C Exercises: Find the LCM of two numbers
C Recursion: Exercise-13 with Solution
Write a program in C to find the LCM of two numbers using recursion.
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
int lcmCalculate(int a, int b);
int main()
{
int n1, n2, lcmOf;
printf("\n\n Recursion : Find the LCM of two numbers :\n");
printf("----------------------------------------------\n");
printf(" Input 1st number for LCM : ");
scanf("%d", &n1);
printf(" Input 2nd number for LCM : ");
scanf("%d", &n2);
// Ensures that first parameter of lcm must be smaller than 2nd
if(n1 > n2)
lcmOf = lcmCalculate(n2, n1);//call the function lcmCalculate for lcm calculation
else
lcmOf = lcmCalculate(n1, n2);//call the function lcmCalculate for lcm calculation
printf(" The LCM of %d and %d : %d\n\n", n1, n2, lcmOf);
return 0;
}
int lcmCalculate(int a, int b)//the value of n1 and n2 is passing through a and b
{
static int m = 0;
//Increments m by adding max value to it
m += b;
// If found a common multiple then return the m.
if((m % a == 0) && (m % b == 0))
{
return m;
}
else
{
lcmCalculate(a, b);//calling the function lcmCalculate itself
}
}
Sample Output:
Recursion : Find the LCM of two numbers : ---------------------------------------------- Input 1st number for LCM : 4 Input 2nd number for LCM : 6 The LCM of 4 and 6 : 12
Flowchart:
C Programming Code Editor:
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Previous: Write a program in C to check a number is a prime number or not using recursion.
Next: Write a program in C to print even or odd numbers in given range using recursion.
C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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