IOS numbers are separated by commas every 3 bits

Demand:

1. Only integers, no decimals

+ (NSString *) Stringwithcharmcount: (NSString *) charmcount{//the string to be split into a mutable stringNsmutablestring *countmutstr =[[Nsmutablestring Alloc]initwithstring:charmcount]; //string LengthNsinteger length =countmutstr.length; //DivisorNsinteger divisor = length/3; //remainderNsinteger remainder = length%3; //How many commas are there?Nsinteger Commacount; if(Remainder = =0) {//when the remainder is 0, the divisor -1== the number of commasCommacount = divisor-1; }Else{//otherwise divisor = = Comma numberCommacount =Divisor; }    //depending on the number of commas, the for loop is separated by commas     for(inti =1; i<commacount+1; i++) {[Countmutstr insertstring:@","Atindex:length-i *3]; }    returncountmutstr;}

IOS numbers are separated by commas every 3 bits