Segmentation Fault when attempting to print value in C

Question

The following C code returns a \"segmentation fault\" error. I do not understand why it does not return the value 20. What is my error?

#include 

        

Answer 1

You are trying to write 20 in garbage value. You must allocate space for it by using one of *alloc() functions or creating an int on stack and getting the andress of it(as Richard J. Ross III mentioned on comments).

dynamic allocation:

int n*; 
n = malloc(sizeof(int));  /* allocate space for an int */
if(n != NULL) {
 /* do something.. */ 
 free(n); /* free 'n' */
} else {
  /*No space available. */
}

or on the stack:

int int_on_stack;
int *n = &int_on_stack;
*n = 20;
printf("%i\n", *n); // 20