Question

Write a recursive function count_digits that counts all the digits in a string.

Program: C

Answer 1

CODE:

#include <stdio.h>
char string[100];

int count_digits(char str[],int n)
{
static int count=0,i=0;
char c;
if(i!=n)
{
c=str[i++];
if(c>='0' && c<='9')
{
           count++;
   count_digits(string,n);
    }
else
   count_digits(string,n);
  
}
else
{
return count;
}
}
int main()
{
int count=0;
int i;
int strlen=0;
printf("Enter a string to find digits: ");
scanf("%s",string);
for(i=0;string[i]!='\0';i++)
{
   strlen=strlen+1;
   }
count=count_digits(string,strlen);

printf("Total digits is %d",count);

return 0;
}

OUTPUT:

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