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// 08-stringstream2.cpp : validate input to calculator function

import std;

using namespace std;

int main() {

string s;

double a, b;

char op;

for (;;) {

cout << "Please enter a calculation to perform (Number Operator Number):\n";

getline(cin, s);

if (s.empty()) {

break;

}

istringstream iss{s};

iss >> a >> op >> b;

if (iss.fail() || !iss.eof()) {

cout << "Bad input!\n";

}

else {

cout << "Input read successfully.\n";

}