/in/foo.c: In function 'main':
/in/foo.c:5:21: warning: unused variable 'm2' [-Wunused-variable]
  int m,s,t,s1,s2,m1,m2;
                     ^
/in/foo.c:5:18: warning: variable 'm1' set but not used [-Wunused-but-set-variable]
  int m,s,t,s1,s2,m1,m2;
                  ^
/in/foo.c:5:15: warning: unused variable 's2' [-Wunused-variable]
  int m,s,t,s1,s2,m1,m2;
               ^
/in/foo.c:6:9: warning: 'm' is used uninitialized in this function [-Wuninitialized]
  m1=m-(m%10);
         ^
/in/foo.c:7:4: warning: 's' is used uninitialized in this function [-Wuninitialized]
  s1=s-(60*(m/10));
    ^