Question

Program in C++! Thank you in advance!

Write a menu based program implementing the following functions:

(1) Write a function that prompts the user for the name of a file to output as a text file that will hold a two dimensional array of the long double data type.

Have the user specify the number of rows and the number of columns for the two dimensional array.

Have the user enter the values for each row and column element in the two dimensional array.

Write the two dimensional array out as a text file. You will want the file format to be as follows:

• The first two values stored in the file is the number of rows and the number of columns.
• The remaining data is to be the two dimensional array being stored as long double typed values.

(2) Write a function like function #1, except in this time, instead of asking the user for the values for each row and column element, have the function create a randomly generated values for the row and column elements. Have the function that prompt the user for the name of a file to output as a text file, the randomly generated values between the numbers 0 and 1 such as 0.036757, 0.45425676, etc (inclusively - means to include 0 and 1). Hint: you may want to have your program generate two random numbers and divide the smaller of the two random numbers into the larger random number.

You will want the file format to be as follows:

• The first two values stored in the file is the number of rows and the number of columns.
• The remaining data is to be the two dimensional array being stored as long double typed values.

(3) Write a function to prompt the user for the name of a file to input as a text file to read in the two dimensional array of long double type.

Output the contents of the two dimensional array to the screen.

(4) Write a function to prompt the user for the name of a file to read in as a two dimensional array of the long double type and another filename for the name of the output file that will be outputting the two dimensional array after it has been sorted.

Load in the data from the original text file and ask the user which column would they like to sort by.

Sort the two dimensional array based on the column the user specifies, and output the sorted two dimensional array to the output filename.

(5) Write a function to prompt the user for the name of a file to input as a text file to read in the two dimensional array of long double data type.

Load in the data for the two dimensional array.

Prompt the user to enter the column they wish to search by, and the value to find. Implement the binary search algorithm to find the value (remember, the column they specify must be sorted or binary search may not always work).

Answer 1

Here is the required code;

#include<iostream>
#include<fstream>
#include<time.h>
using namespace std;
int main()
{
srand(time(0));
int c;
do{
cout<<"\nMenu";
cout<<"\n1. write user data into a file ";
cout<<"\n2. write random data into a file";
cout<<"\n3. read data from the file";
cout<<"\n4. perform sort by on 2d array";
cout<<"\n5. find an element in sorted 2d array";
cout<<"\n6. Quit\n";
cin>>c;
switch(c)
{
case 1:{
string file;
cout<<"\n enter the file name: ";
cin>>file;
ofstream f;
f.open(file);
int row,col;
  
cout<<"\n enter the row and column of the array: ";
cin>>row>>col;
f<<row<<" "<<col<<"\n";
double ar[row][col];
for(int i=0;i<row;i++)
{
for(int j=0;j<col;j++)
{
cin>>ar[i][j];
f<<ar[i][j]<<" ";
}
f<<"\n";
}
break;}
case 2:{
string file;
cout<<"\n enter the file name: ";
cin>>file;
ofstream f;
f.open(file);
int row,col;
  
cout<<"\n enter the row and column of the array: ";
cin>>row>>col;
f<<row<<" "<<col<<"\n";
  
for(int i=0;i<row;i++)
{
for(int j=0;j<col;j++)
{
double ab=rand()%100000;
double ba=rand()%100000;
if(ab<ba)
f<<ab/ba<<" ";
else
f<<ba/ab<<" ";
}
f<<"\n";
}
break;}
case 3:{
string file;
cout<<"\n enter the file name: ";
cin>>file;
ifstream f;
f.open(file);
int row,col;
f>>row>>col;
cout<<"\n data is\n";
for(int i=0;i<row;i++)
{
for(int j=0;j<col;j++)
{
double ab;
f>>ab;
cout<<ab<<" ";
}
cout<<"\n";
}
break;}
case 4:{
string file1,file2;
cout<<"\nenter the file name from which data to be taken: ";
cin>>file1;
cout<<"\n enter the file name in which sorted data to be stored: ";
cin>>file2;
ifstream f;
f.open(file1);
int row,col;
f>>row>>col;
double ar[row][col];
int i,j;
for(i=0;i<row;i++)
{
for( j=0;j<col;j++)
{
f>>ar[i][j];
  
}
  
}
int colsort;
cout<<"\nenter the column no.( starting from 0 to "<<col-1<<" )";
cin>>colsort;

for (i = 0; i < row-1; i++)   
  
// Last i elements are already in place
for (j = 0; j < row-i-1; j++)
if (ar[j][colsort] > ar[j+1][colsort])
{
for(int k=0;k<col;k++)
{
swap(ar[j][k],ar[j+1][k]);
}
}
f.close();
ofstream ff;
ff.open(file2);
ff<<row<<" "<<col<<"\n";
for(i=0;i<row;i++)
{
for( j=0;j<col;j++)
{
  
ff<<ar[i][j]<<" ";
}
ff<<"\n";
}
break;}
case 5:{
string file;
cout<<"\n enter the name of the file in which data to be find: ";
cin>>file;
ifstream f;
f.open(file);
int colno;
cout<<"\n enter the column no. in which data to be find: ";
cin>>colno;
int element;
cout<<"\n enter the element to be found: ";
cin>>element;
int row,col;
f>>row>>col;
double ar[row][col];
int i,j;
for(i=0;i<row;i++)
{
for( j=0;j<col;j++)
{
f>>ar[i][j];
  
}
  
}
int l=0,r=row-1;
int flag=1;
while (l <= r) {
int m = l + (r - l) / 2;
  
// Check if element is present at mid
if (ar[m][colno] == element){
cout<<"\nelement found at row :"<<m;
flag=0;
}
  
// If element greater, ignore left half
if (ar[m][colno] < element)
l = m + 1;
  
// If element is smaller, ignore right half
else
r = m - 1;
}
if(flag)
cout<<"\nelement not found\n";
break;}
case 6:break;
default:{
cout<<"\nenter write choice please\n";
break;
}
}
}while(c!=6);
}

here is the ss of the output

PS D:\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin> ./a.exe Menu 1. write user data into a file 2. write random data into a file 3. read data from the file 4. perform sort by on 2d array 5. find an element in sorted 2d array 6. Quit 5 enter the name of the file in which data to be find: aa.txt enter the column no. in which data to be find: 3 enter the element to be found: 4 element found at row :1 Menu 1. write user data into a file 2. write random data into a file 3. read data from the file 4. perform sort by on 2d array 5. find an element in sorted 2d array 6. Quit

I hope this will help you so please give positive ratings ::)))

sorry due to lack of time i've not posted complete output but you can generate your output