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22 lines
409 B
C++
22 lines
409 B
C++
#include <iostream>
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#include <iomanip>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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int a, b, c, x;
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> a >> b >> c >> x;
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if (x <= a) {
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cout << 1 << endl;
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} else if (x > b) {
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cout << 0 << endl;
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} else {
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cout << std::fixed << std::setprecision(10) << 1.00 * c / (b - a) << endl;
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}
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return 0;
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}
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