2023-12-18

This commit is contained in:
2023-12-18 23:29:15 +08:00
parent 117bf4ce75
commit 5667dabd66
42 changed files with 2425 additions and 0 deletions

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#include <iostream>
using namespace std;
int main()
{
char s[200];
cout << "请输入一行字符串:\n";
cin.getline(s, 200);
int a = 0, b = 0, c = 0;
for (int i = 0; s[i] != '\0'; i++)
{
if (s[i] >= 'A' && s[i] <= 'Z') a++;
else if (s[i] >= 'a' && s[i] <= 'z') b++;
else if (s[i] >= '0' && s[i] <= '9') c++;
}
cout << "大写字符计数:" << a << '\t' << "小写字符计数:" << b << '\t' << "数字字符计数:" << c << endl;
return 0;
}

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#include <iostream>
#include <string>
using namespace std;
int main()
{
char str[100];
int flag = 0;
cout << "Input a string:\n";
cin.getline(str, 100);
for (int i = 0; str[i] != '\0'; i++)
{
if (str[i] >= 'a' && str[i] <= 'z' && flag == 0)
{
str[i] = str[i] - 0x20;
flag = 1;
}
if (str[i] == ' ' || str[i] == '\n')
flag = 0;
}
cout << "the result is:\n";
cout << str << endl;
return 0;
}
// I am a student. -> I Am A Student.

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#include <iostream>
using namespace std;
int main()
{
char a[25565];
cin.getline(a, 25565);
int b = 0, flag = 0;
for (int i = 0; a[i] != '\0'; i++)
{
{
if (((a[i] >= 0x41 && a[i] <= 0x5A) || (a[i] >= 0x61 && a[i] <= 0x7A)) && flag == 0)
{
b++;
flag = 1;
}
if (a[i] == 0x20 || a[i] == 0x21 || a[i] == 0x2c || a[i] == 0x2e || a[i] == 0x3a || a[i] == 0x3b || a[i] == 0x3f)
flag = 0;
}
}
cout << b << " words" << endl;
return 0;
}

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@@ -0,0 +1,31 @@
#include <iostream>
using namespace std;
bool isLetter(char in)
{
if ((in >= 0x41 && in <= 0x5A) || (in >= 0x61 && in <= 0x7A)) return true;
else return false;
}
int main()
{
char longest_word[100], string[25565];
int length = 0, length_temp, begin;
cin.getline(string, 25565);
for (int i = 0; string[i] != '\0'; i++)
if (isLetter(string[i]) == true)
{
begin = i;
do i++; while (isLetter(string[i]) == true);
length_temp = i - begin;
if (length_temp > length)
{
length = length_temp;
for (int j = 0; j < length; j++)
longest_word[j] = string[begin + j];
}
}
cout << "The longest word is ";
for (int k = 0; k < length; k++)
cout << longest_word[k];
cout << endl;
return 0;
}

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@@ -0,0 +1,135 @@
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View File

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View File

@@ -0,0 +1,28 @@
#include <iostream>
using namespace std;
void fun(int* w, int p, int n)
{
int t, i, j;
for (i = 0; i <= p; i++)
{
t = *w;
for (j = 0; j < n - 1; j++)
*(w + j) = *(w + j + 1);
*(w + j) = t;
}
}
int main()
{
int a[] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 };
int p;
cout << "Input p:";
cin >> p;
int n = sizeof(a) / sizeof(int);
fun(a, p, n);
for (int i = 0; i < n; i++)
cout << a[i] << '\t';
cout << endl;
return 0;
}
// 4 -> 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5

View File

@@ -0,0 +1,135 @@
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View File

@@ -0,0 +1,40 @@
#include <iostream>
#include <cmath>
using namespace std;
double f1(double x)
{
return 1.0 / (2 + sin(x));
}
double f2(double x)
{
return 1.0 / (2 - cos(x));
}
double f3(double x)
{
return (1 + x) / (1 + x * x);
}
double integral(double (*pf)(double), int n, double a, double b)
{
double h;
h = (b - a) / n;
double result;
result = (pf(a) + pf(b)) / 2;
for (int i = 1; i < n; i++)
result = result + pf(a + i * h) + pf(a + (i + 1) * h);
result = result * h;
return result;
}
int main(void)
{
cout << "f1(x):" << '\t';
cout << "n = 1000 " << integral(f1, 1000, 1.0, 2.0) << endl;
cout << "f2(x):" << '\t';
cout << "n = 2000 " << integral(f2, 2000, 2.0, 3.0) << endl;
cout << "f3(x):" << '\t';
cout << "n = 3000 " << integral(f3, 3000, 2.0, 4.0) << endl;
return 0;
}
// f1(x) : n = 1000 0.676267
// f2(x) : n = 2000 0.725125
// f3(x) : n = 3000 1.66061

