1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elina [12.6K]
3 years ago
8

Write a function named replaceSubstring. The function should accept three C-string arguments, let's call them string1, string2,

and string3. It should search string1 for all occurrences of string2. When it finds an occurrence of string2, it should replace it with string3. For example, suppose the three arguments have the following values: string1 : the dog jumped over the fence string2: the string3: that Using these values for the three arguments, the function would return another C-string object with the value "that dog jumped over that fence". Please do not use any of the functions in the string class. However you may use any functions such as strstr and strncpy.

Computers and Technology
2 answers:
blsea [12.9K]3 years ago
7 0

Answer:                

Here is the C++ program

#include <iostream> // for input output functions

#include <cstring>  //functions for c string manipulation

#include <string>// to manipulate arrays of characters

using namespace std; // to identify objects such as cout cin

string replaceSubstring( char *,  char *,  char*);  

// function to replace a substring within a sentence to another string

int main() //start of main() function body

{    char string1[100]; // character type array that holds a string for //example the dog jumped over the fence

   char string2[100]; //character type array that holds a sub string of //string1 for example "the"

   char string3[100]; //character type array that contains the string that is to //be replaced with the string2    

   cout << "string 1: "; //prompts user to input string 1

   cin.getline(string1, 100); // reads the string entered by the user

   cout << "string 2: ";//prompts user to enter string 2

   cin.getline(string2, 100); // reads the string entered by the user

   cout << "string 3: ";//prompts user to enter string 3

   cin.getline(string3, 100); // reads the string entered by the user

   cout <<endl; // to insert a new line

   cout << replaceSubstring(string1, string2, string3); }

//calls replaceSubstring() function

string replaceSubstring( char *stringA,  char *stringB,  char *stringC){  

   char *find = stringA;  //pointer find which searches the string in stringA

   char *word = strstr(stringA, stringB);  //pointer word that locates the //string specified in stringB in stringA

   string result = ""; //an empty string to return the final output string

   while(word){ // loop searches the given word that is to be replaced

//the loop iterates until no more  occurrences of the word are found

//append characters of stringA to result string until the first occurance of //the word specified in stringB

       result.append(stringA, (word - stringA));

//append stringC to the result string

       result.append(stringC, strlen(stringC));

//update word to point to character  of stringA after first occurrence of //stringB

       stringA = stringA + (word - stringA) + strlen(stringB);

       //find or locate the new occurrence of word

       word = strstr(stringA, stringB);   }    

     //stringA points to first character after last occurrence of stringB

   result.append(stringA, strlen(stringA));

   return result; }      //returns the final string in output

 

Explanation:

In this program there are three arrays.

string1 which holds the string for example the do jumped over the fence.

string2 holds the string whose occurrence is to be found in string1 example, "the" in string2 is the word that is to be located in string1.        

string3 contains the string which is used to replace the string specified in the string2. For example value of string3 is "that". So in string1 "the dog jumped over the fence", the word "the" specified in string2 is to be replaced by "that" in string3. So the resultant string will be "that dog jumped over that fence".

After taking the values of above mentioned character arrays from the user, the program calls function  replaceSubstring()

The function replaceSubstring() contains a pointer find that is initialized to stringA which is basically string1 to start the search. This function also has a pointer word that is initialized to the first occurrence  of stringB (which is basically string2) in stringA (string1).

As an example, the word "the" in stringB is located in stringA (the dog jumped over the fence).

So the while loop is used in which the occurrence of word "the" is found in stringA and when it finds the occurance of stringB (the) in stringA (the dog jumped over the fence) it replaces the value of stringB to the value specified in stringC . The while loop keeps locating the occurances of the stringB in stringA.

The result variable is used to store the final output string.

The append() function is used to first append the value of stringA to result string till first occurance of stringB. It then appends stringC to result string.  Then stringA points to first character after  the last occurrence of stringB.

The result variable the displays the final output that is : that dog jumped over that fence.

The screen shot of the program along with its output is attached.

hoa [83]3 years ago
6 0

Answer:

All is in explanation.

Explanation:

#include <iostream>

#include <cstring>

#include <string>

using namespace std;

//function prototype

string replaceSubstring(const char *, const char *, const char*);

string replaceSubstring(string, string, string);

int main()

{

//declare three char array to hold strings of max 100 chars

char string1[101];

char string2[101];

char string3[101];

//prompt user to enter input

//then read

cout << "Enter string to search:\n";

cin.getline(string1, 101);

cout << "Enter the string you want to replace:\n";

cin.getline(string2, 101);

cout << "What do you want to replace it with?\n";

cin.getline(string3, 101);

cout << "Your updated string is:\n";

cout << replaceSubstring(string1, string2, string3);

//return 0 to mark successful termination

return 0;

