> cout << endl;</p> <p> // 数组指针<br /> int (*r) [5];<br /> r = &arr;<br /> for(int i=0; i<5; ++i) cout << (*r)[i] << " ";<br /> cout << endl;</p> <p> // 函数指针<br /> typedef int (*FuncPointer) (double, double);<br /> FuncPointer fp = foo;<br /> cout << "fp: " << fp(1, 3) << endl;<br /> cout << "fp: " << (*fp)(3, 1) << endl;</p> <p> system("PAUSE");<br /> }</p> <p>int foo(double a, double b)<br /> {<br /> if(a > b) return 1;<br /> else return 0;<br /> }