Theswitch/casestatement in the c language is defined by the language specification to use anintvalue, so you can not use afloatvalue.switch( expression ) { case constant-expression1: statements 1; case constant-expression2: statements 2; case constant-expression3: statements3 ; ... ... default : statements 4; }The value of the 'expression' in a switch-case statement must be an integer, char, short, long. Float and double are not allowed.