练习题

    1.int i;

       for(i = 0; i < 5; i++)

           cout << i;

           cout << endl;

    这段代码将输出:

    01234

    2.int j;

       for(j = 0; j < 11; j += 3)

           cout << j;

       cout << endl << j << endl;

    这段代码将输出:

    0369

    12

    3.int j = 5;

       while(++j < 9)

           cout << j++ << endl;

    这段代码将输出:

    6

    8

    4.int k = 8;

       do

           cout << "k = " << k << endl;

       while(k++ < 5);

    这段代码将输出:

    k = 8;

    5.

#include <iostream>
#include <cstdio>
#include <string>
#include <array>
using namespace std;

int main()
{
    int result = 1;
    for (int i = 0; i < 7; i++)
    {
        cout << result << " ";
        result *= 2;
    }
}

       6.

#include <iostream>
#include <cstdio>
#include <string>
#include <array>
using namespace std;

int main()
{
    int a = 0;
    int b = 0;
    int total = 0;
    cout << "Enter a number:";
    cin >> a;
    cout << "Enter another number that larger than first one:";
    cin >> b;
    for (; a <= b; a++) {
        total += a;
    }
    cout << "The sum of integers between two numbers is:" << total << endl;
}

    7.

#include <iostream>
#include <cstdio>
#include <string>
#include <array>
using namespace std;

int main()
{
    int temp = 0;
    int sum = 0;
    cout << "Enter a number(Enter zero mean quit program):";
    cin >> temp;
    while (temp != 0) {
        sum += temp;
        cout << "Current sum is:" << sum << endl;
        cout << "Enter a number(Enter zero mean quit program):";
        cin >> temp;
    }
}