Function to copy string (Iterative and Recursive)
Given two strings, copy one string to other using recursion. We basically need to write our own recursive version of strcpy in C/C++
Examples:
Input : s1 = "hello"
s2 = "geeksforgeeks"
Output : s2 = "hello"
Input : s1 = "geeksforgeeks"
s2 = ""
Output : s2 = "geeksforgeeks"
Iterative :
Copy every character from s1 to s2 starting from index = 0 and in each call increase the index by 1 until s1 doesn’t reach to end;
// Iterative CPP Program to copy one String // to another. #include <bits/stdc++.h> using namespace std; // Function to copy one string to other // assuming that other string has enough // space. void myCopy(char s1[], char s2[]) { int i = 0; for (i=0; s1[i] != '\0'; i++) s2[i] = s1[i]; s2[i] = '\0'; } // Driver function int main() { char s1[100] = "GEEKSFORGEEKS"; char s2[100] = ""; myCopy(s1, s2); cout << s2; return 0; } |
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Output:
GEEKSFORGEEKS
Recursive :
Copy every character from s1 to s2 starting from index = 0 and in each call increase the index by 1 until s1 doesn’t reach to end;
// CPP Program to copy one String to // another using Recursion #include <bits/stdc++.h> using namespace std; // Function to copy one string in to other // using recursion void myCopy(char s1[], char s2[], int index = 0) { // copying each character from s1 to s2 s2[index] = s1[index]; // if string reach to end then stop if (s1[index] == '\0') return; // increase character index by one myCopy(s1, s2, index + 1); } // Driver function int main() { char s1[100] = "GEEKSFORGEEKS"; char s2[100] = ""; myCopy(s1, s2); cout << s2; return 0; } |
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Output:
GEEKSFORGEEKS
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