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                            php中浮點型都是雙精度,小數部分超出14位會四舍五入,整數部分超出14位會科學計數法,超出浮點數范圍會輸出INF

范圍1.8E-308 ~ 1.8E+308 E是以10為底的幾次方 round()方法取整數部分

浮點數不要進行大小比較和運算

例子: $v1=8.1; if(round($v1/3\*10000)== round(2.7\*10000) ) {echo $v1.”/3等于2.7”;}

else{echo $v1.”/3不等于2.7”}


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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