C++ bitset set() Function

C++ bitset set() function is used to set all the bits to 1. If only a single parameter is passed, it sets the bit at that particular index to 1.

Syntax

set(int index, bool Val);
set();

Parameter

index: This parameter specifies the position at which the bit has to be set. The parameter is an optional one.

val: this parameter specifies a boolean value which has to bet set at the index. The parameter is an optional one.

Return value

It does not return any value.

Example 1

#include <iostream>
#include <bitset>
using namespace std;
int main()
{
bitset<4> b(string("1001"));
cout<< "before applying set method : " << b <<'\n';
cout<< "after applying reset method : " <<b.set() <<'\n';
return 0;
}

Output:

before applying set method : 1001
after applying reset method : 1111

Example 2

#include <iostream>
#include <bitset>
using namespace std;
int main()
{
// Initialization of bitset
bitset<4> b1(string("1100"));
bitset<6> b2(string("100100"));
// Function that resets all bits
cout<< "Before applying set() function: "<< b1 <<endl;
// single parameter is passed
b1.set(1);
cout<< "After applying set(1) function: "
<< b1 <<endl;

// Function that resets all bits
cout<< "Before applying set() function: "
<< b2 <<endl;
 // both parameters is passed
b2.set(2, 0);
b2.set(4, 1);
cout<< "After applying set(2, 0) and"
<<" set(4, 1) function: " << b2 <<endl;
return 0;
}

Output:

Before applying set() function: 1100
After applying set(1) function: 1110
Before applying set() function: 100100
After applying set(2, 0) and set(4, 1) function: 110000

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