what to do when malloc fails in c code example

Example 1: how to use malloc in c

int* a =(int*)malloc(sizeof(int))

Example 2: what is the use of malloc in c

In C, the library function malloc is used to allocate a block of memory on the heap. The program accesses this block of memory via a pointer that malloc returns. When the memory is no longer needed, the pointer is passed to free which deallocates the memory so that it can be used for other purposes.