c++ - How to create a function which randomly jumbles a string -

my main function contains string jumble. have found piece of code passes in char* , returns 0 when complete. have followed code providers instructions pass in string have jumbled.

#include <iostream> #include <string.h> #include <time.h> using namespace std;  int scramblestring(char* str) {      int x = strlen(str);      srand(time(null));      for(int y = x; y >=0; y--)      {           swap(str[rand()%x],str[y-1]);      }      return 0; } 

when this, recieve error "no suitable conversion function "std::string" "char*" exists.

i have tried passing in const char* won't allow me access word , change it.

why mixing std::string char*? should operate directly on string:

void scramblestring(std::string& str)  {     int x = str.length();     for(int y = x; y > 0; y--)      {          int pos = rand()%x;         char tmp = str[y-1];         str[y-1] = str[pos];         str[pos] = tmp;     } } 

usage becomes:

    std::string value = "this test";     scramblestring(value); 

that being said, std::random_shuffle you...