/in/foo.c: In function 'main':
/in/foo.c:22:19: warning: unused variable 'sum3' [-Wunused-variable]
     int sum1,sum2,sum3,cnt=0,n,i,j;
                   ^~~~
/in/foo.c:22:14: warning: unused variable 'sum2' [-Wunused-variable]
     int sum1,sum2,sum3,cnt=0,n,i,j;
              ^~~~
/in/foo.c:22:9: warning: unused variable 'sum1' [-Wunused-variable]
     int sum1,sum2,sum3,cnt=0,n,i,j;
         ^~~~