The following C program using recursion finds the HCF of two entered integers. The HCF stands for Highest Common Factor.
Here is the source code of the C program to find HCF of two numbers. The C program is successfully compiled and run on a Linux system. The program output is also shown below.
* C Program to find HCF of a given Number using Recursion
int hcf(int, int);
int a, b, result;
printf("Enter the two numbers to find their HCF: ");
scanf("%d%d", &a, &b);
result = hcf(a, b);
printf("The HCF of %d and %d is %d.\n", a, b, result);
int hcf(int a, int b)
while (a != b)
if (a > b)
return hcf(a - b, b);
return hcf(a, b - a);
$ cc pgm32.c $ a.out Enter the two numbers to find their HCF: 24 36 The HCF of 24 and 36 is 12.
Sanfoundry Global Education & Learning Series – 1000 C Programs.