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ROS_INFO macro accepts C-style printf formatting parameters as in this example from "Mastering ROS'":

ROS_INFO("From Client [%s], Server says [%s]",req.in.c_str(),res.out.c_str())

ROS_INFO_STREAM macro accepts C++ style std::iostream formatting as in this example from "A Gentle Introduction to ROS":

ROS_INFO_STREAM("Sending␣random␣ velocity ␣command: " << "␣ linear=" << msg. linear . x << "␣angular=" << msg. angular . z)

ROS_INFO macro accepts C-style printf formatting parameters as in this example from "Mastering ROS'":

ROS_INFO("From Client [%s], Server says [%s]",req.in.c_str(),res.out.c_str()) [%s]", req.in.c_str(), res.out.c_str())

ROS_INFO_STREAM macro accepts C++ style std::iostream formatting as in this example from "A Gentle Introduction to ROS":

ROS_INFO_STREAM("Sending␣random␣ velocity ␣command: " << "␣ linear=" << msg. linear . x << "␣angular=" << msg. angular . z)

ROS_INFO macro accepts C-style printf formatting parameters as in this example from "Mastering ROS'":

ROS_INFO("From Client [%s], Server says [%s]", req.in.c_str(), res.out.c_str())

ROS_INFO_STREAM macro accepts C++ style std::iostream formatting as in this example from "A Gentle Introduction to ROS":

ROS_INFO_STREAM("Sending␣random␣ ROS_INFO_STREAM("Sending random velocity ␣command: command: " << "␣ linear=" << msg. linear . x << "␣angular=" "angular=" << msg. angular . z)

ROS_INFO macro accepts C-style printf formatting parameters as in this example from "Mastering ROS'":

ROS_INFO("From Client [%s], Server says [%s]", req.in.c_str(), res.out.c_str())

ROS_INFO_STREAM macro accepts C++ style std::iostream formatting as in this example from "A Gentle Introduction to ROS":

ROS_INFO_STREAM("Sending random velocity command: " << "␣ " linear=" << msg. linear . x << "angular=" << msg. angular . z)