Reverse a String

 You are given a string s. You need to reverse the string.


Reverse a String




Example 1:

Input:

s = codemummy

Output: ymmumedoc


Example 2:

Input:

s = for

Output: rof



method 1:

reverse by swapping the characters

implementation in c++:

void reverseStr(string& str) 
{ 
    int n = str.length(); 
  
    // Swap character starting from two 
    // corners 
    for (int i = 0; i < n / 2; i++) 
        swap(str[i], str[n - i - 1]); 
}





method 2:

Using inbuilt “reverse” function:

implementation in c++:

int main() 
{ 
    string str = "geeksforgeeks"; 
  
    // Reverse str[begin..end] 
    reverse(str.begin(), str.end()); 
  
    cout << str; 
    return 0; 
} 





method 3:
printing characters from the end one by one till we reach the start

implementation in c++:

int main() 
{ 
    string str = "geeksforgeeks"; 
  
    // Reverse str[begin..end] 
    reverse(str.begin(), str.end()); 
  
    cout << str; 
    return 0; 
} 




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