当你在编程时遇到错误消息“cin was not declared in this scope”,这通常意味着编译器在当前作用域内找不到cin的定义。下面是一些可能的解决步骤和考虑因素: 检查代码中是否包含了正确的头文件: cin是C++标准库中的一个对象,用于从标准输入(通常是键盘)读取数据。确保你的代码中包含了<iostream>头文件,...
c++中[Error] 'cin' was not declared in this scope的意思是:cin(标准输入流)未申明。在C++中cin:标准输入流、cout:标准输出流、cerr:错误的标准输出流、clog:用于记录的标准输出流的引用,需要需要#include<iostream>头文件来声明。作为iostream(.h)库的一部分,头文件<iostream(.h)>声明...
满意答案 c++中[Error] 'cin' was not declared in this scope的意思是:cin(标准输入流)未申明。 在C++中cin:标准输入流、cout:标准输出流、cerr:错误的标准输出流、clog:用于记录的标准输出流的引用,需要需要#include<iostream>头文件来声明。 作为iostream(.h)库的一部分,头文件<iostream(.h)>声明了一些用...
std::cout 如果你这样做,那么你就是在编写可移植的、易于阅读的C++。更好的是,检查数据是否已成功读...
shapewipe.C:409:48: error: ‘png_infopp_NULL’ was not declared in this scope shapewipe.C: In member function ‘void ShapeWipeMain::reset_pattern_image()’: shapewipe.C:517:15: warning: large integer implicitly truncated to unsigned type ...
is deprecated (declared at ../quicktime/ffmpeg/libavcodec/avcodec.h:2324) [-Wdeprecated-declarations] filebase.C: In member function ‘void FileBase::append_history(const void*, SampleFormat, int, int)’: filebase.C:320:8: error: ‘SAMPLE_FMT_DBL’ was not declared in this scope ...
./test32.cpp: In function ‘int main()’: ./test32.cpp:9:16: error: ‘j’ was not declared in this scope 9 | cout<<a[i][j]<<" "; | ^ [root@iZuf6gwz144knouajmu4naZ test]# vim test32.cpp [root@iZuf6gwz144knouajmu4naZ test]# ...
绝对可以...除非你重载了cin...一般来说,cin属于istream...cout属于ostream 文件输入属于ifstream 文件输出属于ofstream 弱弱地问一句,你用了iostream的头文件和std的名空间了么?再次弱弱地回一句,没有iostream这个头文件就不能用cin了。。。
从文件读取信息 打开文件 从文件中读取信息或者向文件写入信息之前,必须先打开文件。 void open(const ...
filebase.C: In member function 'void FileBase::append_history(constvoid*, SampleFormat, int, int)': filebase.C:320:8: error: 'SAMPLE_FMT_DBL' was not declared in this scope make[3]: *** [filebase.o] Error 1 So I need to find where the filebase.C is referencing external ffmpeg...