In this program, You will learn how to find the sum of prime numbers between 1 to n in C++.

```
10th: 2 + 3 + 5 + 7 = 17
```

```
#include<iostream>
using namespace std;
int main() {
int upto, i, j, p, s = 0;
cout << "Enter a number:";
cin>>upto;
for (i = 2; i <= upto; i++) {
p = 1;
j = 2;
while (j < i) {
if (i % j == 0) {
p = 0;
break;
}
j++;
}
if (p == 1) {
s = s + j;
}
}
cout << "Sum of prime numbers:" << s;
return 0;
}
```

```
Enter a number:10
Sum of prime numbers:17
```