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C method question 1
2022-07-07 23:34:00 【Bobo in summer】
1. Palindrome refers to a string that reads both forward and backward . Write a method , Judging a string str1, Is it a palindrome , Is a palindrome that returns true, Otherwise return to false. Like strings b yes ag7ga It's palindrome. , And strings abc6es It's not palindrome . Require application writing , To test the correctness of the method .
public static bool huiwen(string s)
{
bool a;
string str = null;
for (int i = s.Length - 1; i >= 0; i--)
{
str += s[i];
}
if (str == s)
{
a = true;
}
else
a = false;
return a;
}
string s = Console.ReadLine();
bool a = huiwen(s);
if (a == true)
Console.WriteLine(" It's palindrome. ");
else
Console.WriteLine(" Not a palindrome ");
Console.ReadLine();
2. Write a method , Count the number of words in a string , The return value is the number of words . Specify that words are separated by several spaces . For example, if you enter a string " I am a student ", The result is 4. Require application writing , To test the correctness of the method .
public static int words(string s)
{
int count = 1;
for (int i = 0; i < s.Length; i++)
{
*****if (s[i] == ' ' && s[i + 1] != ' ')*****
{
count++;
}
}
return count;
}
string s = Console.ReadLine();
int a = words(s);
Console.WriteLine(" The number of words is {0}", a);
Console.ReadLine();
3. Write a method , Judge whether a positive integer is a prime number , The return value is of boolean type . Require application writing , seek 1-100 All the prime Numbers between .
public static bool sushu(int a)
{
for (int i = 2; i < a; i++)
{
if (a % i == 0)
{
return false;
}
}
return true;
}
public static void Main(string[] args)
{
int aaa =int.Parse(Console.ReadLine());
if (sushu(aaa) == true)
{
Console.WriteLine(" Prime number ");
}
else
Console.WriteLine(" Not primes ");
for (int i = 1; i < 100; i++)
{
if (sushu(i) == true)
Console.WriteLine(i);
}
4. Enter a string , Statistics string Chinese and English letters 、 Number of numeric characters and other symbols and output . Require application writing , To test the correctness of the method .
static void Letterdigitfuhao(string st)
{
string ssletter = "";
string ssdigit = "";
string ssfuhao = "";
int letter = 0;
int digit = 0;
int fuhao = 0;
for (int i = 0; i < st.Length; i++)
{
***if (char.IsLetter(st[i]))***
{
letter++;
ssletter += st[i];
}
else if (char.IsDigit(st[i]))
{
digit++;
ssdigit += st[i];
}
else
{
fuhao++;
ssfuhao += st[i];
}
}
Console.WriteLine(" The number of letters is {0} individual , Among them is {1}", letter, ssletter);
Console.WriteLine(" The number is {0} individual , Among them is {1}", digit, ssdigit);
Console.WriteLine(" The number of other symbols is {0} individual , Among them is {1}", fuhao, ssfuhao);
}
public static void Main(string[] args)
{
Console.WriteLine(" Please enter a string ：");
string st = Console.ReadLine();
Letterdigitfuhao(st);
Console.ReadLine();
}
5. Write a method , Right integer m Sum up , The summation formula is s= 1/2+1/3+…+1/m, Method returns s Value . Require application writing , To test the correctness of the method .
public static double ssum(double n)
{
double sum = 0;
for (double i = 1; i < n; i++)
{
sum += 1 / (i + 1);
}
return sum;
}
double aaa =double.Parse( Console.ReadLine());
Console.WriteLine(ssum(aaa));
public static string AddDollar(string sentence)
{
string st = string.Empty;
for (int i = 0; i < sentence.Length; i++)
{
***if (char.IsLetter(sentence[i]))***
{
st += sentence[i] + "$";
}
else
{
st += sentence[i];
}
}
return st;
}
string st = Console.ReadLine();
Console.WriteLine(" Add ￥ The result is {0}", AddDollar(st));
6. Write a method , Add one after all English characters in a string $ character , And return the processed string . For example, the input ：A1B23CD45, The return value of the method is ：A$1B 23 C 23C 23CD$45, Require application writing , To test the correctness of the method .
public static string AddDollar(string sentence)
{
string st = string.Empty;
for (int i = 0; i < sentence.Length; i++)
{
***if (char.IsLetter(sentence[i]))***
{
st += sentence[i] + "$";
}
else
{
st += sentence[i];
}
}
return st;
}
public static void Main(string[] args)
{
Console.WriteLine(" Please enter a string ：");
string st = Console.ReadLine();
Console.WriteLine(" Add ￥ The result is {0}", AddDollar(st));
}
7. Write a method , Delete all lowercase characters in the string , The rest of the characters remain unchanged . Method returns the converted String .str=“AbC” Change to string to =“AC”, Require application writing , To test the correctness of the method .
