How can this while loop be modified into a for loop In C int

How can this while loop be modified into a for loop? (In C++)

int pushup;
int energy;

pushup=0;

cout<<\"Please enter your level of energy (in number units): \";
cin>>energy;
while ( energy>=2)
{
pushup++;
energy-=2;
}
cout<<\"Pushup=\"<<pushup<<endl;

Solution

Solution.cpp

#include <iostream>//header file for input output function
using namespace std;//it tells the compiler to link std namespace

int main()
{//main fucntion
int pushup;//variable declaration
int energy;

pushup=0;

cout<<\"Please enter your level of energy (in number units): \";
cin>>energy;//key board inputting
for(;energy>=2;energy=energy-2)
{//for loop
   pushup++;
}
cout<<\"Pushup=\"<<pushup<<endl;
return 0;
}

output

Please enter your level of energy (in number units): 9

Pushup=4

Please enter your level of energy (in number units): 0

Pushup=0