1.使用标准库规范

 

int sum_array( const int *beg, int *en ){	int sum = 0;	while ( beg != en )	{		sum += *beg++;	}	return sum;}int main(){	int a[] = { 1,1,2,3,4,5,6,7,8,9 };	cout << sum_array( a, a + sizeof(a)/sizeof(*a) );	return 0;}

2.显式传递表示数组大小形参

int sum_array( const int *a, int size ){	int sum = 0;	for ( int i = 0; i < size; i++ )	{		sum += *(a + i);	}	return sum;}int main(){	int a[] = { 1,1,2,3,4,5,6,7,8,9 };	cout << sum_array( a, sizeof(a)/sizeof(*a) );	return 0;}

3.数组大小int sum_array( const int a[], int size ){	int sum = 0;	for ( int i = 0; i < size; i++ )	{		sum += *(a + i);	}	return sum;}int main(){	int a[] = { 1,1,2,3,4,5,6,7,8,9 };	cout << sum_array( a, sizeof(a)/sizeof(*a) );	return 0;}