ios setstate() function in C++ with Examples

The setstate() method of ios class in C++ is used to change the current state of this stream by setting the flags passed as the parameters. Hence this function changes the internal state of this stream.

Syntax:

void setstate(iostate state)

Parameters: This method accepts the iostate as parameter which is the combination of goodbit, failbit, eofbit and badbit flags to be set in this stream.



Return Value: This method do not return anything.

Example 1:

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// C++ code to demonstrate
// the working of setstate() function
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // Stream 1
    stringstream ss;
    ss.clear(ss.goodbit);
  
    // Stream 2
    stringstream ss2;
    cout << "current stream: " << ss2.rdstate() << endl;
  
    // Using setstate() function
    ss2.setstate(ss.rdstate());
  
    // Print the result
    cout << "updated stream: " << ss2.rdstate() << endl;
  
    return 0;
}

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Output:

current stream: 0
updated stream: 0

Example 2:

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// C++ code to demonstrate
// the working of setstate() function
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // Stream 1
    stringstream ss;
    ss.clear(ss.failbit);
  
    // Stream 2
    stringstream ss2;
    cout << "current stream: " << ss2.rdstate() << endl;
  
    // Using setstate() function
    ss2.setstate(ss.rdstate());
  
    // Print the result
    cout << "updated stream: " << ss2.rdstate() << endl;
  
    return 0;
}

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Output:

current stream: 0
updated stream: 4

Reference: hhttp://www.cplusplus.com/reference/ios/ios/setstate/



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