[isprint function determines whether characters can be output]

【isprint() Function to determine whether a character is printable .'  ' Space 】

#include <iostream>

#include <string.h>

using namespace std;

int main()

{

 string s = "12d1 2 ddsd";

 int d = 0;

 for (int i = 0; i<s.length(); i++)

 {

  if (s[i] != ' ' && isprint(s[i])) // Judge not to be a space And can output ;

  {

   s[d++] = s[i];

  }

 }

 cout << " The changed string is :" << endl;

 for (int i = 0; i < d; i++)

 {

  cout << s[i];

 }

}