What does extern mean in a function declaration?

.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML

Home Hot About Collections Index RSS Atom Ask

Tester Developer DBA Windows JAR DLL Files Certificates RegEx Links Q&A Biotech Phones Travel FAQ Forum

Home > C++

✍: Guest

It tells the compiler that a variable or a function exists, even if the compiler hasn’t yet seen it in the file currently being compiled. This variable or function may be defined in another file or further down in the current file.

2012-03-09, 2531👍, 0💬

💬 2023-12-13 kamalesh: thank you

Explain the scope resolution operator.
Explain the scope resolution operator. It permits a program to reference an identifier in the global scope that has been hidden by another identifier with the same name in the local scope. 2012-03-13, 3648👍, 0💬

What is the difference between char a[] = “string”; and char *p = “string”; ?
What is the difference between char a[] = “string”; and char *p = “string”; ? Answer1 a[] = “string”; char *p = “string”; The difference is this: p is pointing to a constant string, you can never safely say p[3]=’x'; however you can always say a[3]=’x'; char a[]=”string”; - character array init... 2012-03-08, 2866👍, 0💬

What can I safely assume about the initial values of variables which are not explicitly initialized?
What can I safely assume about the initial values of variables which are not explicitly initialized? It depends on complier which may assign any garbage value to a variable if it is not initialized. 2012-03-07, 2817👍, 0💬

How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters?
How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters? Answer1 If you want the code to be even slightly readable, you will use typedefs. typedef char* (*functiontype_one)(void); typedef functiontype_one (*functiontype_two)(void); functi... 2012-03-09, 2745👍, 0💬

What is the difference between char a[] = “string”; and char *p = “string”;?
What is the difference between char a[] = “string”; and char *p = “string”;? In the first case 6 bytes are allocated to the variable a which is fixed, where as in the second case if *p is assigned to some other value the allocate memory can change. 2012-03-07, 2649👍, 0💬

How do you link a C++ program to C functions?
How do you link a C++ program to C functions? By using the extern "C" linkage specification around the C function declarations. 2012-03-12, 2607👍, 0💬

What are the differences between a C++ struct and C++ class?
What are the differences between a C++ struct and C++ class? The default member and base-class access specifiers are different. 2012-03-13, 2599👍, 0💬

What does extern mean in a function declaration?
What does extern mean in a function declaration? It tells the compiler that a variable or a function exists, even if the compiler hasn’t yet seen it in the file currently being compiled. This variable or function may be defined in another file or further down in the current file. 2012-03-09, 2532👍, 0💬

How do I initialize a pointer to a function?
How do I initialize a pointer to a function? This is the way to initialize a pointer to a function void fun(int a) { } void main() { void (*fp)(int); fp=fun; fp(1); } 2012-03-12, 2526👍, 0💬

.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML

Home Hot About Collections Index RSS Atom Ask

Tester Developer DBA Windows JAR DLL Files Certificates RegEx Links Q&A Biotech Phones Travel FAQ Forum

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.