Arduino joining two int's -

hello have 2 variables timer1hh = 9 timer1mm = 7

i convert them strings, join them , "97" using code below:

string string1= string(timer1hh);  string string2= string(timer1mm); string string3;           string3=string1+string2;       serial.println(string3); 

thats fine want add leading 0 if below 10 like.

"0907"

so want able "if" between "0907" , "2034" type of thing. im totally blagged sprintf using "%02" , not working me.

any great.

pete

see sketch:

void setup() {      int timer1hh = 9, timer1mm = 7;      serial.begin(9600);     //string string1= string(timer1hh);      //string string2= string(timer1mm);     //string string3;               char out1[5];     sprintf(out1,"%.2d%.2d", timer1hh,timer1mm  );     string string3(out1);      //string3=string1+string2;           serial.println(string3); }  void loop() {} 

serial output: 0907