Replacepi(((())))))

#1

i ddin’t get the line from 17 to 20…please explain me
#include
#include
using namespace std;

void replace(char *a, int i)
{
// base case
if (a[i] == ‘\0’ || a[i + 1] == ‘\0’)
{
return;
}

// recursive case
if (a[i] == 'p' && a[i + 1] == 'i')
{
    int j = i + 2;
    while (a[j] != '\0')
    {
        j++;
    }
    while (j >= i + 2)
    {
        a[j + 2] = a[j];
        j--;
    }

    // copy the pi
    a[i] = '3';
    a[i + 1] = '.';
    a[i + 2] = '1';
    a[i + 3] = '4';

    // ask the recursion to solve the samller string
    replace(a, i + 4);
}
else
{
    // ask the recursion to solve the smaller string
    replace(a, i + 1);
}

}

int main()
{
char a[100];
cin.getline(a, 100);

int n = strlen(a);

cout << a << endl;

replace(a, 0);

cout << a << endl;
return 0;

}

#2

hi @abhinavssr2003_eab0717682969e5c, it is for going till the end then shifting characters to make space first try writing the code using for loop then you’ll easily convert it to recursion

#3

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