what is the default return type of malloc?
267872
malloc returns void*, which is a generic pointer that can point to any type of data. The (char*) is an explicit type conversion, converting the pointer returned by malloc from a pointer to anything, to a pointer to char.
956064
Void simply means nothing. It doesn't take any parameters nor it returns anything. Return is use to give command back to the calling function and it returns value to Calling function.
1434509
5. How do you calculate the pointer difference in a memory efficient double linked list? Explanation: The pointer difference is calculated by taking XOR of pointer to previous node and pointer to the next node.
124691
There is no difference. You could type it as int * i if you wanted; they all mean the same thing: "i is a pointer to an int." It's the same thing. Some developers prefer the int* i notation because this way the type of i is clearly "pointer to an int" whereas int *i seems less readable.
1293144
C – Pointer Pointers in C language is a variable that stores/points the address of another variable. A Pointer in C is used to allocate memory dynamically i.e. at run time. The pointer variable might be belonging to any of the data type such as int, float, char, double, short etc.
1332634
Memory error: "munmap_chunk: invalid pointer" This happens when the pointer passed to (C-library language routine free(), which is called from Fortran routine NULLIFY()) is not valid or has been modified somehow.
1312634
But lots of C functions use a type called ssize_t . ... In short, ssize_t is the same as size_t , but is a signed type - read ssize_t as “signed size_t ”. ssize_t is able to represent the number -1 , which is returned by several system calls and library functions as a way to indicate error.
798852
The default return type for c language function is integer.so your fuction is taken by the compiler as returning and integer and about the void main() you cannot return a value form a function which is having a void type that's why you compiler is showing warning and is ignoring the return statement of your main.
209314
fgetc() is used to obtain input from a file single character at a time. ... It returns the character present at position indicated by file pointer. After reading the character, the file pointer is advanced to next character. If pointer is at end of file or if an error occurs EOF file is returned by this function.
1078221
char* strncpy( char* dest, const char* src, size_t count ); The strncpy() function takes three arguments: dest, src and count. It copies a maximum of count characters from the string pointed to by src to the memory location pointed to by dest .
1252287
Swift has a total of 8 pointer types. The basis is an immutable pointer UnsafePointer , and the corresponding variable pointer UnsafeMutablePointer . There is also an array can plug Buffer pointers and did not know what the content of the Raw pointer, that is not specified generics.
1249428
if we define return value of main function. then it will return that type of value. By default the main function return “0” because main function's default return type is “int”.
1211142
Where in memory are my variables stored in C? ... Variables declared and defined in main function -----> heap. Pointers (for example, char *arr , int *arr ) -------> heap. Dynamically allocated space (using malloc and calloc) --------> stack.
1063136
Neither C or C++ have a default built-in string type. C-strings are simply implemented as a char array which is terminated by a null character (aka 0 ). ... The standard library contains functions for processing C-strings, such as strlen , strcpy , and strcat .
91133
The function read(2) is usually implemented as a system call to the operating system kernel. ... This means that the internal read(2) from fgetc(3) wouldn't just read a single character, but rather it'll try to get more for the sake of efficiency.
1163551
A struct can be either passed/returned by value or passed/returned by reference (via a pointer) in C. The general consensus seems to be that the former can be applied to small structs without penalty in most cases.
725865
return statement is used to return a value from a function to the caller of that particular function. So, return 0, will return a value of 0 to the caller of the function. Whereas, getch() is an input statement. It reads a single character from the IO buffer and returns the value.