Charging Iphone 5S with Cable

Dear Dudes,
I have bought my ihpne 5S 3 month ago but last night when I plugged it into outlet, it does not charging. when i use PC USB it start charging !!!!
I have not tested any other charging cable but:
if cable is damaged, why it is charging by USB!!!
If adaptor is damaged, why it is charging my Ipad!!!
pleeeease help me

thanks in advance