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#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int a[16] = { 55 };
for (int i = 1; i < 16; i++)
*(a + i) = (15 * (*(a + i - 1)) + 97) % 256;
cout << "a数组元素为" << endl;
for (int i = 0; i < 16; i++)
cout << *(a + i) << "\t";
double average = 0;
for (int i = 0; i < 16; i++)
average += *(a + i);
average /= 16;
cout << "\n平均值 = " << average << endl;
int max = average, num;
for (int i = 0; i < 16; i++)
if (abs(*(a + i) - average) > abs(max - average))
{
max = *(a + i);
num = i;
}
cout << "最大值 = " << max << endl;
cout << "删除" << max << "后的数组元素:" << endl;
for (int i = 0; i < 16; i++)
{
if (i == num)
continue;
cout << *(a + i) << "\t";
}
}

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#include <iostream>
using namespace std;
double average(int(*p1)[4], int* p2)
{
double sum = 0;
for (int i = 0; i < *p2; i++)
for (int j = 0; j < 4; j++)
sum += p1[i][j];
return sum / ((*p2) * 4);
}
int max(int(*p1)[4], int* p2)
{
int max = 0;
for (int i = 0; i < *p2; i++)
for (int j = 0; j < 4; j++)
if (p1[i][j] > max)
max = p1[i][j];
return max;
}
int min(int(*p1)[4], int* p2)
{
int min = 100;
for (int i = 0; i < *p2; i++)
for (int j = 0; j < 4; j++)
if (p1[i][j] < min)
min = p1[i][j];
return min;
}
int main()
{
int a[3][4] = { {2,3,4,5},{12,13,14,15},{1,2,3,4} };
int r = 3;
cout << "ave=" << average(a, &r) << '\t';
cout << "max=" << max(a, &r) << '\t';
cout << "min=" << min(a, &r) << endl;
return 0;
}

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View File

@@ -0,0 +1,19 @@
#include <iostream>
#include <string>
using namespace std;
int main()
{
char str[100];
cout << "请输入一串数字字符:";
cin.getline(str, 100);
int i = 0, s = 0;
while (str[i])
{
s = s * 10 + str[i] - '0';
i++;
}
cout << s << endl;
return 0;
}
// 1234 -> 1234

View File

@@ -0,0 +1,135 @@
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View File

@@ -0,0 +1,22 @@
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View File

@@ -0,0 +1,45 @@
#include <iostream>
#include <string>
using namespace std;
void fun1(char* s, int n, int r)
{
int i = 0, t;
while (n)
{
t = n % r;
if (t >= 10)
s[i++] = t - 10 + 'A';
else
s[i++] = t + '0';
n = n / r;
}
s[i] = '\0';
}
void fun2(char* s)
{
char ch;
int len = strlen(s);
for (int i = 0; i < len / 2; i++)
{
ch = s[i];
s[i] = s[len - i - 1];
s[len - i - 1] = ch;
}
}
int main()
{
char s[200];
int n, r;
cout << "请输入您想转换的十进制数:";
cin >> n;
cout << "您想将十进制数" << n << "转换成多少进制的数?";
cin >> r;
fun1(s, n, r);
fun2(s);
cout << "十进制数" << n << "转换成" << r << "进制的数,结果为:" << s << endl;
return 0;
}
// 123 2 -> 1111011
// 123 8 -> 173
// 123 16 -> 7B

View File

@@ -0,0 +1,135 @@
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View File

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View File

@@ -0,0 +1,33 @@
#include <iostream>
#include <string>
using namespace std;
int getInt(char* input, int* output)
{
int count = 0;
while (*input)
{
if (isdigit(*input))
{
char* start = input;
while (isdigit(*input))
input++;
output[count++] = stoi(string(start, input));
}
else
input++;
}
return count;
}
int main()
{
char str[25565];
int number[25565];
cout << "请输入一个字符串:";
cin.getline(str, 25565);
int count = getInt(str, number);
cout << "提取到的整数个数为:" << count << endl;
cout << "分别为: ";
for (int i = 0; i < count; i++)
cout << number[i] << " ";
return 0;
}

View File

@@ -0,0 +1,135 @@
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@@ -0,0 +1,22 @@
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@@ -0,0 +1,29 @@
#include <iostream>
#include <cstring>
using namespace std;
int fun(char* str, char* substr)
{
int count = 0, substr_len = strlen(substr);
while (*str)
{
if (strncmp(str, substr, substr_len) == 0)
{
count++;
str += substr_len;
}
else
str++;
}
return count;
}
int main()
{
char string[25565], substring[25565];
cout << "请输入母字符串:";
cin.getline(string, 25565);
cout << "请输入子字符串:";
cin.getline(substring, 25565);
int count = fun(string, substring);
cout << "子字符串\"" << substring << "\"在母字符串\"" << string << "\"中出现的次数为:" << count << endl;
return 0;
}

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