Why there is no output?

#1

please check it and run the code

#2

Check your loop section. You are not updating left and right pointer when there is a match.
It must be something like this:
Something like this:

while(l<r){

cs= a[l]+a[r];

if(cs>target){
    r--;
}
else if(cs==target){
     cout<<a[l]<<" and "<<a[r]<<endl;
     l++;
     r--;
}
else  l++;

}