計算機程式設計C++(第3周基礎練習)
阿新 • • 發佈:2018-11-19
計算機程式設計C++ MOOC
測試與作業C++基礎練習100題
##第三週基本練習
- 判斷奇偶數
#include "iostream" using namespace std; int main() { int a; cin >> a; if (a % 2 == 0) { cout << "even" << endl; } else { cout << "odd" << endl; } return 0; }
- 判斷數的型別
#include "iostream" using namespace std; int main() { double a; cin >> a; if (a>0&&int(a)!=a) { cout << "positive real" << endl; } else if (a>0&&int(a)==a) { cout << "positive integer" << endl; } else if (a<0 && int(a) != a) { cout << "negative real" << endl; } else if (a<0 && int(a) == a) { cout << "negative integer" << endl; } else if (a == 0) { cout << "zero" << endl; } return 0; }
- 判斷點的象限
#include "iostream" using namespace std; int main() { double a, b; cin >> a >> b; if (a > 0 && b > 0) { cout << "1" << endl; } else if (a > 0 && b < 0) { cout << "4" << endl; } else if (a < 0 && b>0) { cout << "2" << endl; } else if (a < 0 && b < 0) { cout << "3" << endl; } return 0; }
- 判斷字元型別
#include "iostream"
using namespace std;
int main()
{
char a;
cin >> a;
if (a >= '0'&&a <= '9')
{
cout << "0" << endl;
}
else if (a >= 'A'&&a <= 'Z')
{
cout << "1" << endl;
}
else if (a >= 'a'&&a <= 'z')
{
cout << "2" << endl;
}
else
{
cout << "-1" << endl;
}
return 0;
}
- 百分制成績轉五分製成績
#include "iostream"
using namespace std;
int main()
{
int grade;
cin >> grade;
switch (grade / 10)
{
case 10:
cout << "5" << endl;
break;
case 9:
cout << "5" << endl;
break;
case 8:
cout << "4" << endl;
break;
case 7:
cout << "3" << endl;
break;
case 6:
cout << "2" << endl;
break;
case 0:
cout << "0" << endl;
break;
default:
cout << "1" << endl;
}
return 0;
}
- 顯示n個字元
#include "iostream"
using namespace std;
int main()
{
int number,i;
char a;
cin >> number >> a;
for (i = 0; i < number; i++)
{
cout << a;
}
cout << endl;
return 0;
}
- 顯示字元組成的矩形
#include "iostream"
using namespace std;
int main()
{
int number1,number2,i,j;
char a;
cin >> number1>>number2 >> a;
for (i = 0; i < number1; i++)
{
for (j = 0; j < number2; j++)
{
cout << a;
}
cout << endl;
}
return 0;
}
- 用迴圈計算1+2+3+…+n
#include "iostream"
using namespace std;
int main()
{
int n, sum=0,i;
cin >> n;
i = 1;
while (i <= n)
{
sum = sum + i;
i++;
}
cout << sum << endl;
return 0;
}
- 計算1+1/2+1/3+…+1/n
#include "iostream"
using namespace std;
int main()
{
int n, i;
double sum = 0;
cin >> n;
if (n != 0)
{
for (i = 1; i <= n; i++)
{
sum = sum + 1.0 / i;
}
}
cout << sum << endl;
return 0;
}
- 計算n!
#include "iostream"
using namespace std;
int main()
{
int n, mul=1,i;
cin >> n;
if (n != 0)
{
for (i = 1; i <= n; i++)
{
mul = mul*i;
}
}
cout << mul << endl;
return 0;
}
- 交替輸出1和-1
#include "iostream"
using namespace std;
int main()
{
int n,i,a=1;
cin >> n;
cout << a;
for (i = 2; i <= n; i++)
{
a = a*-1;
cout << " " << a;
}
return 0;
}
- 判斷整數的位數
#include "iostream"
using namespace std;
int main()
{
int a, n = 1;
cin >> a;
a = a / 10;
while (a)
{
a = a / 10;
n++;
}
cout << n << endl;
return 0;
}
- 求非負整數的各位數字的和
#include "iostream"
using namespace std;
int main()
{
int a,sum=0;
cin >> a;
while (a)
{
sum = sum + a % 10;
a = a / 10;
}
cout << sum << endl;
return 0;
}
- 九九乘法表
#include "iostream"
using namespace std;
int main()
{
int n,i,j;
cin >> n;
for (i = 1; i <= n; i++)
{
for (j = 1; j < i; j++)
{
cout << i << "*" << j << "=" << i*j << " ";
}
cout << i << "*" << j << "=" << i*j ;
cout << endl;
}
return 0;
}
- 不一樣的九九乘法表
#include "iostream"
using namespace std;
int main()
{
int n, i, j;
cin >> n;
for (i = n; i >= 1; i--)
{
for (j = 1; j < i; j++)
{
cout << i << "*" << j << "=" << i*j << " ";
}
cout << i << "*" << j << "=" << i*j;
cout << endl;
}
return 0;
}
- Fibonacci序列
#include "iostream"
using namespace std;
int main()
{
int n, fib=1,fib_1=1,fib_2=0;
cin >> n;
cout << "0";
while (n)
{
cout <<" "<<fib;
fib = fib_1 + fib_2;
fib_2 = fib_1;
fib_1 = fib;
n--;
}
return 0;
}
以上為第三次基礎練習。