/in/foo.c: In function 'main':
/in/foo.c:7:10: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 if(k == 1,n ==2)
          ^
/in/foo.c:9:14: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 else if(k ==2,n ==3)
              ^
/in/foo.c:11:15: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  else if(k ==2,n==5)
               ^