how to do sleep or delay in mac Xcode 4.3.3

[pateman90]

i am trying t do a delay for 60 seconds.

how do i do the sleep or delay command?

this is what i have:

 
int a = 61;
{cout<< "to many tries, please wait 1 minute \n";
                   while (a > 0) {
                        sleep(1);
                        a--;
                        cout<<"time left:"<<a;
                    };  

it doesn't come back wrong but it doesn't print the numbers going down it just ends.