//C++语言的if/else判断语句
#include
#include
using namespace std;
int main()
{
char user_ans;
cout << "现在正在下雨吗Y/N?" << endl;
cin >> user_ans;
if ('Y' == user_ans || 'y' == user_ans)
{
cout << "现在正在下雨" << endl;
}
else
{
cout << "现在没有下雨" << endl;
cout << "今天会有太阳吗?" << endl;
cin >> user_ans;
if ('Y' == user_ans || 'y' == user_ans)
{
cout << "今天是晴天" << endl;
}
else
cout << "今天是阴天" << endl;
}
system("pause");
}
#include
#include
#include
#include
using namespace std;
int main()
{
vectornumb;//使用vector
bool u_agg = true;
int cnt = 1;
int buffer;
float avg;
char u_ans;
while (u_agg)
{
cout << "第" << cnt << "个数字:\n";
cin >> buffer;
numb.push_back(buffer);//vector的push_back()
cout << "完成没有?Y/N\n";
cin >> u_ans;
if ('N' == u_ans || 'n' == u_ans)
{
cnt++;
continue;
}
else
{
u_agg = false;
}
}
for (int i = 0; i < numb.size() - 2; i++)//size()
//这段目的可看出来,输入相邻的两个数相加除以3
{
int sum = 0;
for (int j = i; j < i + 2; j++)
sum = sum + numb[j];
avg = float(sum) / 3;
cout << setiosflags(ios::fixed) << setprecision(2) << avg << " \n";
}
system("pause");
}
#include
using namespace std;
unsigned long int cnt(int n)//计算n的从0和n的每个数的 阶乘之和
{
unsigned long int sum = 0;
for (int i = 1; i<=n; i++)
{
unsigned long int mul = 1;
for (int j = 1; j <= i; j++)
mul *= j;
sum += mul;
}
return sum;
}
bool pass(int n)//判断输入的n是否在0和25之间
{
if (n >= 0 && n <= 25)
return true;
else
{
cout << "n must between 0 and 25!\n";
return false;
}
}
int main()
{
int n;
unsigned long int sum;
cout << "enter the number n:";
cin >> n;
while (pass(n))
{
sum = cnt(n);
cout << sum;
break;
}
system("pause");
}
#include//第一种图形
using namespace std;
int main()
{
int j = 0;
for (int i = 1; i <= 9; i++)
{
for (int k = 1; k <= i; k++)
if ((k + j) % 9)
cout << (k + j) % 9 << " ";
else
cout << 9 << " ";
cout << endl;
j = j + i;
}
system("pause");
}
#include//第二种图形
using namespace std;
int main()
{
int j = 0;
for (int i = 1; i <= 9; i++)
{
for (int m = 0; m < 9 - i; m++)
cout << " ";
for (int k = 0; k <= i; k++)
{
if ((k + j) % 9)
cout << (k + j) % 9 << " ";
else
cout << 9 << " ";
}
cout << endl;
j = j + i;
}
system("pause");
}
#include//第三种图
using namespace std;
int main()
{
int j = 0;
for (int i = 1; i <= 9; i++)
{
for (int k = 1; k <= 8; k++)
if ((k + j) % 9)
cout << (k + j) % 9 << " ";
else
cout << 9 << " ";
cout << endl;
j = j + 8;
}
system("pause");
}
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