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- (NSString*) numberToMathString:(float) num { NSArray * array = [[NSString stringWithFormat:@"%.2f",num/100] componentsSeparatedByString:@"."]; int len = [array[0] length]; int x = len%3; int y = len/3; int dotNumber = y; if (x == 0) { dotNumber -= 1; x = 3; } NSMutableString * rs = [@"" mutableCopy]; [rs appendString:[array[0] substringWithRange:NSMakeRange(0, x)]]; for (int i=0; i<dotNumber; i++) { [rs appendString:@","]; [rs appendString:[array[0] substringWithRange:NSMakeRange(x + i*3, 3)]]; } [rs appendString:@"."]; [rs appendString:array[1]]; return rs; }