Question

You are to write two functions, printString() and testString(), which are called from the main function.

1. printString (string) prints characters to std::cout with a space after every character and a newline at the end.
2. testString (string) returns true if the string contains two consecutive characters that are the same, false otherwise. See the main() to see how the two functions are called.

Some sample runs are given below:

• string: “hello”
• printString prints: h e l l o
• testString returns: true (because of ‘l’ and ‘l’)

• string: “world”
• printString prints: w o r l d
• testString returns: false

• string: “hello world”
• printString prints: h e l l o   w o r l d
• testString returns: true (because of ‘l’ and ‘l’)

Note:

• Write only the two functions in the space provided.
• You can change the main function for your own testing. Your code will be tested with a similar main function.

Hints:

• You can access the i-th character of a string s with s[i]. You can compare characters using the == operator.
• The number of characters in the string is s.size().

prob1.cpp

#include <iostream>
#include <string>

using std::string;
using std::cout;
using std::endl;
bool checkAnswer(const string &nameOfTest, bool received, bool expected);

// Implement printString here

// Implement testString here

// EDIT CODE BELOW ONLY FOR TESTING (ANY CODE BELOW WILL BE OVER-WRITTEN DURING GRADING WITH DIFFERENT TESTS)

int main() {
cout << "Test if the string contains two consecutive characters that are the same" << endl;
{
string s = "hello";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "world";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), false);
}
{
string s = "hello world";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "zzz";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "snakess";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "a";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), false);
}
//   system("pause"); // comment/uncomment if needed

return 0;
}

bool checkAnswer(const string &nameOfTest, bool received, bool expected) {
if (received == expected) {
cout << "PASSED " << nameOfTest << ": expected and received " << received << endl;
return true;
}
cout << "FAILED " << nameOfTest << ": expected " << expected << " but received " << received << endl;
return false;
}

Answer 1

#include <iostream>
#include <string>

using std::string;
using std::cout;
using std::endl;
bool checkAnswer(const string &nameOfTest, bool received, bool expected);


void printString(string s)
{
    for(int i=0;i<s.size();i++)
    {
        std::cout <<s[i]<<" ";
    }
}

bool testString(string s)
{
    bool flag=false;
    
    for(int i=1;i<s.size();i++)
    {
        if(s[i]==s[i-1])
        {
            flag=true;
            break;
        }
    }
    
    return flag;
}

int main() {
cout << "Test if the string contains two consecutive characters that are the same" << endl;
{
string s = "hello";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "world";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), false);
}
{
string s = "hello world";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "zzz";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "snakess";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), true);
}
{
string s = "a";
cout << "Contents of array : ";
printString(s);
   checkAnswer(s, testString(s), false);
}
//   system("pause"); // comment/uncomment if needed

return 0;
}

bool checkAnswer(const string &nameOfTest, bool received, bool expected) {
if (received == expected) {
cout << "PASSED " << nameOfTest << ": expected and received " << received << endl;
return true;
}
cout << "FAILED " << nameOfTest << ": expected " << expected << " but received " << received << endl;
return false;
}