C++ :: Printing A String To A File?

these are the errors that I'm getting from an online c++ compiler

// main.cpp:4:10: error: #include expects "FILENAME" or
// main.cpp: In function 'void permute(char*, int)':
// main.cpp:17:9: error: 'f' was not declared in this scope

I don't understand how to print full_string to a file!// otherwise, I know that it gives the correct output -- 90 strings.

#include <string>
#include <iostream>
#include <fstream>
#include >ios> // line 4 error
using namespace std;
char full_string[] = "112233";

[code]....

//iter_swap – it just swaps the elements pointed to by the respective pointers without changing the pointers themselves. so, it's basically equivalent to the function:

void iter_swap(char *ptr1, char *ptr2) {
char tmp = *ptr1; *ptr1 = *ptr2;
*ptr2 = tmp;
}

// min_element – finds the location of the minimum element that exists in the given range. in this case,

it is the char* pointer pointing to the location of that element. it can be implemented like:

char *min_element(char *start, char *end) {
// end is 1 beyond the last valid element
if(start == end) return end; // empty range
char *min_pos = start;
for(char *iter = start+1; iter != end; ++iter)

[code]....