[C ++] 2D array parameter transfer and all initialization to 0

a is a two-dimensional array

Parameter passing

No.	Formal parameter	Arguments	Formal parameter type
1	a[][size]	a	Array
2	(*a)[size]	a	Pointer to array
3	**a	b	Pointer pointer

*b[size]
b[0]=a[0]; b[1]=a[1]; b[2]=a[2]

1. The formal parameter is a [] [size], use a when calling. Array
2. The formal parameter is (* a) [size], and the actual parameter is a. Pointer to array
3. The parameter is ** a, which is used when calling. Pointer pointer

initialization

memset(a,0,sizeof(a));

Refer_1.1
Refer_1.2
Refer_2