malloc(size * sizeof(int));
时间: 2023-11-19 19:06:35 浏览: 50
This line of code is an example of dynamic memory allocation in C. It allocates memory for an array of integers with a size specified by the variable "size". The memory allocation is done using the malloc function, which stands for "memory allocation".
The malloc function takes a single argument, which is the number of bytes to allocate. In this case, we are allocating memory for "size" integers, so we multiply "size" by the size of an integer (which is typically 4 bytes on most modern systems) using the sizeof operator.
The result of the malloc function is a pointer to the first byte of the allocated memory block. In this case, we are casting that pointer to a pointer to an integer type, since we are allocating memory for an array of integers.
It's important to note that when using dynamic memory allocation, we need to explicitly free the memory when we are done using it, using the free function. Failure to do so can result in memory leaks, where memory is allocated but never released, leading to a gradual depletion of available memory over time.