请问一下inFile.getline(szBuff, 80);这一句的只用是什么

#include
#include
#include
using namespace std;
int main(void){
ifstream inFile;
char szBuff[80];
inFile.open("in.txt", ios::in);
if (!inFile){
cout << "File open error!" << endl;
exit(2);
}
inFile >> szBuff;
cout << szBuff << endl;
inFile.getline(szBuff, 80);
cout << szBuff << endl;
inFile.close();
return 0;}
请问一下其中inFile.getline(szBuff, 80);这一句是干什么的啊