This C++ program prints all prime numbers between 1 and 200. It uses a nested for and while loop to check each number for primality by testing for divisibility against all numbers from 2 to the number itself. After printing 10 prime numbers, it prints a new line. Finally, it prints the total number of prime numbers found.

1. #include <iostream>
#include <cstdlib>
#include <math.h>
int main(){
system C"color f1");
int B=2;
int C=2;
int D=0;
int I=0;
int E=200;
cout<<"....................Numeros Primos........................nnn";
cout<<"Numeros Primos entre 1 y 200: nn";
scanf("%d",&E);
for(B;B<=E;B++){
C=2;
while((C<=B) && (B%C!=0)){
C++;}
if(B==C){printf("%6d",C); D++; I++; if(D==10){printf("n");D=0;}}
}
printf("nTotaL D NuMeRoS pRiMoS eS D: %dn",I);

2. system("PAUSE");
return 0;
}
#include <iostream>
#include <stdlib.h>
using namespace std;
int main(){
int n,suma=0;
cout<<"Ingrese N: ";
cin>>n;
if(n<2)
cout<<"Error.n";
else {for(int i=2;i<=n;i+=2)
suma+=i;
cout<<"La suma es: "<<suma<<endl;}
system("pause");
return 0;}