gfg c pointer basic

Question

What changes must be done for printing value 5.

#include <stdio.h>

int main()
{
 int var;  /*Suppose address of var is 2000 */

 void *ptr = &var;
 *ptr = 5;
 printf("var=%d and *ptr=%d",var,*ptr);
             
 return 0;
}

Answer 1

changes to be made are in bold

#include <stdio.h>

int main()
{
 int var;  /*Suppose address of var is 2000 */

 void *ptr =&var;
 var= 5;
 printf("var=%d and *ptr=%d",var,*(int*)ptr);
             
 return 0;
}

Answer 2

Before accesing the void pointer it should be typecast to respective datatype

#include <stdio.h>
int main()
{
int var;  /*Suppose address of var is 2000 */

 void *ptr = &var;
*(int *)ptr = 5;
printf("var=%d and *ptr=%d",var,*(int *)ptr);

 return 0;
}