The standard library function calloc(n,size) returns a pointer to n objects of size size, with the storage initialized to zero. Write calloc, by calling malloc or by modifying it.
Return NULL if n * size is too big to represent. Use it in a program whose input lines each hold n and size. For each line: if n * size is at most 1,000,000, malloc that many bytes, fill them with 'x' and free them; then call calloc(n, size) and print the number of bytes in the result that aren't zero, or NULL if it returned NULL, and free it.
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