There’s no single definitive answer to your question. Firstly, the external behavior of a freed block will depend on whether it was released to the system or stored as a free block in the internal memory pool of the process or C runtime library. In modern OSes the memory “returned to the system” will become …
cc -o yourprog yourprog.c -lstatic or cc -o yourprog yourprog.c libstatic.a
No. C++ builtin swap function: swap(first,second); Check this: http://www.cplusplus.com/reference/algorithm/swap/ You can use this to swap two variable value without using third variable: a=a^b; b=a^b; a=b^a; You can also check this: https://stackoverflow.com/questions/756750/swap-the-values-of-two-variables-without-using-third-variable How to swap without a third variable?
This happens because declaring variables inside a for loop wasn’t valid C until C99(which is the standard of C published in 1999), you can either declare your counter outside the for as pointed out by others or use the -std=c99 flag to tell the compiler explicitly that you’re using this standard and it should interpret …
The answer lies in the difference between declaration and definition. You are attempting to declare and define in the same step (in the case of a new type via typedef). You need to break these up into different steps so the compiler knows what you are talking about in advance. typedef struct Person Person; typedef …
If you just want to execute the shell command in your c program, you could use, #include <stdlib.h> int system(const char *command); In your case, system(“pwd”); The issue is that there isn’t an executable file called “pwd” and I’m unable to execute “echo $PWD”, since echo is also a built-in command with no executable to …
It’s important to distinguish between the file descriptor, which is a small integer that the process uses in its read and write calls to identify the file, and the file description, which is a structure in the kernel. The file offset is part of the file description. It lives in the kernel. As an example, …
Given your update with the error, check what you have on the line before those ${CC} commands. Many make programs require a real tab character before the commands and editors that put in eight spaces (for example) will break them. That’s more often than not the cause of the “Missing separator” errors. You can see …
The often referenced gcc documentation for always_inline is incomplete. always_inline attribute makes gcc compiler: Ignore -fno-inline (this is what the documentation says). Ignore the inlining limits hence inlining the function regardless. It also inlines functions with alloca calls, which inline keyword never does. Not produce an external definition of a function with external linkage if …
Multiply the value by a carefully designed 64-bit constant, then mask off the upper 4 bits. For any CPU with fast 64-bit multiplication, this is probably as optimal as you can get. int field_set(uint64_t input) { uint64_t field = input * 0x20406080a0c0e1ULL; return (field >> 60) & 15; } // field_set(0x0000000000000000ULL) = 0 // field_set(0x0000000000000080ULL) …