/in/foo.c: In function 'main':
/in/foo.c:18:4: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if(a[i]='\0')
    ^~
/in/foo.c:9:14: warning: unused variable 'i' [-Wunused-variable]
  int x=0;int i=0;
              ^