#include <stdio.h>
// A normal function with an int parameter
// and void return type
void fun(int a)
{
    printf("Value of a is %d\n", a);
}
  
int main()
{
    // fun_ptr is a pointer to function fun() 
    void (*fun_ptr)(int) = &fun;
  
    /* The above line is equivalent of following two
       void (*fun_ptr)(int);
       fun_ptr = &fun; 
    */
  
    // Invoking fun() using fun_ptr
    (*fun_ptr)(10);
  
    return 0;
}

#include <stdio.h>
int main()
{ int* pc, c; c = 22; printf("Address of c: %p\n", &c); printf("Value of c: %d\n\n", c); // 22 pc = &c; printf("Address of pointer pc: %p\n", pc); printf("Content of pointer pc: %d\n\n", *pc); // 22 c = 11; printf("Address of pointer pc: %p\n", pc); printf("Content of pointer pc: %d\n\n", *pc); // 11 *pc = 2; printf("Address of c: %p\n", &c); printf("Value of c: %d\n\n", c); // 2 return 0;
}

int* p;

#include <stdio.h>
int main()
{ int *p; int var = 10; p= &var; printf("Value of variable var is: %d", var); printf("\nValue of variable var is: %d", *p); printf("\nAddress of variable var is: %p", &var); printf("\nAddress of variable var is: %p", p); printf("\nAddress of pointer p is: %p", &p); return 0;
}
#output
#Value of variable var is: 10
#Value of variable var is: 10
#Address of variable var is: 0x7fff5ed98c4c
#Address of variable var is: 0x7fff5ed98c4c
#Address of pointer p is: 0x7fff5ed98c50

Value of a is 10

#include<stdio.h>
#include<stdlib.h>
main()
{ int *p; p=(int*)calloc(3*sizeof(int)); printf("Enter first number\n"); scanf("%d",p); printf("Enter second number\n"); scanf("%d",p+2); printf("%d%d",*p,*(p+2)); free(p);
}