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 haven't allocated memory to n, so

*n = 20;

attempts to write unspecified memory.

Try

#include 

int *n = malloc(sizeof *n);
/* use n */
free(n);