A simpler method

int a= 123456

String sa = ""+a; //Convert a number into a string

int alen = sa . length()； Obtained length

The length of Alen is.

can use

int length = 0；

int b = 1；

fo(int n = 1； n & lt300; n++){

b = b * 10；

If (a/b==0){

Length = I；;

Break; }

}

Length will also get the length.