How to Resolve Compilation Errors When Using Case Ranges in Switch Statements?

Case Ranges in Switch Statements: Resolving Compilation Errors

Introduction

When attempting to compile code employing a switch statement with case ranges, you may encounter errors if the compiler does not support case ranges as an extension of the C standard. This article provides a solution to this issue.

Problem Encountered

The given code snippet:

#include <iostream>
using namespace std;

int main(){
    int score;

    //Vraag de score
    cout << "Score:";
    cin >> score;

    //Switch
    switch(score){
        case >= 100:
            cout << "a";
            break;
        // ... (other cases omitted)
    }
    return 0;
}

generates compilation errors due to the use of case ranges (e.g., case >= 100).

Solution: Case Range Support

Some compilers support case ranges as an extension to C . To resolve the compilation issue, use the following syntax for case ranges:

case a ... b:

where a and b are the lower and upper bounds of the range.

Updated Code:

The updated code snippet would look like:

#include <iostream>
using namespace std;

int main(){
    int score;

    //Vraag de score
    cout << "Score:";
    cin >> score;

    //Switch
    switch(score){
        case 0:
            cout << "a";
            break;
        case 1 ... 9:
            cout << "b";
            break;
        // ... (other cases omitted)
    }
    return 0;
}

Note that the lower bound of the first case range (0) is inclusive, while the upper bound of all subsequent case ranges is exclusive.

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