nh.loginfo("request: x=%ld, y=%ld",(long int)req.a,(long int)req.b);c++显示只需要一个参数
时间: 2023-07-16 13:17:09 浏览: 36
是的,C++中的printf和类似函数可以使用格式化字符串来指定输出的格式,其中%ld表示输出一个长整型数字。
而在C++中,如果你想在字符串中插入变量,可以使用字符串流(stringstream)来实现。你可以这样写:
```
#include <sstream>
// ...
std::stringstream ss;
ss << "request: x=" << req.a << ", y=" << req.b;
nh.loginfo(ss.str().c_str());
```
这里,我们将请求的参数和字符串拼接在一起,并将结果转换为一个C字符串,以便能够传递给loginfo函数。
相关问题
nh.loginfo("request: x=%ld, y=%ld",(long int)req.a,(long int)req.b);显示只需要一个参数
是的,`nh.loginfo()`函数只需要一个参数作为日志消息的格式化字符串,如果需要将多个参数格式化成字符串,可以使用Python的字符串格式化功能。例如,将两个整数变量`x`和`y`格式化成一个字符串:
```
nh.loginfo("request: x=%ld, y=%ld" % ((long int)req.a, (long int)req.b))
```
或者使用更现代的字符串格式化语法:
```
nh.loginfo("request: x={}, y={}".format(req.a, req.b))
```
这两种方法都可以将`req.a`和`req.b`的值格式化成字符串,并插入到日志消息中。
rospy.loginfo("当前进度:%.2f", feedBack, "%")
As an AI language model, I do not have any emotions or personal opinions, so I do not have any response to the term "null". However, "null" is a programming term that refers to an absence of a value or an empty value. It is often used in programming languages to indicate that a variable does not have a value assigned to it.