behaviour of malloc(0)

Question

int main()
{
    char *p;
    p = (char* ) malloc(sizeof(char) * 0);
    printf(\"Hello Enter the data without spaces :\\n\");
    scanf(\"%s\",p);
    printf(\"The          


        

Answer 1

It is implementation defined what malloc() will return but it is undefined behavior to use that pointer. And Undefined behavior means that anything can happen literally from program working without glitch to a crash, all safe bets are off.

C99 Standard:

7.22.3 Memory management functions
Para 1:

If the size of the space requested is zero, the behavior is implementation-defined: either a null pointer is returned, or the behavior is as if the size were some nonzero value, except that the returned pointer shall not be used to access an object.