switch Statement

1. Program to read a single digit number and print in words.

   #include<stdio.h>
   int main(){
     int digit;
     scanf("%d",&digit);
     switch(digit){
       case 0:
           printf("Zero");
           break;
       case 1:
           printf("One");
           break;
       case 2:
           printf("Two");
           break;
       case 3:
           printf("Three");
           break;
       case 4:
           printf("Four");
           break;
       case 5:
           printf("Five");
           break;
       case 6:
           printf("six");
           break;
       case 7:
           printf("Seven");
           break;
       case 8:
           printf("Eight");
           break;
       case 9:
           printf("Nine");
           break;
       default:
           printf("Given number is not a single digit number.");
     }
     return 0;
   }
   

   Sample Input1:
   9
   Sample Output1:
   Nine
   Sample Input1:
   29
   Sample Output1:
   Given number is not a single digit number.
   

2. Program to display number of days in a given month.

   #include<stdio.h>
   int main() {
     int month;
     scanf("%d",&month);
     switch(month){
       case 1:
       case 3:
       case 5:
       case 7:
       case 8:
       case 10:
       case 12:
           printf("31 days");
           break;
       case 2:
           printf("28 days in Non-Leap Year and 29 days in Leap Year");
           break;
       case 4:
       case 6:
       case 9:
       case 11:
           printf("30 days");
           break;
       default:
           printf("Invalid month");
     }
     return 0;
   }
   

   Sample Input1:
   2
   Sample Output1:
   28 days in Non-Leap Year and 29 days in Leap Year
   Sample Input2:
   4
   Sample Output2:
   30 days
   

3. Program to perform simple calculator operation.

   #include<stdio.h>
   int main() {
     int num1, num2;
     char oper;
     scanf("%d%c%d",&num1,&oper,&num2);
     switch(oper){
       case '+':
             printf("%d",num1+num2);
             break;
       case '-':
             printf("%d",num1-num2);
             break;
       case '*':
             printf("%d",num1*num2);
             break;
       case '/':
             printf("%d",num1/num2);
             break;
       case '%':
             printf("%d",num1%num2);
             break;
       default:
             printf("Invalid operation");
     }
     return 0;
   }
   

   Sample Input:
   4%5
   Sample Output:
   4