need help with return char array

[finalazy]

Hi guys,

I'm currently learning pointer with array but i'm stuck at some point. Can someone guide me along which part of the code did I miss or did wrongly.

This is my code.


#include <iostream>

using namespace std;

void printPattern(char* message)
{
int length = strlen(message);
for(int i=0;i<=length;i++) {

*message=i;
message+=1;
cout<<message<<endl;
}
}

int main(int argc, char* argv[]) {
char string1[] = "Application of C++";
printPattern(string1);

system("pause");
return 0;

}


It is actually working but not how I wanted it to be. Right now it is reducing each letter after a loop and at the ending, it show up with some weird characters. What I would want is it start off with 1 letter as the 1st line, follow by 2 letter at the 2nd line, and so on until it finishes the char[] which I had define in the main.

As for the weird character that shows up, from my understanding is that it is due to the NULL character therefore I would like to terminate the char array when it encounters the NULL.

I appreciate if someone can guide me on this =D

[o3hC5Di1]

Hi there,

Your weird character most likely comes from this:

for(int i=0;i<=length;i++)

length is the amount of characters in the string. Arrays however are zero indexed, which means thatthey start counting at 0. So the first element of the array is array[0]. So you only need to loop until length-1:

for(int i=0;i<length;i++)


As for accessing the character you can just do this:

for(int i=0;i<length;i++) 
    cout<<message[i]<<endl;

Hope that helps.

All the best,
NwN

[finalazy]

Hi NwN!

Thank you so much for your tips. After taking away the = sign at the for loop, the weird character is indeed gone. =D

However for the next part which you gave which is the message[I], by doing this it only print 1 letter on each line. what I would like is something like this.

A
Ap
App
Appl
Appli
.............


Do you have any idea how can I code this to get this kind of result?
Once again thank you so much for the help!

[o3hC5Di1]

Hi there,

My apologies, I misunderstood, I thought you wanted each letter of the word on a new line.
You will need to use a nested for loop. The first for loop takes care of the lines, the next of the characters:

for (int i=0; i<length; ++i) //for every character, write a line
{
    for (int j=0; j<=i; ++j) //for every character up to the one which "line" we're on
        std::cout << array[j];

    std::cout << std::endl; //start new line
}

Hope that makes sense.

All the best,
NwN

[finalazy]

Hi NwN,

Arr~! yes I was thinking whether is it a nested for loop that I miss out. hee. thanks a lot I will try it out =D

[finalazy]

yea! it works! thanks so much for the help NwN ^^

[o3hC5Di1]

Most welcome, glad it works :)

NwN