input - Simple cube and square sum function won't run (C) -

learning c, trying code program outputs sum of cube , square of inputted number.

#include <stdio.h>  main() { int a; scanf("%d",a); printf("%d",cube(a)+sqr(a)); }  cube(int x) { return(x*x*x); }  sqr(int arg) { return(arg*arg); } 

when run program outputs seemingly random string of numbers after input number. way fix without changing usage of returns assign variables?

scanf needs pointer:

scanf("%d",&a); 

instead of

scanf("%d",a);