The usage of standard C functions
Normal C functions, e.g., which are compiled and collected in a run-time library, can also be used in C++ programs. Such functions however must be declared as C functions. As an example, the following code fragment declares a function xmalloc() which is a C function:
extern "C" void *xmalloc(unsigned [...]

OpenAsthra introducing c, c++, programming, os, data structures quizzes
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Given an example, if the signed integer number is more than 255 then set the number to 255(clipping). On the other hand, if the signed integer is less than 0, then set the number to 0(clamping). This is implemented in C using ‘if condition’, which looks like the below code
int ClipNClamp(int val)
{
if(val < 0) [...]