如何让字符数组在一行而不是多行中打印出来?

如何在 c++ 中打印出字符数组 (msg(？我的输出将我加密的单词打印在不同的行上，而不仅仅是一个行。此外，"输入一行文本或'完成'"最终会重复。我假设它是因为单词之间的空格。我该如何解决这个问题？任何建议都会有所帮助！

int main()
{
ofstream outputFile;
string fileName; //initiate variables
char msg[100]; 
int i;
std::cout<< "Enter file name to encrypt: "; //get file name from user
std::cin >> fileName; //save file name 
outputFile.open(fileName);
while(true){
std::cout<< "Enter a line of text or '" << "done" << "' to quit: "; //get line of text from user
std::cin>> msg; //send line of text to message array 
if (msg[0] == 'd' && msg[1] == 'o' && msg[2] == 'n' && msg[3] == 'e'){//check if done is input
break; //if done is entered, break program
}
else{
for(i = 0; (i < 100 && msg[i] != ''); i++){ //loops thru encrypting each letter
msg[i] = msg[i] + 1; //encrypt text 
}
outputFile << msg << endl; //send encrypted string/message to file from user
std::cout << "Encrypted message: " << msg << endl; //print encrypted text to screen
}
}
outputFile.close(); //close file
return 0;
}