Read it backwards (as driven by Clockwise/Spiral Rule): int* – pointer to int int const * – pointer to const int int * const – const pointer to int int const * const – const pointer to const int Now the first const can be on either side of the type so: const int * == int const * const int * const == int const … Read more
Put an l (lowercased letter L) directly before the specifier.
Just put return 0 in your main(). Your function main returns an int (int main(void)) therefore you should add a return in the end of it. Control reaches the end of a non-void function warning: control reaches end of non-void function Solution: This warning is similar to the warning described in Return with no value. If control reaches … Read more
c_str returns a const char* that points to a null-terminated string (i.e. a C-style string). It is useful when you want to pass the “contents”¹ of an std::string to a function that expects to work with a C-style string. For example, consider this code: See it in action. Notes: ¹ This is not entirely true because an std::string (unlike a C string) … Read more
To quote the C++ standard, §3.9.1 ¶8: There are three floating point types: float, double, and long double. The type double provides at least as much precision as float, and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the … Read more
If you set LD_PRELOAD to the path of a shared object, that file will be loaded before any other library (including the C runtime, libc.so). So to run ls with your special malloc() implementation, do this:
It should be In C, simple quotes delimit a single character whereas double quotes are for strings.
You are seeing the ffffff because char is signed on your system. In C, vararg functions such as printf will promote all integers smaller than int to int. Since char is an integer (8-bit signed integer in your case), your chars are being promoted to int via sign-extension. Since c0 and 80 have a leading 1-bit (and are negative as an 8-bit integer), they are being sign-extended while the others in your … Read more
This error means that the linker is looking for a function named WinMain to use as the entry point. It would be doing that because you configured the project to target the GUI subsystem, but did not provide a WinMain function. My guess is that you want to produce a console application and have provided a main function. Target the console … Read more
There’s no guarantee in the POSIX standard that sizeof(int) >= sizeof(ssize_t), nor the other way around. Typically ssize_t is larger than int, but the safe and portable option in C99 is to use intmax_t instead for the argument and the return value. The only guarantees you have wrt. the relationship between int and ssize_t are: int can store values of at least the range [-2^15 … … Read more