#include <stdio.h> void foo(int *p, int x){ *p=x; } int main(){ int *z; int a = 20, b = 25; z = &a; foo(z,b); printf("%d",a); return 0; }The output of the given C program is ________. (Answer in integer)

Let us trace the execution of the program step by step:

1. Inside main(), integer variables a and b are initialized with values 20 and 25, respectively.

2. The pointer z is assigned the address of a (z = &a), meaning z points to a.

3. The function call foo(z, b) passes the pointer z (address of a) by value to the pointer parameter p, and the value of b (25) to x.

4. Inside foo(), the statement *p = x; dereferences pointer p and assigns the value 25 to the memory location pointed to by p (which is variable a). Thus, a becomes 25.

5. After foo() returns, printf("%d", a); prints the updated value of a, which is 25.