Question
Write a program that reads in a line of text and replaces all four-letter
words with the word "love". For example, the input string
I hate you, you dodo!
CHAPTER 8 / Strings and Vectors
should produce the output
I love you, you love!
Of course, the output will not always make sense. For example, the input
string
John will run home.
should produce the output
Love love run love.
If the four-letter word starts with a capital letter, it should be replaced by
"Love", not by "love". You need not check capitalization, except for the
first letter of a word. A word is any string consisting of the letters of the
alphabet and delimited at each end by a blank, the end of the line, or any
other character that is not a letter. Your program should repeat this action
until the user says to quit.
Answer
#include <iostream>
#include <string>
#include <cmath>
#include <cctype>
using namespace std;
const int SIZE = 40;
void get_input(string& input_line);
string replace_with_love(string input_line);
int main()
{
start:
string input_line, love_string;
get_input(input_line);
love_string = replace_with_love(input_line);
cout << love_string << endl;
system("pause");
goto start;
}
void get_input(string& input_line)
{
char answer;
string one[SIZE];
int i = 0;
string word;
cout << "Enter a line of text and press return (alternatevely, input a single character and press enter to end the program)" << endl;
getline(cin, input_line);
}
string replace_with_love(string input_line)
{
string one[SIZE];
string love_string(input_line);
string temp;
unsigned int location, location2, count = 0, Love = 0;
unsigned int pos = 0, last = 0;
if (love_string.length() <= 1)
{
system("pause");
exit(1);
}
last = input_line.find_last_of(" ");
while ((pos < input_line.length()) && (count < SIZE))
{
location = input_line.find(" ", pos);
location2 = input_line.find(" ", location + 1);
if (pos == 0)
{
one[count] = input_line.substr(pos, location);
count++;
pos = location;
continue;
}
if (last == location)
{
one[count] = input_line.substr((pos + 1), (location));
one[count + 1] = input_line.substr(pos);
pos *= 10;
}
else if ((location > (last + 10)) || (location2 > (last + 10)))
pos *= 10;
else
{
one[count] = input_line.substr(pos + 1, ((location2)-(location + 1)));
}
pos = location2;
count++;
}
for (int i = 0; i < count; i++)
{
if (one[i].length() == 4)
{
temp = one[i];
if (isupper(temp.at(0)))
{
one[i] = "Love";
Love++;
}
else
{
one[i] = "love";
Love++;
}
}
}
if (Love < 2)
{
cout << "There are not enough 4 letter words in this sentence!" << endl;
system("pause");
main();
}
else {
love_string.clear();
for (int n = 0; n < count; n++)
love_string += one[n] + " ";
return love_string;
}
}
Result Output:
Enter a line of text and press return (alternatively, input a single character and press enter to end the program)
I hate you, you dodo!
I love love you dodo!