The `rename()` function in C++ renames a specified file. It takes two arguments:  
1. `oldname`
2. `newname` and returns an integer value. 

It renames a file in which a string points to an old name to a string pointed by a new name.



The syntax is as follows:
```c++
int rename(const char *oldname , const char *newname);
```

# Standard library
```c++
include<cstdio>
```
# Parameters
1. `oldname:` Points to the string containing the old name.

2. `newname:` Points to the string containing the new name.

# Code



#include <stdio.h>

int main() 
{
  char oldname[] = "old.txt";
  char newname[] = "new.txt";

  if ( rename ( oldname , newname) != 0 )
  {
    printf ("Error Renaming File!!!");
  }    
  else
  {
    printf("File Renamed Successfully");
  }   
  return 0;
}

How to use rename function in C

Rename function in C++ changes a file's name using two string arguments: oldname and newname.