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2023-11-8

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綾瀬桃桃
2023-11-08 19:25:23 +08:00
parent 0120d56856
commit e382a92eee
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71
Classwork6/Classwork6.sln Normal file
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20
Classwork6/S6_1/S6_1.cpp Normal file
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#include <iostream>
using namespace std;
float fun(float x)
{
float y;
y = 2 * x * x + 5 * x + 3;
return y;
}
int main()
{
float y1, y2;
y1 = fun(1.0);
y2 = fun(1.2);
cout << "y1=" << y1 << endl;
cout << "y2=" << y2 << endl;
return 0;
}
// y1=10
// y2=11.88

135
Classwork6/S6_1/S6_1.vcxproj Normal file
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22
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27
Classwork6/S6_2/S6_2.cpp Normal file
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#include <iostream>
#include <cmath>
using namespace std;
float f(float x)
{
float y;
y = x * x + 3 * x - 4;
return y;
}
float df(float x)
{
float y;
y = 2 * x + 3;
return y;
}
int main()
{
float x1, x0;
x1 = 0;
do
{
x0 = x1;
x1 = x0 - f(x0) / df(x0);
} while (abs(f(x1)) > 10e-5);
cout << "x=" << x1 << endl;
return 0;
}

135
Classwork6/S6_2/S6_2.vcxproj Normal file
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30
Classwork6/S6_3/S6_3.cpp Normal file
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#include <iostream>
#include <cmath>
using namespace std;
float f(float x)
{
return x * x + 3 * x - 4;
}
int main()
{
float x1, x2, x0;
do
{
cout << "请输入初值x1和x2:";
cin >> x1 >> x2;
} while ((f(x1) * f(x2)) > 0);
do
{
x0 = (x1 + x2) / 2;
if (f(x0) * f(x1) > 0)
x1 = x0;
else
x2 = x0;
} while (fabs(f(x0)) > 1e-5);
cout << "x0=" << x0 << endl;
return 0;
}
// 0 2 -> 1
// -5 0 -> -4
// 0 -2 x

135
Classwork6/S6_3/S6_3.vcxproj Normal file
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Classwork6/S6_4/S6_4.cpp Normal file
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#include <iostream>
#include <cmath>
using namespace std;
float f(float x)
{
float y;
y = x * x + 3 * x - 4;
return y;
}
int main()
{
float x1, x2, x0;
do
{
cout << "请输入初值x1和x2:";
cin >> x1 >> x2;
} while ((f(x1) * f(x2)) > 0);
do
{
x0 = (x1 * f(x2) - x2 * f(x1)) / (f(x2) - f(x1));
if (f(x0) * f(x1) > 0)
x1 = x0;
else
x2 = x0;
} while (fabs(f(x0)) > 1e-5);
cout << "x0=" << x0 << endl;
return 0;
}
// 0 2 -> 0.999999
// -5 4 -> -4
// 0 -2 x

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Classwork6/S6_5/S6_5.cpp Normal file
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20
Classwork7/S7_1/S7_1.cpp Normal file
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@@ -0,0 +1,20 @@
#include <iostream>
using namespace std;
int prime(int x)
{
for (int i = 2; i < x; i++)
if (x % i == 0)
return 0;
return 1;
}
int main()
{
for (int i = 100; i <= 200; i++)
{
if (prime(i) == 1)
cout << i << '\t';
}
return 0;
}
// 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199

135
Classwork7/S7_1/S7_1.vcxproj Normal file
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24
Classwork7/S7_2/S7_2.cpp Normal file
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#include <iostream>
using namespace std;
int prime(int num)
{
for (int i = 2; i < num; i++)
if (num % i == 0)
return 0;
return 1;
}
int main()
{
int n;
cout << "输入一个整数n:";
cin >> n;
for(int i=2;i<=n/2;i++)
{
if ((prime(i) == 1) && (n % i == 0))
cout << i << '\t';
}
cout << endl;
return 0;
}
// 2145 -> 3 5 11 13

135
Classwork7/S7_2/S7_2.vcxproj Normal file
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31
Classwork7/S7_3/S7_3.cpp Normal file
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@@ -0,0 +1,31 @@
#include <iostream>
using namespace std;
int prime(int num)
{
for (int i = 2; i < num; i++)
if (num % i == 0)
return 0;
return 1;
}
int main()
{
int x, n, m;
cout << "输入一个不小于6的偶数:";
cin >> x;
for (n = 1; n <= x / 2; n++)
{
m = x - n;
if ((prime(n) == 1) && (prime(m) == 1))
cout << x << '=' << n << '+' << m << endl;
}
return 0;
}
// 56=3+53
// 56=13+43
// 56=19+37
// 122=13+109
// 122=19+103
// 122=43+79
// 122=61+61

135
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30
Classwork7/S7_4/S7_4.cpp Normal file
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@@ -0,0 +1,30 @@
#include <iostream>
using namespace std;
int fun(int num)
{
int a = 1, b;
while (true)
{
b = num % 10;
a *= b;
num /= 10;
if (num == 0)
return a;
}
}
int main()
{
int n, mul;
cout << "请输入一个整数(输入0结束):";
cin >> n;
while(n)
{
mul = fun(n);
cout << n << "的各位数之积为" << mul << endl;
cout << "请输入一个整数(输入0结束):";
cin >> n;
}
return 0;
}
// 24 32 0 -> 8 6

135
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