}

string replaceSubstring(const char *st1, const char *st2, const char *st3){

//declare pointers start and occurrence

//initialize start with string to search

//char *startSearch = st1;

//initialize occurrence with the first occurrence

//of st2 in st1

char *occurrence = strstr(st1, st2);

//declare empty string

string output = "";

//using occurrence as control for while loop

//means that it will iterate until no more

//occurrences are found

while(occurrence){

//append to final string the characters of st1

//up until first occurrence of st2

output.append(st1, (occurrence-st1));

//append st3 to final string

output.append(st3, strlen(st3));

//update occurrence to point to character

//of st1 just after first occurrence of st2

st1 = st1 + (occurrence-st1) + strlen(st2);

//find new occurrence

occurrence = strstr(st1, st2);

}

//st1 now points to first character after

//last occurrence of st2

output.append(st1, strlen(st1));

return output;

}

string replaceSubstring(string st1, string st2, string st3){

//convert input strings to C-strings

const char *ptr1 = st1.c_str();

const char *ptr2 = st2.c_str();

const char *ptr3 = st3.c_str();

//call function that accepts C-strings

replaceSubstring(ptr1, ptr2, ptr3);

}

You might be interested in
Is the Internet dangerous?
VARVARA [1.3K]

Many people would answer this in many different ways. In my personal opinion, it's a yes. It's a yes because it makes it easier for people to track you down (finding your iep) and it's easy for someone to take your identity. It's also dangerous for children and teens (even young adults) because there are many people wanting them, and wanting to meet them in public and things like that. I hope I answered your question! (:

8 0
3 years ago
Read 2 more answers
Define each of the following data mining functionalities: characterization, discrimination, association and correlation analysis
Step2247 [10]

Answer:

In the clarification portion below, the definition according to the received information is summarized.

Explanation:

  • <u>Characterization:</u>

It is indeed a summary of general object characteristics in something like a target class and creates characteristic laws.

  • <u>Discrimination:</u>

Just before predefined data types have been held to a different standard from everyone else, it's indeed bias which always happens.

  • <u>Association:</u>

It's a mechanism that determines the possibility that objects in a set will co-occur.

  • <u>Classification:</u>

It is indeed duction which attributes elements to target groups or classes in a set.

  • <u>Prediction:</u>

It is solely dependent on either the interpretation of other similar values to classify data points.

  • <u>Clustering:</u>

It has been used to position the components of the information through their corresponding classes.

  • <u>Evolution Analysis:</u>

It would be for objects whose behavior varies throughout time to explain or design regularities.

5 0
3 years ago
You have just performed a cpm analysis and have found that more than one path through the project network has zero slack values.
Alex787 [66]

Answer:

There are multiple critical paths

Explanation:

The critical path method (CPM), or critical path analysis (CPA), is an algorithm for scheduling a set of project activities. It is commonly used in conjunction with the program evaluation and review technique (PERT). A critical path is determined by identifying the longest stretch of dependent activities and measuring the time required to complete them from start to finish.

The essential technique for using CPM is to construct a model of the project that includes the following:

  •    A list of all activities required to complete the project (typically categorized within a work breakdown structure),
  •    The time (duration) that each activity will take to complete,
  •    The dependencies between the activities and,
  •    Logical end points such as milestones or deliverable items.      

Using these values, CPM calculates the longest path of planned activities to logical end points or to the end of the project, and the earliest and latest that each activity can start and finish without making the project longer. This process determines which activities are "critical" (i.e., on the longest path) and which have "total float" (i.e., can be delayed without making the project longer).

considering the above function of the cpm analysis because you have multiple path, there is tendency that more than path through the project network will have zero slack values.

5 0
3 years ago
What is a spreadsheet​
Delicious77 [7]
A spreadsheet function that indicates the average of a group of numbers in a range.
8 0
3 years ago
The general syntax to overload the stream extraction operator &gt;&gt; for a class is ____.
Aloiza [94]
Istream& operator>> (istream& input, Example& example)
{
// Extract your data from input stream here
return input;
}
5 0
3 years ago
Other questions:
  • To apply format to text, both the text and the text box must be selected.
    13·1 answer
  • The illustrations group contains all but a _______​
    9·1 answer
  • What three steps Name a group??
    14·1 answer
  • The chief reason that family and friends are frequent targets of aggression is that
    6·1 answer
  • Can you make copies of classified documents provided you alert others?
    6·1 answer
  • One key to success in a career is to be an accomplished
    15·1 answer
  • Does anyone know where online I can buy the MacBook Air 2017 at I can’t find any I’ll give brainlist and points
    5·1 answer
  • While reading difficult content, you should always start witha.Surveying the chapterc.Reading the chapterb.Defining vocabulary w
    8·1 answer
  • Pls help me im confused prob more on the way
    6·1 answer
  • Extended essay on globalization not less than 200​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!