Print first k digits of 1/n where n is a positive integer

Given a positive integer n, print first k digits after point in value of 1/n. Your program should avoid overflow and floating point arithmetic.
Examples : 
 

Input: n = 3, k = 3
Output: 333

Input: n = 50, k = 4
Output: 0200

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Let us consider an example n = 7, k = 3. The first digit of 1/7 is '1', it can be obtained by doing integer value of 10/7. Remainder of 10/7 is 3. Next digit is 4 which can be obtained by taking integer value of 30/7. Remainder of 30/7 is 2. Next digits is 2 which can be obtained by taking integer value of 20/7 
 

Output : 

142
0476

Time Complexity: O(k)

Auxiliary Space: O(1)

Reference: 
Algorithms And Programming: Problems And Solutions by Alexander Shen