c - What is the difference between foo(int arr[]) and foo(int arr[10])? -

is there difference between 2 function in c?

void f1(int arr[]) {     //some code...   } void f2(int arr[10]) { //some code } 

what size of first array in f1 function?

is there difference between 2 function in c?

no difference here. both interpreted int *arr compiler arrays converted pointer first element when used function parameter.

what size of first array in f1 function?

strictly speaking, there no array here. pointer int. if use sizeof(arr), value equal sizeof(int *).

the array size in parameters needed when type of parameter pointer array. in case need have specify size of array each size makes pointer point different type.

void f3(int (*arr)[10]); // expects pointer array of 10 int