You all are familiar with switch case in C/C++, but did you know you can use range of numbers instead of a single number or character in case statement.
- That is the case range extension of the GNU C compiler and not standard C or C++
- You can specify a range of consecutive values in a single case label, like this:
case low ... high:
- It can be used for ranges of ASCII character codes like this:
case 'A' ... 'Z':
- You need to Write spaces around the ellipses … . For example, write this:
// Correct - case 1 ... 5: // Wrong - case 1...5:
1 in range 1 to 6 5 in range 1 to 6 15 not in range 20 in range 19 to 20
Exercise : You can try above program for char array by modifying char array and case statement.
- low > high : The compiler gives with an error message.
- Overlapping case values : If the value of a case label is within a case range that has already been used in the switch statement, the compiler gives an error message.
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