Software Engineering __builtin_popcount and POPCNT We have explored about __builtin_popcount - a built-in function of GCC, which helps us to count the number of 1's(set bits) in an integer in C and C++. POPCNT is the assembly instruction used in __builtin_popcount.
C++ Static and extern pointers in C/ C++ Static and extern are storage classes in C which defines scope and life-time of a variable. Similar to any variables in C, we can use these keywords with pointers for different use cases.