int *p;

p=&a;

int *p;

*p=2;

int a=2, *p=&a;

*p=3;

char str[10];

str[2]='a';

*(str + n * size_of_type) = ...;

*(str + 2 * 1) = 'a';

str[2] = 'a';  // is another way

char *p=str;

str[2] = 'a';

p[2] = 'a';   // does the same

p=str+2;

*p = 'a';

int mat[5][10];

mat[2];

int *p = mat[2];

int *p = &mat[2][0];

int *p = mat[2][0];

void swap(int x, int y)
  {
    int temp=x;
    x=y;
    y=temp;
  }

void main()
  {
    int x=4,y=3;
    swap(x,y);
    printf("x=%d y=%d",x,y);
  }
    

swap (&x, &y);

void swap(int *px, int *py)

void swap(int *px, int *py)
  {
    int temp = *px;   
    *px = *py;      
    *py = temp;
  }

func(arr);

int arr[10], *p=arr;
func(p);

void func(int arr[]);

void func(int *arr);

arr++;

func(mat);

int *p = mat;

int mat[5][10], *p[5], i;

for (i=0; i<5; i++)
  p[i] = mat[i];

p[3][4] = 3;
mat[3][4] = 3;  //  both commands are the same

void func(int mat[][10]);

void func(int (*mat)[10]);

int *mat[10];

int (*mat)[10];

mat++;

int *arr[5];

int *p=arr;

int **p=arr;

char *arr_ptr[3] = {"abcdefghi", "mn", "xy"};

a = strlen(arr_ptr[0]);