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C & C++ Multimedia Cyber Classroom
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C and C++ Multimedia Cyber Classroom (Prentice Hall) (1998).iso
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src
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fig04_17.jar
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Ch04
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Fig04_17
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Fig04_17.cpp
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C/C++ Source or Header
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1997-10-13
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4KB
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134 lines
// Fig. 4.17: fig04_17.cpp
// This program introduces the topic of survey data analysis.
// It computes the mean, median, and mode of the data.
#include <iostream.h>
#include <iomanip.h>
void mean( const int [], int );
void median( int [], int );
void mode( int [], int [], int );
void bubbleSort( int[], int );
void printArray( const int[], int );
int main()
{
const int responseSize = 99;
int frequency[ 10 ] = { 0 },
response[ responseSize ] =
{ 6, 7, 8, 9, 8, 7, 8, 9, 8, 9,
7, 8, 9, 5, 9, 8, 7, 8, 7, 8,
6, 7, 8, 9, 3, 9, 8, 7, 8, 7,
7, 8, 9, 8, 9, 8, 9, 7, 8, 9,
6, 7, 8, 7, 8, 7, 9, 8, 9, 2,
7, 8, 9, 8, 9, 8, 9, 7, 5, 3,
5, 6, 7, 2, 5, 3, 9, 4, 6, 4,
7, 8, 9, 6, 8, 7, 8, 9, 7, 8,
7, 4, 4, 2, 5, 3, 8, 7, 5, 6,
4, 5, 6, 1, 6, 5, 7, 8, 7 };
mean( response, responseSize );
median( response, responseSize );
mode( frequency, response, responseSize );
return 0;
}
void mean( const int answer[], int arraySize )
{
int total = 0;
cout << "********\n Mean\n********\n";
for ( int j = 0; j < arraySize; j++ )
total += answer[ j ];
cout << "The mean is the average value of the data\n"
<< "items. The mean is equal to the total of\n"
<< "all the data items divided by the number\n"
<< "of data items (" << arraySize
<< "). The mean value for\nthis run is: "
<< total << " / " << arraySize << " = "
<< setiosflags( ios::fixed | ios::showpoint )
<< setprecision( 4 ) << ( float ) total / arraySize
<< "\n\n";
}
void median( int answer[], int size )
{
cout << "\n********\n Median\n********\n"
<< "The unsorted array of responses is";
printArray( answer, size );
bubbleSort( answer, size );
cout << "\n\nThe sorted array is";
printArray( answer, size );
cout << "\n\nThe median is element " << size / 2
<< " of\nthe sorted " << size
<< " element array.\nFor this run the median is "
<< answer[ size / 2 ] << "\n\n";
}
void mode( int freq[], int answer[], int size )
{
int rating, largest = 0, modeValue = 0;
cout << "\n********\n Mode\n********\n";
for ( rating = 1; rating <= 9; rating++ )
freq[ rating ] = 0;
for ( int j = 0; j < size; j++ )
++freq[ answer[ j ] ];
cout << "Response"<< setw( 11 ) << "Frequency"
<< setw( 19 ) << "Histogram\n\n" << setw( 55 )
<< "1 1 2 2\n" << setw( 56 )
<< "5 0 5 0 5\n\n";
for ( rating = 1; rating <= 9; rating++ ) {
cout << setw( 8 ) << rating << setw( 11 )
<< freq[ rating ] << " ";
if ( freq[ rating ] > largest ) {
largest = freq[ rating ];
modeValue = rating;
}
for ( int h = 1; h <= freq[ rating ]; h++ )
cout << '*';
cout << '\n';
}
cout << "The mode is the most frequent value.\n"
<< "For this run the mode is " << modeValue
<< " which occurred " << largest << " times." << endl;
}
void bubbleSort( int a[], int size )
{
int hold;
for ( int pass = 1; pass < size; pass++ )
for ( int j = 0; j < size - 1; j++ )
if ( a[ j ] > a[ j + 1 ] ) {
hold = a[ j ];
a[ j ] = a[ j + 1 ];
a[ j + 1 ] = hold;
}
}
void printArray( const int a[], int size )
{
for ( int j = 0; j < size; j++ ) {
if ( j % 20 == 0 )
cout << endl;
cout << setw( 2 ) << a[ j ];
}
}