/in/foo.c: In function 'main':
/in/foo.c:10:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   10 |                 if(a=0){
      |                    ^
/in/foo.c:12:40: warning: too many arguments for format [-Wformat-extra-args]
   12 |                                 printf(".2f",x1);
      |                                        ^~~~~