#include <iostream>
using namespace std;
int main()
{
double x;
cin >> x;
if (x >= 0 && x <= 100)//不能写0 <= x <= 100
{
if (x > 75) cout << "Intervalo (75,100]";
else if (x > 50) cout << "Intervalo (50,75]";
else if (x > 25) cout << "Intervalo (25,50]";
else cout << "Intervalo [0,25]";
}
else cout << "Fora de intervalo";
return 0;
}
或
#include <iostream>
using namespace std;
int main()
{
double x;
cin >> x;
if (x >= 0 && x <= 25) cout << "Intervalo [0,25]";
else if (x > 25 && x <= 50) cout << "Intervalo (25,50]";
else if (x > 50 && x <= 75) cout << "Intervalo (50,75]";
else if (x > 75 && x <= 100)cout << "Intervalo (75,100]";
else cout << "Fora de intervalo";
return 0;
}