Nested switch statement in C++
Switch-case statements: These are a substitute for long if statements that compare a variable to several integral values
- The switch statement is a multiway branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression.
- Switch is a control statement that allows a value to change control of execution.
Syntax:
switch (n) { case 1: // code to be executed if n = 1; break; case 2: // code to be executed if n = 2; break; default: // code to be executed if // n doesn't match any cases }
Nested-Switch Statement: Nested-Switch statements refers to Switch statements inside of another Switch Statements. Syntax:
switch(n) { // code to be executed if n = 1; case 1: // Nested switch switch(num) { // code to be executed if num = 10 case 10: statement 1; break; // code to be executed if num = 20 case 20: statement 2; break; // code to be executed if num = 30 case 30: statement 3; break; // code to be executed if n // doesn't match any cases default: } break; // code to be executed if n = 2; case 2: statement 2; break; // code to be executed if n = 3; case 3: statement 3; break; // code to be executed if n doesn't match any cases default: }
Example:
CPP
// Following is a simple program to demonstrate // syntax of Nested Switch Statements. #include <iostream> using namespace std; int main() { int x = 1, y = 2; // Outer Switch switch (x) { // If x == 1 case 1: // Nested Switch switch (y) { // If y == 2 case 2: cout << "Choice is 2"; break ; // If y == 3 case 3: cout << "Choice is 3"; break ; } break ; // If x == 4 case 4: cout << "Choice is 4"; break ; // If x == 5 case 5: cout << "Choice is 5"; break ; default : cout << "Choice is other than 1, 2 3, 4, or 5"; } return 0; } |
Output:
Choice is 2