申論題

#include <iostream>
#include <cstdlib> // for atoi
using namespace std;

int main(int argc, char* argv[]) {
    int sum = 0;
    try {
        for (int i = 1; i < argc; ++i) {
            // Check if the conversion from string to integer is successful
            char* end;
            long val = strtol(argv[i], &end, 10);
            if (*end != '\0' || end == argv[i]) throw invalid_argument("Invalid input");
            sum += val;
        }
        double average = static_cast<double>(sum) / (argc - 1);
        cout << "The sum is " << sum << "." << endl;
        cout << "The average is " << fixed << setprecision(1) << average << "." << endl;
    } catch (const invalid_argument& e) {
        cout << "Incorrect Input!" << endl;
        return 1; // Non-zero return value to indicate error
    }
    return 0; // Success
}