C language pointer and array details knowledge points

Disclaimer: This is a little bit of my experience, I hope it will be helpful to everyone.

void minmax(int a[],int len,int *min,int *max)

{
    int i;
    *min=*max=a[0];
    for(i=1;i<len;i++)
    {
        if(a[i]<*min)
        {*min=a[i];}
        if(a[i]>*max)
        {*max=a[i];}
    }
}
        
int main()
{
    int a[]={1,2,3,6,7,11,5,16,9,10};
    int min,max;
    minmax(a,sizeof(a)/sizeof(a[0]),&min,&max);
    printf("min=%d,max=%d\n",min,max);
    return 0;

}

1. The array in the table in the function parameter is actually a pointer

2.sizeof(a)==sizeof(int *)

3. But you can use the array operator [] to operate

The following four function prototypes are equivalent

int sum (int * ar, int n);
 int sum (int *, int);
 int sum (int ar [], int n);

 int sum(int [],int);  

 Note:   Suppose int b[]; can be seen as int *const b;

b[]=a;  Wrong ; Array variables cannot be assigned, and array variables can be regarded as const pointers and cannot be assigned.