C Exercises: Count the digits of a given number
C Recursion: Exercise-5 with Solution
Write a program in C to count the digits of a given number using recursion.
Pictorial Presentation:
Sample Solution:
C Code:
#include<stdio.h>
int noOfDigits(int n1);
int main()
{
int n1,ctr;
printf("\n\n count the digits of a given number :\n");
printf("-----------------------------------------\n");
printf(" Input a number : ");
scanf("%d",&n1);
ctr = noOfDigits(n1);
printf(" The number of digits in the number is : %d \n\n",ctr);
return 0;
}
int noOfDigits(int n1)
{
static int ctr=0;
if(n1!=0)
{
ctr++;
noOfDigits(n1/10);
}
return ctr;
}
Sample Output:
count the digits of a given number : ----------------------------------------- Input a number : 50 The number of digits in the number is : 2
Flowchart:
C Programming Code Editor:
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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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