/in/foo.c: In function 'main':
/in/foo.c:6:3: error: expected ';' before 'if'
   if(a>b)  {t=a;a=b;b=t}
   ^~
/in/foo.c:4:13: warning: unused variable 't' [-Wunused-variable]
   int a,b,c,t;
             ^