c++ 5. getString Function Write a function named getString that has a local char

Question

c++ 5. getString Function

Write a function named getString that has a local char array of 80 elements.
The function should ask the user to enter a sentence, and store the sentence
in the array. Then the function should dynamically allocate a char array
just large enough to hold the sentence, plus the null terminator. It should
copy the sentence to the dynamically allocated array, and then return a
pointer to the array. Demonstrate the function in a complete program.

Note: You need to write your own string copy function, not use the standard library version.


its for starting out with c++ 6ed tony g.

Explanation / Answer

#include <iostream>

using namespace std;

int main()
{
   //PROTOTYPES
   char* getString();

   //LOCAL DECLARATIONS

   //PROCEDURES
   cout << "Enter sentence 1: ";
   char* sentence1 = getString();
   cout << " Sentence 1: " << sentence1 << endl;

   cout << " Enter sentence 2: ";
   char* sentence2 = getString();
   cout << " Sentence 1: " << sentence2 << endl;

   //Because getString() use dynamic allocation or the new keyword, you'll have to delete those dynamic array
   delete [] sentence1;
   delete [] sentence2;
   cin.get();
   return 0;
}

//---------------------------------------------------------
// FUNCTION DEFINITIONS
//---------------------------------------------------------
char* getString()
{
   const int BUF_SIZE = 80;
   char buf[BUF_SIZE];
   int bufCharCount = 0;
   int i;

   cin.getline(buf, BUF_SIZE); //get input line
   for (i = 0; buf[i] != 0; ++i) //count the characters in the line
   {
      bufCharCount++;
   }
   char *dynamicString = new char[bufCharCount + 1]; //dynamic allocate the appropriate memory for these characters
   for (i = 0; buf[i] != 0; ++i) //copy from the buffer string to the dynamic string
   {
      dynamicString[i] = buf[i];
   }
   dynamicString[bufCharCount] = ''; //the end char of dynamic string must be null

   return dynamicString;
}

************Sample output*************
Enter sentence 1: This is first line

Sentence 1: This is first line

Enter sentence 2: And this is second line . .

Sentence 1: And this is second line . .

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.