/in/foo.c: In function 'main':
/in/foo.c:17:1: error: expected ';' before 'if'
 if (a<b) {t=a;a=b;b=t;}
 ^~
/in/foo.c:15:14: warning: unused variable 't' [-Wunused-variable]
  int a,b,c,d,t;
              ^