How to remove first element in multidimentional array?

Help adding numbers to an array and printing them?

• For this program I want to: 1) Create an array dynamically with the requested size. 2) Every time I read in a new number, check first to see if it is already in the array. If so, discard the number and ask for the next number. If not in the array, place the number in the array. 3)Use a counter to count how many numbers you have added to the array. Use this counter to compute the array index of the next number to add to the array. 4) Print the numbers in the array This is the code I have so far, any ideas on where I am going wrong? #include <iostream> using namespace std; bool compare(int arrayNum[],int arraySize,int element) { for (int i = 0; i < arraySize; i++) { if(arrayNum[i]==element) return false; } return true; } int main() { cout << "How many numbers?" << endl; int n; cin >> n; int *num = new int [ n ]; int arrayElement; int count = 0; int i = 1; cout << "Please input " << n << " numbers: " << endl; cin >> arrayElement; //while ( i <= n) //int list = 0; if ( i == 1) num[0] = arrayElement; else if (compare(num, n ,arrayElement)) { count++; num[count]=arrayElement; } i++; //displays array elements for (int j = 0; j <= count ;j++) cout<<num[j]<<endl; return 0;

• Answer:

  A few things: . you don't need a special case for the first number added to the array . your display loop goes too far, it should be while j < count, not <= . I'd like to see some user input validation . the function 'compare' should have a better name . I don't like multiple returns in a function In real life, an STL set<int> can do a lot of this work for you, but I'm guessing this is an exercise where you need to code the logic yourself. So, here are some improvements I'd recommend: #include <iostream> #include <string> #include <sstream> using namespace std; int getInt(const string &prompt); bool isInArray(int arrayNum[],int arraySize, int element) {   bool found = false;   for (int i = 0; i < arraySize; i++) {     if ((found = (arrayNum[i] == element)) == true) {       break;     }   }   return found; } int main(int argc, char *argv[]) {   int n, *num, arrayElement, count = 0;     do {     n = getInt("How many numbers? : ");   } while (n < 1);   num = new int[n];   cout << "Please input " << n << " numbers: " << endl;   for (int i = 0; i < n; i++) {     if (isInArray(num, count, arrayElement = getInt("> ")) == false) {         num[count++] = arrayElement;     }   }   cout << "Unique numbers entered: " << endl;   for (int j = 0; j < count; j++) {     cout << num[j] << endl;   }   return 0; } int getInt(const string &prompt) {   stringstream ss;   string line;   bool inputOk = false;   int n;   do {     cout << prompt;     getline(cin,line);     ss.clear(); ss.str(line);     if ((!(ss >> n)) || (ss.good())) {       cout << "invalid input, try again" << endl;     } else {       inputOk = true;     }   } while (inputOk == false);   return n; }