public static string Dellower(string stt)
{
string st1 = string.Empty;
for (int i = 0; i < stt.Length; i++)
{
if (char.IsUpper(stt[i]))
{
st1 += stt[i];
}
}
return st1;
}
public static void Main(string[] args)
{
Console.WriteLine(" Please enter a string :");
string sttttt = Console.ReadLine();
Console.WriteLine(Dellower(sttttt));
Console.ReadLine();
}
8. Write a method , For a string , Encrypt according to the following rules ： If it is an English letter, capital will change to lowercase 、 Lowercase to uppercase , For non English characters, it remains unchanged . The return value is to return the encrypted string . Require application writing , To test the correctness of the method .
public static string UpperLowerDigit(string stt)
{
string st = string.Empty;
for (int i = 0; i < stt.Length; i++)
{
if (char.IsUpper(stt[i]))
{
st += char.ToLower(stt[i]);
}
else if (char.IsLower(stt[i]))
{
st += char.ToUpper(stt[i]);
}
else if (char.IsDigit(stt[i]))
{
st += stt[i];
}
}
return st;
}
public static void Main(string[] args)
{
Console.WriteLine(" Please enter a string :");
string st = Console.ReadLine();
Console.WriteLine(UpperLowerDigit(st));
Console.ReadLine();
}
9. Write a method , Find two integers m and n Maximum common divisor of , And return... As a return value . Require application writing , To test the correctness of the method .
public static int Gongyushu(int m, int n)
{
int gys = 0;
int temp = 0;
if (m < n)
{
temp = m;
m = n;
n = temp;
}
***for (int i = n; i > 0; i--)***
{
***if (m % i == 0 && n % i == 0)***
{
gys = i;
break;
}
}
return gys;
}
public static void Main(string[] args)
{
Console.WriteLine(" Find two integers m and n Maximum common divisor of ");
int m = int.Parse(Console.ReadLine());
int n = int.Parse(Console.ReadLine());
Console.WriteLine(Gongyushu(m, n));
Console.ReadLine();
}
10. Write a method , Find two integers m and n The least common multiple of , And return... As a return value . Require application writing , To test the correctness of the method .
public static int Gongbeishu(int m, int n)
{
int gys = 0;
int temp = 0;
if (m < n)
{
temp = m;
m = n;
n = temp;
}
for (int i = m; i <= m * n; i++)
{
if (i % m == 0 && i % n == 0)
{
gys = i;
break;
}
}
return gys;
}
public static void Main(string[] args)
{
Console.WriteLine(" Find two integers m and n Maximum common divisor of ");
int m = int.Parse(Console.ReadLine());
int n = int.Parse(Console.ReadLine());
Console.WriteLine(Gongbeishu(m, n));
Console.ReadLine();
}
11. Write a method , seek s=1/a+1/aa+1/aaa+1/aaaa+1/aa…a Value , among a Is a user-defined number . for example 1/2+1/22+1/222+1/2222+1/22222( At this time, there is 5 Add up the numbers ), The return values are and s. Require application writing , To test the correctness of the method .
***public static double Aaaaa(double aa, int nn)***
{
double s = 0;
double b = 1;
for (int i = 1; i < nn; i++)
{
b = b * 10 + 1;
s += 1 / (b * aa);
}
return s + 1 / aa;
}
public static void Main(string[] args)
{
Console.WriteLine(" Please enter a number a(a yes 1-9 Number between ):");
double aaa = double.Parse(Console.ReadLine());
Console.WriteLine(" frequency ：");
int nnnn = int.Parse(Console.ReadLine());
Console.WriteLine(Aaaaa(aaa, nnnn));
Console.ReadLine();
}
12. Write a method , Judge whether a number is perfect , The return value is of boolean type . If a number is exactly equal to the sum of its factors , This number is called “ Complete ”. for example 6=1＋2＋3. Require application writing , To test the correctness of the method .
public static bool wanshu(double n)
{
double sum = 0;
for (int i = 1; i < n; i++)
{
if (n % i == 0)
{
sum += i;
}
}
if (sum == n)
return true;
else
return false;
}
double aaa = double.Parse(Console.ReadLine());
Console.WriteLine(wanshu(aaa));
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