string-literals

I am trying to figure out how to write a macro that will pass both a string literal representation of a variable name along with the variable itself into a function. For example given the following function. void do_something(string name, int val) { cout << name << ": " << val << endl; } I would want to write a macro so I can do this: int my_val = 5; CALL_DO_SOMETHING(my_val); Which would print out: my_val: 5 I tried doing the following: #define CALL_DO_SOMETHING(VAR) do_something("VAR", VAR); However, as you might guess, the VAR inside the quotes doesn't get replaced, but is just passed as

In this statement: char *a = "string1" What exactly is string literal? Is it string1 ? Because this thread What is the type of string literals in C and C++? says something different. Up to my knowledge int main() { char *a = "string1"; //is a string- literals allocated memory in read-only section. char b[] = "string2"; //is a array char where memory will be allocated in stack. a[0] = 'X'; //Not allowed. It is an undefined Behaviour. For me, it Seg Faults. b[0] = 'Y'; //Valid. return 0; } Please add some details other than above mentioned points. Thanks. Debug Output Showing error in a[0] = 'Y'

#include "usefunc.h" //don't worry about this -> lib I wrote int main() { int i; string given[4000], longest = "a"; //declared new typdef. equivalent to 2D char array given[0] = "a"; printf("Please enter words separated by RETs...\n"); for (i = 1; i < 4000 && !StringEqual(given[i-1], "end"); i++) { given[i] = GetLine(); /* if (sizeof(given[i]) > sizeof(longest)) { longest = given[i]; } */ printf("%lu\n", sizeof(given[i])); //this ALWAYS RETURNS EIGHT!!! } printf("%s", longest); } Why does it always return 8??? There is no string data type in C. Is this C++? Or is string a typedef? Assuming

I was recently bitten by a subtle bug. char ** int2str = { "zero", // 0 "one", // 1 "two" // 2 "three",// 3 nullptr }; assert( int2str[1] == std::string("one") ); // passes assert( int2str[2] == std::string("two") ); // fails If you have godlike code review powers you'll notice I forgot the , after "two" . After the considerable effort to find that bug I've got to ask why would anyone ever want this behavior? I can see how this might be useful for macro magic, but then why is this a "feature" in a modern language like python? Have you ever used string literal concatenation in production code?

The following quote is from C++ Templates by Addison Wesley . Could someone please help me understand in plain English/layman's terms its gist? Because string literals are objects with internal linkage (two string literals with the same value but in different modules are different objects), you can't use them as template arguments either: GManNickG Your compiler ultimately operates on things called translation units , informally called source files . Within these translation units, you identify different entities: objects, functions, etc. The linkers job is to connect these units together, and