Question

In C++ please!

*Do not use any other library functions(like strlen) than the one posted(<cstddef>) in the code below!*

4 THE FINDANY FUNCTION Write the function findAny().The function has two parameters: a const char * s pointing to the first character in a C-style string, and a const char * letters. Return the index of the first character in s that matches any letter inside letters. Return -1 if no letters match.

/**
CS 150 C-Strings

Follow the instructions on your handout to complete the
requested function. You may not use ANY library functions
or include any headers, except for <cstddef> for size_t.
*/
#include <cstddef> // size_t for sizes and indexes
///////////////// WRITE YOUR FUNCTION BELOW THIS LINE ///////////////////////

///////////////// WRITE YOUR FUNCTION ABOVE THIS LINE ///////////////////////
// These are OK after the function
#include <iostream>
#include <string>
using namespace std;

void CHECK(const char*, const char *, int);

void studentTests()
{
cout << "Student testing. Add code in this function." << endl;
cout << "-------------------------------------------------------------" << endl;

CHECK("This is a test.", "!.,?;:", 14);
CHECK("This is a test.", "sth", 1);
CHECK("This is a test.", "aeiou", 2);
CHECK("This is a test.", " \t\n\r", 4);
CHECK("This is a test.", "Bob", -1);

cout << endl;
cout << "--done--" << endl;
}

int main()
{
studentTests();
}
#include <cstring>
string repl(const string& s)
{
string r;
for (auto c: s)
{
switch(c)
{
case '\t': r += R"(\t)"; break;
case '\n': r += R"(\n)"; break;
case '\r': r += R"(\r)"; break;
default: r += c;
}
}
return r;
}
void CHECK(const char * s1, const char * s2, int expected)
{
string msg = "findAny(\"" + string(s1) + "\", \"" + repl(string(s2)) + "\")";
char d1[1024], d2[1024];
strcpy(d1, s1);
strcpy(d2, s2);
int actual = findAny(d1, d2);
if (expected == actual)
cout << " + " + msg + "->OK" << endl;
else
cout << " X " + msg + " expected<" << expected << ">, found <" << actual << ">" << endl;
}

Answer 1

#include <cstddef> // size_t for sizes and indexes

///////////////// WRITE YOUR FUNCTION BELOW THIS LINE ///////////////////////
int findAny(const char* s, const char* letters){
   int len1 = 0, len2 = 0;
   //len1 for length of the first string
   for(int i = 0; s[i] != '\0'; i++) len1++;
   //len2 for length of the second string
   for(int i = 0; letters[i] != '\0'; i++) len2++;
  
   //Main loop
   for(int i = 0; i < len1; i++){
       int found = 0;
       //Checking if any character in s string matches with any character in letters string
       for(int j = 0; j < len2; j++){
           //if found then break the inner loop
           if(s[i] == letters[j]){
               found = 1;
               break;
           }
       }
       //if found then return the index
       if(found)
           return i;
   }
   //if not found return -1
   return -1;
}
///////////////// WRITE YOUR FUNCTION ABOVE THIS LINE ///////////////////////
// These are OK after the function
#include <iostream>
#include <string>
using namespace std;

void CHECK(const char*, const char *, int);

void studentTests()
{
       cout << "Student testing. Add code in this function." << endl;
       cout << "-------------------------------------------------------------" << endl;
      
       CHECK("This is a test.", "!.,?;:", 14);
       CHECK("This is a test.", "sth", 1);
       CHECK("This is a test.", "aeiou", 2);
       CHECK("This is a test.", " \t\n\r", 4);
       CHECK("This is a test.", "Bob", -1);
      
       cout << endl;
       cout << "--done--" << endl;
       }

int main()
{
studentTests();
}
#include <cstring>
string repl(const string& s)
{
   string r;
   for (auto c: s)
   {
   switch(c)
   {
   case '\t': r += R"(\t)"; break;
   case '\n': r += R"(\n)"; break;
   case '\r': r += R"(\r)"; break;
   default: r += c;
   }
   }
   return r;
}
void CHECK(const char * s1, const char * s2, int expected)
{
   string msg = "findAny(\"" + string(s1) + "\", \"" + repl(string(s2)) + "\")";
   char d1[1024], d2[1024];
   strcpy(d1, s1);
   strcpy(d2, s2);
   int actual = findAny(d1, d2);
   if (expected == actual)
   cout << " + " + msg + "->OK" << endl;
   else
   cout << " X " + msg + " expected<" << expected << ">, found <" << actual << ">" << endl;
}