Program To Find HCF In C

An H.C.F or Highest Common Factor, is the largest common factor of two or more values.

For example factors of 12 and 16 are −

12 → 1, 2, 3, 4, 6, 12

16 → 1, 2, 4, 8, 16

The common factors are 1, 2, 4 and the highest common factor is 4.

Algorithm

Algorithm of this program can be derived as −

START
   Step 1 → Define two variables - A, B
   Step 2 → Set loop from 1 to max of A, B
   Step 3 → Check if both are completely divided by same loop number, if yes, store it
   Step 4 → Display the stored number is HCF
STOP

Pseudocode

procedure even_odd()

   Define two variables a and b
   FOR i = 1 TO MAX(a, b) DO
      IF a % i is 0 AND b % i is 0 THEN
         HCF = i
      ENDIF
   ENDFOR
   DISPLAY HCF

end procedure

Implementation

Implementation of this algorithm is given below −

#include<stdio.h>

int main() {
   int a, b, i, hcf;

   a = 12;
   b = 16;

   for(i = 1; i <= a || i <= b; i++) {
   if( a%i == 0 && b%i == 0 )
      hcf = i;
   }

   printf("HCF = %d", hcf);
   
   return 0;
}

Output

Output of the program should be −

HCF = 4