I'm sorry, but i've tried thousands of ways to make the below correct but it just can't work!

int data=add[hold].staff_id;
strcat(c:\windows\desktop\data,".txt");
write.open(data,ios:ut);

does this means strcat can only work for characters? my structure staff id is an integer, therefore it can't combine it with the "txt extension. Is there a way to solve this??

btw...the c:\windows bla bla . Do we use "\" or "/" ???