using std::ostream;
The IO library is in STD, so you should declare it before using it
Read More:
- The document “ostream” could not be saved. You don’t have permission
- C error C2143 syntax error missing before ‘type’
- C + + common errors: “error: XXX in namespace ‘STD’ does not name a template type”
- Solve the problem of error: cannot pass objects of non trivially copyable type ‘STD:: String’ in C / C + +
- Error c3861: “strcasecmp”: identifier not found
- Arduino reports an error when writing a custom library file to solve the problem of not name of type, not declared in this scope
- Solutions to error c2143: syntax error: missing ‘;’ before ‘type’ in C + + program compilation
- Access restriction: the type ‘application’ is not API (restriction on required LIB)
- Error type referred to is not an annotation type:RedisCache
- Error: property ‘TZ’ does not exist on type ‘type of moment’
- C / C + + cannot open the source file directory, the header file is not imported, the solution is as follows
- Error: (22,57) Java: type parameter… Mapper is not in the range of type variable M
- C + + error prototype for… Does not match any in class
- Various errors (c + +)
- C++ Error: allocating an object of abstract class type
- error CS0234: The type or namespace name ‘UI‘ does not exist in the namespace ‘UnityEngine‘
- To solve the running error of eclipse for C / C + +: launch failed binary not found
- Error: unrecognized command line option “-std=c++11”, to solve the problem that ubuntu does not support c++11
- C language string processing error warning, c4996, sprintf, predicted, c4996, strcpy, c4996, strcat
- About the prompt: invalid use of incomplete type