What is switch case?

Answer 1

Its a conditional, like if case. you can evaluate more cases with switch.

switch(x){
case 0:
//do code0
case 1;
//do code1}

Its like

if (x == 0) code0;
if(x==1)code1;

Answer 2

switch is an alternative to nested if else selection

Answer 3

Both the above mentioned answers are correct