C++ to conver C ? pls

// C++ program to sort a stack using an 
// auxiliary stack. 
#include <bits/stdc++.h> 
using namespace std; 
  
// This function return the sorted stack 
stack<int> sortStack(stack<int> &input) 
{ 
    stack<int> tmpStack; 
  
    while (!input.empty()) 
    { 
        // pop out the first element 
        int tmp = input.top(); 
        input.pop(); 
  
        // while temporary stack is not empty and top 
        // of stack is greater than temp 
        while (!tmpStack.empty() && tmpStack.top() > tmp) 
        { 
            // pop from temporary stack and push 
            // it to the input stack 
            input.push(tmpStack.top()); 
            tmpStack.pop(); 
        } 
  
        // push temp in tempory of stack 
        tmpStack.push(tmp); 
    } 
  
    return tmpStack; 
} 
  
// main function 
int main() 
{ 
    stack<int> input; 
    input.push(34); 
    input.push(3); 
    input.push(31); 
    input.push(98); 
    input.push(92); 
    input.push(23); 
  
    // This is the temporary stack 
    stack<int> tmpStack = sortStack(input); 
    cout << "Sorted numbers are:\n"; 
  
    while (!tmpStack.empty()) 
    { 
        cout << tmpStack.top()<< " "; 
        tmpStack.pop(); 
    } 
}