Random number seed
Good afternoon all,
My program asks the user for a file, reads the file, creates a new file, generates 5 additional numbers ,adds these numbers plus the old numbers to the new file. I would like to know how to show the random number seed. I have left it blank where I would like it to show the seed.
Thank you for your time
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;
void sortArray( int ary[], int size)
{
for ( int i = 0;i < size;i++)
for ( int j = 1; j < size - i;j++)
if (ary[j-1] > ary[j])
{
int temp = ary[j-1];
ary[j-1] = ary[j];
ary[j] = temp;
}
}
int main()
{
string ifilename, ofilename, line;
ifstream inFile, checkOutFile;
ofstream outFile;
char response;
int ary [10];
cout << "Please enter the name of the file you wish to open : " ;
cin >> ifilename;
inFile.open(ifilename.c_str());
if (inFile.fail())
{
cout << "The file " << ifilename << " was not successfully opened." << endl;
cout << "Please check the path and name of the file. " << endl;
exit(1);
}
else
{
cout << "The file is successfully opened." << endl;
}
cout << "Please enter the name of the file you wish to write : " ;
cin >> ofilename;
checkOutFile.open(ofilename.c_str());
if (!checkOutFile.fail())
{
cout << "A file " << ofilename << " exists.\nDo you want to continue and overwrite it? (y/n) : " ;
cin >> response;
if (tolower(response) == 'n' )
{
cout << "The existing file will not be overwritten. " << endl;
exit(1);
}
}
outFile.open(ofilename.c_str());
if (outFile.fail())
{
cout << "The file " << ofilename << " was not successfully opened." << endl;
cout << "Please check the path and name of the file. " << endl;
exit(1);
}
else
{
cout << "The file is successfully opened." << endl;
}
cout << "The original list : " << endl;
outFile << "The original list : " << endl;
for ( int i = 0; i < 5;i++){
inFile >> ary[i];
outFile << ary[i] << "\n" ;
cout << ary[i] << endl;
}
cout << "The random number seed :" << endl;
outFile << "The random number seed :" << endl;
cout << "The generated numbers : " << endl;
outFile << "The generated numbers : " << endl;
for ( int i = 0;i < 5;i++)
{
ary[i+5] = rand() % 1000;
outFile << ary[i+5] << "\n" ;
cout << ary[i+5] << endl;
}
cout << endl;
srand(14792);
sortArray(ary,10);
cout << "The merged list : " << endl;
outFile << "The merged list : " << endl;
for ( int i = 0; i < 10; i++)
{
cout << ary[i] << endl;
outFile << ary[i] << "\n" ;
}
while (getline(inFile, line))
{
cout << line << endl;
outFile << line << endl;
}
inFile.close();
outFile.close();
int test;
cin >> test;
}
My program asks the user for a file, reads the file, creates a new file, generates 5 additional numbers ,adds these numbers plus the old numbers to the new file. I would like to know how to show the random number seed. I have left it blank where I would like it to show the seed.
Thank you for your time
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;
void sortArray( int ary[], int size)
{
for ( int i = 0;i < size;i++)
for ( int j = 1; j < size - i;j++)
if (ary[j-1] > ary[j])
{
int temp = ary[j-1];
ary[j-1] = ary[j];
ary[j] = temp;
}
}
int main()
{
string ifilename, ofilename, line;
ifstream inFile, checkOutFile;
ofstream outFile;
char response;
int ary [10];
cout << "Please enter the name of the file you wish to open : " ;
cin >> ifilename;
inFile.open(ifilename.c_str());
if (inFile.fail())
{
cout << "The file " << ifilename << " was not successfully opened." << endl;
cout << "Please check the path and name of the file. " << endl;
exit(1);
}
else
{
cout << "The file is successfully opened." << endl;
}
cout << "Please enter the name of the file you wish to write : " ;
cin >> ofilename;
checkOutFile.open(ofilename.c_str());
if (!checkOutFile.fail())
{
cout << "A file " << ofilename << " exists.\nDo you want to continue and overwrite it? (y/n) : " ;
cin >> response;
if (tolower(response) == 'n' )
{
cout << "The existing file will not be overwritten. " << endl;
exit(1);
}
}
outFile.open(ofilename.c_str());
if (outFile.fail())
{
cout << "The file " << ofilename << " was not successfully opened." << endl;
cout << "Please check the path and name of the file. " << endl;
exit(1);
}
else
{
cout << "The file is successfully opened." << endl;
}
cout << "The original list : " << endl;
outFile << "The original list : " << endl;
for ( int i = 0; i < 5;i++){
inFile >> ary[i];
outFile << ary[i] << "\n" ;
cout << ary[i] << endl;
}
cout << "The random number seed :" << endl;
outFile << "The random number seed :" << endl;
cout << "The generated numbers : " << endl;
outFile << "The generated numbers : " << endl;
for ( int i = 0;i < 5;i++)
{
ary[i+5] = rand() % 1000;
outFile << ary[i+5] << "\n" ;
cout << ary[i+5] << endl;
}
cout << endl;
srand(14792);
sortArray(ary,10);
cout << "The merged list : " << endl;
outFile << "The merged list : " << endl;
for ( int i = 0; i < 10; i++)
{
cout << ary[i] << endl;
outFile << ary[i] << "\n" ;
}
while (getline(inFile, line))
{
cout << line << endl;
outFile << line << endl;
}
inFile.close();
outFile.close();
int test;
cin >> test;
}
You can seed it with whatever you want. You probably want to do that before calling rand().
In your program, you invoke srand(14792). So you could say, int seed = 14792; srand(seed); cout << seed;
In your program, you invoke srand(14792). So you could say, int seed = 14792; srand(seed); cout << seed;
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