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

Input number N such that 1/N will return the output generated as decimal specified till the limit.

It is easy with Floating Point numbers but the challenge is without using them.

Input − n=5 k=5
Output − 20000
It means if n=5 and k=5 than after dividing 1/5 the output should be displayed till 5 decimal points.


Step 1 -> Declare int variable n to 9 and k to 7 and remain to 1 and i
Step 2-> Loop for i to 0 and i<k and i++
   Print ((10*remain)/n)
   Remain = (10*remain)%n
Step 3-> end Loop For


int main() {
   int n = 9, k = 7, remain=1,i ; // taking n for 1/n and k for decimal values
   printf("first %d digits of %d are : ",k,n);
   for(i=0;i<k;i++) {
      printf("%d",((10 * remain) / n));
      remain = (10*remain) % n;
   return 0;


If we run above program then it will generate following output.

first 7 digits of 9 are : 1111111

Updated on: 08-Aug-2019


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