constants, manipulators and operator precedence in c++

 #include<iostream>

#include<iomanip>
using namespace std;

int main (){

    // int a=5;
    // cout<<"the value of a was "<<a<<endl;
    // a=7;
    // cout<<"the value of a is "<<a<<endl;
    //here the value of a changed from 5 to 7

    //constants in c++ (to not let change the value of a we use constants)
   
    // const int a=5;
  • The const variable cannot be left un-initialized at the time of the declaration.
    // cout<<"the value of a was "<<a<<endl;
    // a=7;
    // cout<<"the value of a is "<<a<<endl;
    //here it will show an error because a is a constant

    //manipulators in c++
    //manipulators vo operators hote h jo data display ki formatting m help krte h for ex:endl

    int a=5, b=57, c=5757;
    cout<<"the value of a without setw is "<<a<<endl;
    cout<<"the value of b without setw is "<<b<<endl;
    cout<<"the value of c without setw is "<<c<<endl;
//setw comes from iomanip file
    cout<<"the value of a is "<<setw(4)<<a<<endl;
    cout<<"the value of b is "<<setw(4)<<b<<endl;
    cout<<"the value of c is "<<setw(4)<<c<<endl;
    //setw kitna space chodhna usme kaam ata h

    //operator precedence in c++

    int k=3;
    int s=2;
    // int ks=k*5+s; //yaha bodmas ka use nhi operator precedence ka use hoga check on en.cppreference sit
    int ks=(((k*5+s)-59)+393);//ab + aur - m operator precidency same h to hum associativity dekhenge which is from left to right. mtlb left se right evaluate hoga
    cout<<ks<<endl;//perecedence ka mtlb h sbse pehle konsa operator use hoga
    //yaha multiply pehle hoga coz opertor precendence m vo pehle ata
    return 0;
}

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