1
在c++中是不允许数组作为函数的返回值的
int [] someFunction( ); //ILLEGAL
要想实现函数返回一个数组，那返回对应数组里面类型的指针
you must return a pointer to the array base type and have the pointer point to the array. So, the function declaration would be as follows:
int* someFunction( ); //Legalint* doubler( int a[], int size)
{ int* temp = new int[size];for ( int i =0; i < size; i++) temp[i] = 2*a[i]; return temp; }调用
int a[] = {1, 2, 3, 4, 5};
int* b;b = doubler(a, 5);delete[] b
2 初始化数组的时候必须指定大小
test.cpp:425:23: error: expression in new-declarator must have integral or enumeration type
char *p =new char[num1+leng2];