Explain nested switch case in C language

Problem

Write a C program to check the entered password by the user is valid or not based on his/her ID using nested switch case.

Solution

The solution is explained below −

• In C language, we can write inner switch which is placed in an outer switch.

• The case values of the inner and outer switch can have common values.

Rules

• An expression executes to a result.
• Constants and unique values must be used for case labels.
• Case labels has to be end with a colon ( : ).
• A break keyword has to be included in each case.
• There can be only one default label.
• We can write nested multiple switch statements.

Example

Following is the C program to check the entered password by the user is valid or not based on his/her ID using nested switch case −

 Live Demo

#include <stdio.h> int main(){    int userid;    int pwd;    printf("enter userid:
");    scanf("%d",&userid);    switch (userid){       case 1234:          printf("enter password:
 ");          scanf("%d", & pwd);       switch (pwd){          case 0000:             printf("Tutorials Point
");          break;             default:          printf("incorrect password");             break;       }       break;          default:       printf("incorrect userid");          break;    } }

Output

You will see the following output −

Run 1:enter userid: 1234 enter password: 0000 Tutorials Point Run 2: enter userid: 1234 enter password: 234 incorrect password