Code: #include <iostream> #include <vector> #include<conio.h> using namespace std; int main( ) { const int DIFFERENT_NUMBERS = 10; // Prompt for and read number of games. int totalNumbers; cout << "How many numbers to generate?: "; cin >> totalNumbers; // Initialize the vector to zeros. vector <int> numbers( DIFFERENT_NUMBERS + 1,0 ) ; // shorthand for the following code /* for( int i = 0; i < numbers.size( ) ; i++ ) numbers[ i ] = 0; */ // Generate the numbers. for( int j = 0; j < totalNumbers; j++ ) numbers[ rand( ) % DIFFERENT_NUMBERS + 1 ]++ ; // Output the summary. for( int k = 1; k <= DIFFERENT_NUMBERS; k++ ) cout << k << " occurs " << numbers[ k ]<< " time(s) \n"; getch(); } hello , I am having trouble understanding the program from (generate the numbers). please explain it dissecting the code from there ! thnx

The program works this way : (1) Creates a vector that stores the number of repetitions of the generated numbers. number stores the number of times the integer i is generated. (2) This loop basically generates the numbers and keeps track of repetitions : Code: for( int j = 0; j < totalNumbers; j++ ) // Increases the count for the generated number numbers[ rand( ) % DIFFERENT_NUMBERS + 1 ]++ ; All numbers generated are within 1 to 10 (both inclusive). (3) Output section simply shows how many times each number was generated.

thnx, but can u please make me understand : numbers[ rand( ) % DIFFERENT_NUMBERS + 1 ]++ ; for example, the random no. chosen is 5 then wat r the next steps taken.

OK. Let the rand() return 2574. As DIFFERENT_NUMBERS = 10, rand( ) % DIFFERENT_NUMBERS = 4. So, rand( ) % DIFFERENT_NUMBERS + 1 = 4 + 1 = 5. So, the statement finally becomes : numbers[5]++ i.e. the count of '5' increases by one. This is repeated 'totalNumbers' times. Let the user enter 'totalNumbers' as 7. So, 7 random numbers are chosen within 1 ~ 10 : say - 1, 7, 8, 2, 3, 1, 7. So, the numbers array will have the following content : numbers[1] = 2 numbers[2] = 1 numbers[3] = 1 numbers[4] = 0 numbers[5] = 0 numbers[6] = 0 numbers[7] = 2 numbers[8] = 1 numbers[9] = 0 numbers[10] = 0 I hope it's clear now