Write a C++ program to find sum of first n prime numbers

Write a C++ program to find sum of first n prime numbers

In this article, we will discuss the concept of Write a C++ program to find sum of first n prime numbers

In this code, we are going to learn how to write to calculate sum of the first n prime numbers  using different methods in C++ program.

This is done using for loop,while loop and do-while loop  in C++ language.

Code to calculate sum of first n prime numbers

Code to calculate sum of first n prime numbers using for loop

In this program, we will calculate sum of the  first n  prime numbers using for loop in C++ language

Program 1

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j=2,n,counter=0,sum=0,flag=1;
    //the program ask to input maximum limit
    cout<<"Enter the value to n: ";
    cin>>n;
    //store the maximum in the max variable
while(counter<n){
    for(i=2; i<=j-1; i++){
            if(j%i==0){
                flag=0;
                break;
        }
    }
       // when the 'i' is prime then add to sum
       if(flag){
        sum+=j;
        counter++;
       }
       j++;
       flag=1;
    }
    cout<<"sum of first "<<n<<" prime numbers:"<<sum;
    getch();
    return 0;
}

When the above code is executed, it produces the following result

Enter the value to n:100
sum of first 100 prime numbers: 24133

 

Code to calculate sum of first n prime numbers using while loop

In this program, we will calculate sum of the  first n  prime numbers using while loop in C++ language

Program 1

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j=2,n,counter=0,sum=0,flag=1;
    //the program ask to input maximum limit
    cout<<"Enter the value to n: ";
    cin>>n;
    //store the maximum in the max variable
while(counter<n){
        i=2;
    while(i<=j-1){
            if(j%i==0){
                flag=0;
                break;
        }
 i++;
    }
       // when the 'i' is prime then add to sum
       if(flag){
        sum+=j;
        counter++;
       }
       j++;
       flag=1;
    }
    cout<<"sum of all first "<<n<<" prime numbers:"<<sum;
    getch();
    return 0;
}

When the above code is executed, it produces the following result

Enter the value to n:1000
sum of first 100 prime numbers: 3682913

 

Code to calculate sum of first n prime numbers using do-while loop

In this program, we will calculate sum of the  first n  prime numbers using do-while loop in C++ language

Program 1

#include <iostream>
#include <conio.h>
using namespace std;
int isPrime(int j){
int counter=0,i;
for(i=2; i<=j/2; i++){
            if(j%i==0){
                counter=1;
        }
}
if(counter==0)
    return 1;
else return 0;
}
int main(void)
{
    int n;
    cout<<"Enter value for n: \n";
    cin>>n;
    int i=0,j=1,sum=0;
    while(1){
        j++;
        if(isPrime(j)){
        sum+=j;
        i++;
       }
       if(i==n){
        break;
       }
    }
        cout<<"sum of all first "<<n<< "prime numbers:"<<sum;
getch();
    return 0;
}

When the above code is executed, it produces the following result

Enter the value to n:500
sum of first 500 prime numbers: 824693

 

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