C++ Program to compute division upto n decimal places

Given with the value of x and y as a positive integer with the value of n for number of decimal places and the task is to generate the division up to n decimal places.

Example

Input-: x = 36, y = 7, n = 5
Output-: 5.14285
Input-: x = 22, y = 7, n = 10
Output-: 3.1428571428

Approach used in the below program is as follows −

• Input the value of a, b and n
• Check if b is 0 than division will go upto infinite and if a is 0 than result will be 0 as something divides to 0 is 0
• If n is greater than 1 than store the value of remainder and subtract it from the dividend after that multiply the result by ten. Start the next iteration
• Print the result

ALGORITHM

START
Step 1-> declare function to compute division upto n decimal places
   void compute_division(int a, int b, int n)
   check IF (b == 0)
      print Infinite
   End
   check IF(a == 0)
      print 0
   End
   check IF(n <= 0)
      print a/b
   End
   check IF(((a > 0) && (b < 0)) || ((a < 0) && (b > 0)))
      print “-”
      set a = a > 0 ? a : -a
      set b = b > 0 ? b : -b
   End
   Declare and set int dec = a / b
   Loop For int i = 0 and i <= n and i++
      print dec
      Set a = a - (b * dec)
      IF(a == 0)
         break
      End
      Set a = a * 10
      set dec = a / b
      IF (i == 0)
         print “.”
      End
   End
Step 2-> In main()
   Declare and set int a = 36, b = 7, n = 5
   Call compute_division(a, b, n)
STOP

Example

#include <bits/stdc++.h>
using namespace std;
void compute_division(int a, int b, int n) {
    if (b == 0) {
        cout << "Infinite" << endl;
        return;
    }
    if (a == 0) {
        cout << 0 << endl;
        return;
    }
    if (n <= 0) {
        cout << a / b << endl;
        return;
    }
    if (((a > 0) && (b < 0)) || ((a < 0) && (b > 0))) {
        cout << "-";
        a = a > 0 ? a : -a;
        b = b > 0 ? b : -b;
    }
    int dec = a / b;
    for (int i = 0; i <= n; i++) {
        cout <<dec;
        a = a - (b * dec);
        if (a == 0)
            break;
        a = a * 10;
        dec = a / b;
        if (i == 0)
            cout << ".";
    }
}
int main() {
    int a = 36, b = 7, n = 5;
    compute_division(a, b, n);
    return 0;
}

Output

5.14285