C++ For Engineers and Scientist 5.5 #12 (Numerical) Write a program that tests t

Question

C++ For Engineers and Scientist

5.5 #12

(Numerical) Write a program that tests the effectiveness of the rand() library function. Start by initializing 10 counters, such as zerocount, onecount, twocount, and so forth to 0. Then generate a large number of pseudorandom integers between 0 and 9. Each time a 0 occurs, increment the variable you have designated as the zero counter; when a 1 occurs, increment zerocount; when 1 occurs , increment onecount; and so on. Finally, display the number of 0s, 1s, 2s, and so on that occurred and the percentage of the time they occurred.

Explanation / Answer

// C++ code
#include <iostream>
#include <cmath>
#include <fstream>
#include <stdlib.h>
using namespace std;

int main ()
{
   int zerocount= 0,onecount= 0,twocount= 0,threecount= 0,fourcount= 0,fivecount= 0,sixcount= 0,sevencount= 0,eightcount= 0,ninecount= 0;
   int number;
   int total = 0;
   // generating 10000 randomm numbers
   for (int i = 0; i < 100000; ++i)
   {
       number = rand()%10;

       if(number == 0) zerocount++;
       else if(number == 1) onecount++;
       else if(number == 2) twocount++;
       else if(number == 3) threecount++;
       else if(number == 4) fourcount++;
       else if(number == 5) fivecount++;
       else if(number == 6) sixcount++;
       else if(number == 7) sevencount++;
       else if(number == 8) eightcount++;
       else if(number == 9) ninecount++;  

   }

   total = zerocount+onecount+twocount+threecount+fourcount+fivecount+sixcount+sevencount+eightcount+ninecount;

   cout << "0s : " << zerocount << " percentage of zero: " << 100*zerocount/(01.0*total) << "%" << endl;
   cout << "1s : " << onecount << " percentage of zero: " << 100*onecount/(01.0*total) << "%" << endl;
   cout << "2s : " << twocount << " percentage of zero: " << 100*twocount/(01.0*total) << "%" << endl;
   cout << "3s : " << threecount << " percentage of zero: " << 100*threecount/(01.0*total) << "%" << endl;
   cout << "4s : " << fourcount << " percentage of zero: " << 100*fourcount/(01.0*total) << "%" << endl;
   cout << "5s : " << fivecount << " percentage of zero: " << 100*fivecount/(01.0*total) << "%" << endl;
   cout << "6s : " << sixcount << " percentage of zero: " << 100*sixcount/(01.0*total) << "%" << endl;
   cout << "7s : " << sevencount << " percentage of zero: " << 100*sevencount/(01.0*total) << "%" << endl;
   cout << "8s : " << eightcount << " percentage of zero: " << 100*eightcount/(01.0*total) << "%" << endl;
   cout << "9s : " << ninecount << " percentage of zero: " << 100*ninecount/(01.0*total) << "%" << endl;
   return 0;
}

/*
output:

0s : 10130   percentage of zero: 10.13%
1s : 10072   percentage of zero: 10.072%
2s : 9990   percentage of zero: 9.99%
3s : 9842   percentage of zero: 9.842%
4s : 10174   percentage of zero: 10.174%
5s : 9930   percentage of zero: 9.93%
6s : 10059   percentage of zero: 10.059%
7s : 9954   percentage of zero: 9.954%
8s : 9891   percentage of zero: 9.891%
9s : 9958   percentage of zero: 9.958%

*/

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