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4-b19.cpp
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4-b19.cpp
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/*1953609 软件 王灏廷*/
#include <iostream>
using namespace std;
int max(int a, int b)
{
if (a > b) return a;
else return b;
}
int max(int a, int b, int c)
{
if (b > a)
a = b;
if (c > a)
a = c;
return a;
}
int max(int a, int b, int c, int d)
{
if (b > a)
a = b;
if (c > a)
a = c;
if (d > a)
a = d;
return a;
}
int main()
{
int num, a, b, c, d;
while (1)
{
cout << "请输入个数num及num个正整数:" << endl;
cin >> num;
if (!cin.good())
{
cin.clear();
cin.ignore(2147483647, '\n');
continue;
}
if (num < 2 || num>4)
{
cout << "个数输入错误" << endl;
break;
}
if (num == 2)
{
cin >> a >> b;
if (!cin.good() || a <= 0 || b <= 0)
{
cin.clear();
cin.ignore(2147483647, '\n');
continue;
}
cin.clear();
cin.ignore(2147483647, '\n');
break;
}
else if (num == 3)
{
cin >> a >> b >> c;
if (!cin.good() || a <= 0 || b <= 0 || c <= 0)
{
cin.clear();
cin.ignore(2147483647, '\n');
continue;
}
cin.clear();
cin.ignore(2147483647, '\n');
break;
}
else if (num == 4)
{
cin >> a >> b >> c >> d;
if (!cin.good() || a <= 0 || b <= 0 || c <= 0 || d <= 0)
{
cin.clear();
cin.ignore(2147483647, '\n');
continue;
}
cin.clear();
cin.ignore(2147483647, '\n');
break;
}
}
switch (num)
{
case 2:
cout << "max=" << max(a, b) << endl;
break;
case 3:
cout << "max=" << max(a, b, c) << endl;
break;
case 4:
cout << "max=" << max(a, b, c, d) << endl;
break;
default:
break;
}
return 0;
}