C++ Manipulator showpos

C++ manipulator showpos function is used to set the showpos format flag for the str stream.

When we set showpos format flag, then it enables the display of the '+' sign in non-negative integer (including zero) output. Has no effect on input.

Syntax

Parameter

str: stream object whose format flag is affected.

Return value

It returns argument str.

Data Races

Data races may cause when modified str concurrent accesses to the same stream object.

Exceptions

str is in a valid state, if an exception is thrown.

Example 1

Let's see the simple example to demonstrate the use of showpos:

#include <iostream>
using namespace std;

int main () {
   int p = 1;
   int z = 0;
   int n = -1;
   cout << showpos   << p << '\t' << z << '\t' << n << '\n';
   cout << noshowpos << p << '\t' << z << '\t' << n << '\n';
   return 0;
}

Output:

+1	+0	-1
 1	 0	-1

Example 2

Let's see another simple example:

// modify showpos flag
#include <iostream>
using namespace std;

int main () {
  int n;
  n=75;
  cout << showpos << n << endl;
  cout << noshowpos << n << endl;
  return 0;
}

Output:

+75
75

Example 3

Let's see another simple example:

// modify showpos flag
#include <iostream>
using namespace std;

int main () {
  int n;
  cout<<"Enter Number: ";
  cin>>n;
  cout << showpos << n << endl;
  cout << noshowpos << n << endl;
  return 0;
}

Output: