Question

This assignment is about array operations. You need to count a specific items in an array. Steps to follow are here: . Create an array with 1000 items and fill it with random numbers from the range of -100, 100 (including -100 and 100). In your program asks user to enter a number, K. Search this number and print the frequency (how many) of this K is found in the array. • Ask another number, and so one. The program keeps running until user enters a out-of-range (-100,100) number. An example run is given below.

write c++ program

Answer 1

C++ program to generate random number array and find frequency of a specific number based on user input is given below. It has the following features as per given conditions in the question:

• It creates and array, arr with 1000 items of random numbers between -100 and 100 (including the extremes, -100 and 100).
• It then asks the user for an input number and stores it in variable K.
• It then searches the earlier initialized array arr for the number K and evaluates its frequency and prints it.
• It continues asking the user for a number and prints its frequency until user enters an out-of-range number (i.e. <-100 or >100), in which case it shows a message and exits the program.

C++ code for this program as well as its screenshot and sample output is copied below. Comments have been added in each code block for better comprehension.

#include <iostream>

using namespace std;

int main()
{
    //Declare variables
    int arr[1000];
    int min = -100;
    int max = 100;
    int K, freq;
    
    //Initialize our random number seed
    srand((unsigned) time(0));
    
    //Use for loop to initialize our array with 1000 random numbers
    for(int i=0; i<1000; i++)
        arr[i] = rand()%(max-min + 1) + min;
        
    //Display a message indicating our array is ready
    cout<<"The array with 1000 random items is ready..."<<endl;
    
    //Use an infinite while loop to take user input and show frequency
    while(1)
    {
        cout<<"Enter a number: ";
        cin>>K;
        if(K<-100 || K>100)
        {
            //If user inputs an out-of-range number, exit
            cout<<K<<" is out-of-range number, bye...";
            break;
        }
        else
        {
            //Set freq=0 for every loop
            freq = 0;
            //Use for loop to evaluate num frequency
            for(int i=0; i<1000; i++)
            {
                if(arr[i] == K)
                    freq++;
            }
            //Show freq value to user and continue with next input
            cout<<"Frequency of "<<K<<" is: "<<freq<<endl;
        }
    }
    
    //End of program
    return 0;
}

Code Screenshot:

main.cpp 1 #include <iostream> 2| 3 using namespace std; 4 5 int main() 6 { 7 //Declare variables 8 int arr[1000]; 9 int min = -100; 10 int max = 100; 11 int K, freq; 12 13 //Initialize our random number seed srand((unsigned) time()); 15 16 // Use for Loop to initialize our array with 1000 random numbers 17 for(int i=0; i<1000; i++) 18 arr[i] rand()%(max-min + 1) + min; 19 20 //Display a message indicating our array is ready 21 cout<<"The array with 1000 random items is ready..."<<endl; 14

I/Use an infinite while loop to take user input and show frequency while(1) { cout<<"Enter a number: cin>>K; if(K<-100 || K>100) { //If user inputs an out-of-range number, exit cout<<K<<" is out-of-range number, bye..."; break; main.cpp 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 else } { // Set freq=@ for every Loop freq @; //Use for Loop to evaluate num frequency for(int i=0; i<1000; i++) { if(arr[i] == k) freq++; } //Show freq value to user and continue with next input cout<<"Frequency of "<<K<<" is: "<<freq<<endl; 46 } } 47 48 49 50 51 } //End of program return;

Sample Run Output:

The array with 1000 random items is ready...
Enter a number: 3
Frequency of 3 is: 9
Enter a number: -12
Frequency of -12 is: 2
Enter a number: 19
Frequency of 19 is: 4
Enter a number: 197
197 is out-of-range number, bye...

input The array with 1000 random items is ready... Enter a number: 3 Frequency of 3 is: 9 Enter a number: -12 Frequency of -12 is: 2 Enter a number: 19 Frequency of 19 is: 4 Enter a number: 197 197 is out-of-range number, bye... Program finished with exit code 0 Press ENTER to exit console.

Hope this helps.