for循环
#include<iostream>
using namespace std;
double n;
int a;
int main()
{
for(int i = 1; i <= 6; i ++)
{
cin >> n;
if(n > 0) a += 1/*a++也可*/;
}
cout << a << " positive numbers";
return 0;
}
while循环
#include<iostream>
using namespace std;
int main()
{
int a = 0, n = 6;
while(n --)
{
double c;
cin >> c;
if(c > 0) a ++;
}
cout << a << " positive numbers";
return 0;
}
do while循环
#include<iostream>
using namespace std;
int main()
{
int a = 0, n = 5;
do//n要减一故n=5二不是6
{
double c;
cin >> c;
if(c > 0) a ++;
}
while(n --);
cout << a << " positive numbers";
return 0;
}