the error in the code is the plus (+) sign is unrecognized as an identifier
the plus(+) operator is a operator but you aren't using it in the correct context

to fix it delete the multidimensional array declaration because its not needed

next delete:
     multi_array[i][j] = i + point + j ; // assigns value to the array

now replace:
     cout <<multi_array[i][j] <<endl; //displays array
with:
     cout << "[" << i << "," << j << "] "; //displays array

and because you want it to look like a matrix in the output move the endl to the end of the SECOND for statement

so you code should look like this:


/* program: multi dimensional array
 * description: creates a multi dimensional array, whose size the user inputs
 */

#include <iostream>
#include <string>

using namespace std;


int main(){
    int first_dimension; //legnth of first dimension
    int second_dimension; //length of second dimension

    //iterating variables
    int i;
    int j;

    //decimal point
    string point = ".";

    cout <<"What size do you want the first dimension to be." <<endl;
    cin >>first_dimension; //input length of first dimension

    cout <<"What size do you want the second dimension to be." <<endl;
    cin >>second_dimension; //inputs length of second dimension
    cout <<"---------------------------------------" <<endl;

    //nested for loops to iterate through the array
    for(i = 0; i < first_dimension; i++){
        for(j = 0; j < second_dimension; j++){
            cout << "[" << i << "," << j << "] "; //displays array
        }
        cout << endl;
    }

    return 0;
}


Geo121