21 lines
461 B
C++
21 lines
461 B
C++
#include <iostream>
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using namespace std;
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int main() {
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int n;
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cout << "Enter a four-digit number: ";
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cin >> n;
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if (n < 1000 || n > 9999) {
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cout << "Error! This is not a four-digit number." << endl;
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} else {
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int a = n / 1000;
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int b = (n / 100) % 10;
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int c = (n / 10) % 10;
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int d = n % 10;
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int r = c * 1000 + d * 100 + a * 10 + b;
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cout << "Result: " << r << endl;
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}
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return 0;
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}
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