C/C++ C++: Global replacement of a character within a string

[ineedhelpnow]

Complete the function to replace any period by an exclamation point. Ex: "Hello. I'm Miley. Nice to meet you." becomes:

"Hello! I'm Miley! Nice to meet you!"
Sample program:

#include <iostream>
#include <string>
using namespace std;

void MakeSentenceExcited(string& sentenceText) {
<STUDENT CODE>
}

int main() {
string testStr;

testStr = "Hello. I'm Miley. Nice to meet you.";
MakeSentenceExcited(testStr);
cout << testStr;

return 0;
}i came up with
int pos = sentenceText.find('.');
while()
{
sentenceText.replace(pos, 1, "!");
pos = sentenceText.find('.', pos+1);
}
but i don't know what goes int he while loop. please help. its almost due...

 

[MarkFL]

What does the find method return if the character is not found? You could also do this with a call to the find method in the condition of the while loop only.

By the way, this would be a snap in javascript:

[m]str = str.replace(/\./g, "!");[/m] :D

 

[I like Serena]

By the way, this would also be a snap in javascript:

[m]str = str.replace(/\./g, "!");[/m] :D

If we use QString::replace from the Qt framework, this would be a snap in C++:

[m]str = str.replace(".", "!");[/m] ;)

Unfortunately the std::string from the Standard C++ Library offers a rather limited set of functions.

 

[johng1]

Hi,
Unless this is an exercise in using the member functions of class string, I think a simple traversal of the string is probably better. As an old CS teacher, I believe the idea of traversal (iteration) of a data structure is best learned by first learning to traverse an array. Here's simple code:

void MakeSentenceExcited(string& sentenceText) {
    for (int i=0;i<sentenceText.length();i++) {
        if (string[i]=='.') {
            string[i]='!';
        }
    }
}

Btw, the above code wouldn't work in Java since Java Strings are immutable (const in C++ parlance). Also a Java String s has a method replace which returns a new string. So as above, one can make a one line method call.