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#include <iostream>#include <string>using namespace std; int main(int argc, char *argv[]) {        cout << "Tec-kalkulator v0.4!" << endl << endl;            while (true) {                double tall1;                double tall2;                double svar;                char tegn;                        cout << "Skriv inn ditt regnestykke: ";                cin >> tall1 >> tegn >> tall2;                        switch (tegn) {                        case '+':                                svar = tall1 + tall2;                                break;                        case '-':                                svar = tall1 - tall2;                                break;                        case '*':                                svar = tall1 * tall2;                                break;                        case '/':                                svar = tall1 / tall2;                }                        cout << "Svaret er " << svar << endl << endl;        }                return EXIT_SUCCESS;}