# Answer to Question #22373 in C++ for emmanuel

Question #22373

program to find the sum of 1st 10 prime numbers.

Expert's answer

#include<iostream>

#include<math.h>

using namespace std;

int isPrime(unsigned int p)

{

if (p<2)return false; // 0 and 1 are not prime

if (p==2)return true; // 2 is a prime

floats=sqrt(p);

for(unsignedint i=2; i<=s; i++)

{

// if p isdivisible by i, then it is not prime

if (p % i== 0) return false;

}

// p is notdivisible by any number from 2 to sqrt(p), so it is prime

return true;

}

int main()

{

unsigned intn=10; // number of primes

unsigned intsum=0; // sum of primes

unsigned intp=2;

for(unsignedint i=0; i<n; i++)

{

// look forthe next prime

while(!isPrime(p)) {p++;};

// cout<< p << endl;

sum+=p;

p++;

}

cout <<"Sum of first " << n << " primes is " <<

sum << endl;

return 0;

}

#include<math.h>

using namespace std;

int isPrime(unsigned int p)

{

if (p<2)return false; // 0 and 1 are not prime

if (p==2)return true; // 2 is a prime

floats=sqrt(p);

for(unsignedint i=2; i<=s; i++)

{

// if p isdivisible by i, then it is not prime

if (p % i== 0) return false;

}

// p is notdivisible by any number from 2 to sqrt(p), so it is prime

return true;

}

int main()

{

unsigned intn=10; // number of primes

unsigned intsum=0; // sum of primes

unsigned intp=2;

for(unsignedint i=0; i<n; i++)

{

// look forthe next prime

while(!isPrime(p)) {p++;};

// cout<< p << endl;

sum+=p;

p++;

}

cout <<"Sum of first " << n << " primes is " <<

sum << endl;

return 0;

}

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