Convert a number to a char then convert to upper case and lower case

  
#include <iostream>
using namespace std;
int main()
{
  char a,u,l;
  int x;
  cout << "Please enter a number \n";
  cin >> a;
  x = atoi(&a);
  cout << "The character " << a << " is converted to the integer " << x << "\n";
  cout << "Please enter a character \n";
  cin >> a;
  u = toupper(a);
  l = tolower(a);
 
  cout << a << " in upper case is " << u << " in lower case is " << l;

  return 0;
}

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Convert a number to a char then convert to upper case and lower case : Char « Data Type « C++

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