Integration lab 07

#include<bits/stdc++.h>
#include<cmath>
using namespace std;
class inte{
    public:
    double func(double x);
    double calculate(double a,double b,double n);
};
double inte::func(double x){
    return (sqrt(1-(x*x)));
}
double inte::calculate(double a,double b,double n){
    double delx=(b-a)/n;
    double x=a,sum=0;
    int i;
    for(i=1;i<n;i++){
        sum+=(2*func(x));
        x+=delx;
    }
    sum+=(func(x+delx));
    sum*=0.5*delx;
    return sum;
}
int main(){
    inte ob;
    double resultprevious,resultcurrent;
    int n=5;
    int flug=1;
    resultprevious=ob.calculate(0,1,n);
    resultcurrent=ob.calculate(0,1,n+5);
    do{
        cout<<" n is "<<n<<" result is "<<resultprevious<<endl;
        if((abs(resultprevious-resultcurrent))<0.00001){
            flug=0;
            cout<<" n is "<<n+5<<" result is "<<resultcurrent<<endl;
            }
        else{
            n+=5;
            resultprevious=resultcurrent;
            resultcurrent=ob.calculate(0,1,n);
        }
    }while(flug);
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
class inte{
    public:
    double func(double x);
    double calculate(double a,double b,double n);
};
double inte::func(double x){
    return (sqrt(1-(x*x)));
}
double inte::calculate(double a,double b,double n){
    double delx=(b-a)/n;
    double x=a,sum=0;
    int i;
    for(i=1;i<n;i++){
        sum+=(2*func(x));
        x+=delx;
        cout<<" x is "<<x<<" sum is "<<sum<<endl;
    }
    sum+=(func(x+delx));
    sum*=0.5*delx;
    return sum;
}
int main(){
    inte ob;
    double result=ob.calculate(0,1,5);
    cout<<endl<<"result is "<<result<<endl;
    return 0;
}





#include<bits/stdc++.h>
#include<cmath>
using namespace std;
class inte{
    public:
    double func(double x);
    double calculate(double a,double b,double n);
};
double inte::func(double x){
    return (sqrt(1-(x*x)));
}
double inte::calculate(double a,double b,double n){
    double delx=(b-a)/n;
    double x=a,sum=0;
    int i;
    for(i=1;i<n;i++){
        sum+=(2*func(x));
        x+=delx;
    }
    sum+=(func(x+delx));
    sum*=0.5*delx;
    return sum;
}
int main(){
    inte ob;
    double resultprevious,resultcurrent;
    int n=5;
    int flug=1;
    resultprevious=ob.calculate(0,1,n);
    resultcurrent=ob.calculate(0,1,n+5);
    do{
        cout<<" n is "<<n<<" result is "<<resultprevious<<endl;
        if((abs(resultprevious-resultcurrent))<0.00001){
            flug=0;
            cout<<" n is "<<n+5<<" result is "<<resultcurrent<<endl;
            }
        else{
            n+=5;
            resultprevious=resultcurrent;
            resultcurrent=ob.calculate(0,1,n);
        }
    }while(flug);
    return 0;
}