/in/foo.c: In function 'main':
/in/foo.c:8:5: warning: statement with no effect [-Wunused-value]
   sn+1.0/n;
   ~~^~~~~~
/in/foo.c:9:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(sn>k*1.0);
   ^~
/in/foo.c:10:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    break;
    ^~~~~