Example 1

#include <iostream>
using namespace std;
int main(){
    int i, x[5];
    for(i=0;i<5;i++){
        cout << "Enter number " << i << ": ";
        cin >> x[i];
    }
    cout << "The values in the array are: " << endl;
    for(i=0;i<5;i++)
        cout << x[i] << "\t"; 
    cout << endl;
    return 0;
}


Example 2

#include <iostream>

using namespace std;

int main()
{
    int i, index, value;
    int x[5]={5, 4, 3, 2, 1};       
    do{
        cout << "Enter an index: ";
        cin >> index;
    }while(index<0||index>4);
    cout << "Enter a new value: ";
    cin >> value;         
    x[index]=value;
    cout << "The values in the array are: " << endl;
    for(i=0;i<5;i++)
        cout << x[i] << "\t";
    cout << endl;


    return 0;
}

Example 3

#include <iostream>

using namespace std;

int main()
{
    int i, temp, index1, index2;
    int x[5]={1,2,3,4,5};
    do{
        cout << "Enter Index of the first number: ";
        cin >> index1;
    }while(index1<0||index1>4);
    do{
        cout << "Enter Index of the second number: ";
        cin >> index2;
    }while(index2<0||index2>4);

    temp = x[index1];
    x[index1] = x[index2];
    x[index2] = temp;
    for(i=0;i<5;i++)
        cout << x[i] << "\t";
    cout << endl;

    return 0;
}


Example 4
#include <iostream>

using namespace std;

int main()
{
    int i, num, found=-1;
    int x[5]={9,21,12,7,5};
    cout << "Enter a number: ";
    cin >> num;

    i=0;
    while(i<5&&found==-1){
        if(x[i]==num)
                found=i;
        i++;
    }
    if(found!=-1)
        cout << "Number found" << endl;
    else
        cout << "Number not found" << endl;

    return 0;
}