To write specific data values from large file in c++

I am mentioning some data of my large data files:

TotEng = -11097.6192 KinEng = 11146.4491 Temp = 303.2194

PotEng = -22244.0684 E_bond = 3836.4889 E_angle = 7976.8498

E_dihed = 486.0938 E_impro = 0.0000 E_vdwl = -2320.3438

E_coul = 36613.6339 E_long = -46944.6797 Press = 551.3530

---------------- Step 31650500 ----- CPU = 15.1942 (sec) ---------------

Here are only 5 lines and in my large data files ,I have 4005 lines whose pattern of writting is similar to above one and in my large data files, I only need Press data which is in decimal form

#include<iostream>
#include<fstream>
#include<string>
#include <unistd.h>
using namespace std;

#define FILE_IN "pressureinputrequire.out"
#define FILE_OUT "pressureoutputrequire.out"

int main()
{
string uselessfirst,uselesssecond,uselessthird,uselessfourth,pressure[801];


ifstream input;
ofstream output;

input.open(FILE_IN);
if(!input)
{
cout<<"n can't find input file"<<FILE_IN;
return 0;}

output.open(FILE_OUT);

while(!input.eof())
{
for(int j=0; j<801; ++j)
{getline(input,uselessfirst);
 getline(input,uselesssecond);
 getline(input,uselessthird);
 input.seekg(66);
 getline(input,pressure[j]);
 write(output,pressure[j]);
 getline(input,uselessfourth);
 }}

 input.close();
 output.close();
 return 0;}

And errors are generating:

1)invalid user-defined conversion from ‘std::ofstream {aka std::basic_ofstream}’ to ‘int’ [-fpermissive] write(output,pressure[j]);

2) caot convert ‘std::string {aka std::basic_string}’ to ‘const void*’ for argument ‘2’ to ‘ssize_t write(int, const void*, size_t)’ write(output,pressure[j]);