Reverse a string in place. : char array « Data Types « C++ Tutorial

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C++ Tutorial » Data Types » char array

2.20.7.Reverse a string in place.

#include <iostream> 

#include <cstring> 

using namespace std; 

 

int main() 

{ 

  char str[] = "this is a test"; 

  char *start, *end; 

  int len; 

  char t; 

 

  cout << "Original: " << str << "\n"; 

   

  len = strlen(str); 

 

  start = str; 

  end = &str[len-1]; 

 

  while(start < end) { 

    // swap chars 

    t = *start; 

    *start = *end; 

    *end = t; 

 

    // advance pointers 

    start++; 

    end--; 

  } 

 

 

  cout << "Reversed: " << str << "\n"; 

  return 0; 

}

Original: this is a test
Reversed: tset a si siht

2.20.char array
	2.20.1.	char array buffers
	2.20.2.	initialized string
	2.20.3.	Treating character arrays as strings.
	2.20.4.	Get line with buffer size for char array reading
	2.20.5.	Use cin.get() to read a string based on char array
	2.20.6.	Reverse case using array indexing.
	2.20.7.	Reverse a string in place.
	2.20.8.	Copying a string using array notation
	2.20.9.	Copying a string using pointer notation
	2.20.10.	Initializing char pointers with strings
	2.20.11.	Using an array of pointers to char
	2.20.12.	simple string variable
	2.20.13.	reads multiple lines, terminates on '$' character
	2.20.14.	reads string with embedded blanks
	2.20.15.	Read from keyboard and output char array
	2.20.16.	multidimensional char arrays

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