Integer array help

[FragO'Matic]

Hello, I am a pretty basic C++ programmer, just a few high school classes, but I am sttempting to write a coding program, I want to make a interger array of a user specified amout of units.


Segment of Code

_________________

cout << "Input Your Code " << endl << endl;

getline (cin, code);

int length = code.length();

int location[length] = {0};

____________________


It is giving me the error that there must be a constant expression in the brackets to create the array. I remember in my class makeing many arrays without having constant varibles to decide the length. My entire code is below, if you see a problem or know an alternate way to make an interger array the same length as the string "code" your help would be very thankful.


*note* Code not complete, and I know the way I'm includeing apstring.h is not very effecient, I am just being lazy for such a small program.
____________________

#include<conio.h>
#include<iostream.h>
#include<apstring.h>
#include<apstring.cpp>

void main(){


int count=0;
int x=0;
int y=0;
apstring code;
char key[5][26] = { {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'},
{'M', 'B', 'C', 'Z', 'L', 'J', 'G', 'D', 'A', 'P', 'I', 'Y', 'R', 'W', 'N', 'V', 'X', 'K', 'H', 'F', 'S', 'O', 'U', 'T', 'E', 'Q'},
{'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'Z', 'X', 'C', 'V', 'B', 'N', 'M'},
{'Z', 'Y', 'X', 'W', 'V', 'U', 'T', 'S', 'R', 'Q', 'P', 'O', 'N', 'M', 'L', 'K', 'J', 'I', 'H', 'G', 'F', 'E', 'D', 'C', 'B', 'A'},
{'F', 'Q', 'J', 'A', 'D', 'W', 'T', 'M', 'H', 'B', 'Z', 'R', 'X', 'O', 'Y', 'P', 'K', 'G', 'C', 'L', 'N', 'S', 'U', 'I', 'V', 'E'}};



cout << "Input Your Code " << endl << endl;

getline (cin, code);

int length = code.length();

cout << endl << length << endl;

int location[length] = {0};

while(count<length){

y=0;
while(y<26){
if(code[count]==key[0][y]){
location[count]=y;

}

y++;
}


count++;
}




return;
}


______________________

Thank You!

[palin]

You are looking at doing something that looks dynamic. You are most likely going to need pointers.

int *array_of_int;

array_of_int = new int[SIZE];

you should also check to make sure that the memory was allocated

if( !array_of_int )
memory was not allocated.

don't forget to delete it later

delete array_of_int;

probably would be best if you read up on pointers

[FragO'Matic]

Thank you for your advice, it is all good advice, but I am still having the same problem when creating my array

[palin]

I would suggest declaring everything at the start of the main function and then using the pointer method.

[joe_bruin]

this line is wrong:

int location[length] = {0};

you cannot initialize a stack-dynamic array. try

int location[length];

[FragO'Matic]

Thank you all very much, the program works fine now!

[Unicorn]

Originally posted by palin

don't forget to delete it later

delete array_of_int;

Also, don't forget it's an array.

delete [] array_of_int;