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calloc initializes memory allocated with 0 bytes but malloc does not

The signatures are different, but the main difference is zeroing the allocated memory.

yes ur answers r correct

There is one more difference which very few people know which is - Calloc returns the contiguous block of memory allocated on heap whereas for Malloc it is not the case.

-- Difference between malloc and calloc
    -- Signatures are different
    -- Malloc(s);
        -- Allocates byte of memory
        -- Returns a pointer for enough storage for an object of s bytes

    -- Calloc(n,s);
        -- Allocates block of memory
        -- Returns a pointer for enough contiguous storage for n objects, each of s bytes
        -- The storage is all initialized to zeros
        -- Calloc(m, n) is essentially equivalent to
                p = malloc(m * n);
                memset(p, 0, m * n);

Malloc returns contiguous block of memory..where as calloc returns memory of equal size blocks in non-contiguous locations..
see the link hxxp://onlamp.com/pub/a/onlamp/2005/10/27/memory-management.html

Besides the difference above, calloc is more resource demanding than malloc since it is going to explicitly set all the memory blocks returned to 0.