12. C++ program to find largest among 'n' numbers.

#include <iostream>
int main()
{
int i,n,m; 
cout <<"Enter the total number \n";
cin >>n;
cout <<"The total number of array is \n"<<n;
for(i=1;i<=n;i++)
cin >>a[i];
cout <<"The entered array is \n";
for(i=1;i<=n;i++)
cout <<"\n"<<a[i];
m = a[1];
for(i=2;i<=n;i++)
{
if(m<a[i])
m = a[i];
}
cout <<"The largest number is \n"<< m;
return 0;
}

11. C++ program to find sum of 'n' numbers.

#include <iostream>
int main()
{
int i,n,sum;
cout <<"Enter the total number \n";
cin >>n;
cout <<"The total number of array is \n"<<n;
for(i=1;i<=n;i++)
cin >>a[i];
sum=0;
cout <<"the array is \n";
for(i=1;i<=n;i++)
cout <<"\n"<<a[i];
for(i=1;i<=n;i++)
sum=sum+a[i];
cout <<"The sum of 'n' number is \n"<< sum;
return 0;
}

10. C++ program to find average of "n" numbers.

#include <iostream>
int main()
{
int i,n,m;
cout <<"Enter the total numbers \n";
cin >>n;
cout <<"The total number of array is \n"<<n;
for(i=1;i<=n;i++)
cin >>a[i];
m=0;
cout <<"The entered array is \n";
for(i=1;i<=n;i++)
cout <<"\n"<<a[i];
for(i=1;i<=n;i++)
m = m + a[i];
m = m / n;
cout <<" The average of 'n' numbers is \n"<< m;
return 0;
}

9. C++ program to find if the given number is even or odd.

#include <iostream>
int main()
{
int p,q;
cout <<"enter the number \n";
cin >>p;
cout <<"the given number is \n"<<n;
q=p%2;
if(q==0)
cout << p<<" is even number \n";
else
cout <<p<<" is odd number \n";
return 0;
}

8. C++ program to find the given number is palindrome or not.

#include <iostream>
int main()
{
int n,m,p,q;
cout <<"Enter the number\n";
cin >>n;
cout << "Entered number is \n"<<n;
m=n;
p=0;
do
{
q=n%10;
n=n/10;
p=p*10+q;
} while(n!=0);
if(p==m)
cout <<"The given number is palindrome \n"<<m;
else
cout <<"The given number is not palindrome \n"<<m;
return 0;
}

7. C++ program to find prime number.

#include <iostream>
int main()
{
int l, i, j, k;
clrscr();
l=0;
cin >>n;
for(i=1;i<=n;i++)
{
for(j=2;j<=(i-1);j++)
{
k=i%j;
if (k==0)
l=1;
else
l=l;
}
if (l==0)
cout <<"The number is prime \n"<<i;
else
cout <<"This is not a prime number \n"<<i;
l=0;
}
return 0;
}

6. C++ program to find Armstrong number

#include <iostream>
int main()
{
int s, n, m, r;
cout <<"Enter the number \n";
cin >>n;
cout <<" Entered number is \n"<< n;
s=0;
m=n;
do
{
r=n%10;
n=n/10;
s=s+r*r*r;
}while (n!=0);
if(s==m)
cout <<"This is Armstrong number\n";
else
cout <<"This is not Armstrong number\n";
return 0;
}