In c++, lets say i want to terminate a program by inserting -1..How to do it using while loop or switch?

Answer 1

My advice would be to use 'Do...While' like

int no = 0;
do
{
blah blah blah
.......................
cout<<"Wanna continue ? (-1 to exit)";
cin>>no;
} while(no != -1) (or) while(no >= 0)
This will work. If you want to use while loop or switch follow similar strategy.

Answer 2

You can use break to jump out of the loop. Then you can return the -1 value from the function. Then you can throw an exception and end the program.

Your question was not very clear.