C Programming - Arrays - Discussion

#include<stdio.h>
int main()
{
int a=5;
printf("%d %d %d %d %d", a++, a--, ++a, --a, a);
return 0;
}
when i compile this programme in gcc compiler the output as 4 5 5 5 5
because,programme excute from right to left so
a=5
--a predecrement so --a=4
++a preincrement so ++a=5
a-- postdecrement so actual value is 4,but first a value 5 is printed then it will decrement.
a++ postincrement so actual value is 5,but first a value 4 is printed then it will increment.
but all preincrements and predecrements get final a value 5 and postdecrements & postincrements doesn't change.
then the output is 4 5 5 5 5.

First it will read the variable part i.e, (*ptr) and after that it will go anti-clock wise direction then it will read array part([]). Then it will go to before (*ptr)[10]. There is nothing so it will leave.

char *ptr[10]; is an array of 10 pointers to characters.

char (*ptr)[10]; pointer to array of 10 characters.

void main()
{
int (*d)[10];
d[0] = 7;
d[1]=10;
printf("%d\n",*d);
}

It should print 10 but compiler is showing error such as follows:

test.c:4:7: error: incompatible types when assigning to type \'int[10]\' from type \'int\'

Here ptr is the pointer it is represented by using *...! then the symbol [] shows that it is an array and 10 implies the size of that array.

If any one clear about ptrs please explain clearly. Because I don't understanding anything belong to this.

As we know ptr holds the address of variables, and *ptr means what is the value of variables on that address.

(*ptr) is a pointer. It point out the array of value [10]. So option B is correct.

Int (*ptr)[10];

It's a pointer to an array of 10 integers.

Notice that the array doesn't have a name of its own. We're using the pointer "ptr" to access the array.

The array will be created anywhere in the memory and the only way to access the array is via the pointer "ptr".

Here size of an array is assinged to 10 and * has been used to declare pointer funtion so compiler will automatically consider it as an pointer funtion.Here it simply means it is a pointer funtion consisting of 10 elements.