Чисто на функциях в императивном стиле, без всяких классов, STL и без C++11:
main.cpp
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| #include "arrays_functions.h"
#include <iostream>
#include <cstdlib>
int main()
{
size_t row_size;
size_t col_size;
get_number_from_user( "Enter number of rows: ", row_size );
get_number_from_user( "Enter number of columns: ", col_size );
int ** matrix = create( row_size, col_size );
const size_t from_num = 10;
const size_t to_num = 99;
fill_rand( matrix, row_size, col_size, from_num, to_num );
show( matrix, row_size, col_size );
size_t arr_size;
get_number_from_user( "Enter size of array: ", arr_size );
int * array = create( arr_size );
const size_t begin_row_index = 0;
const size_t begin_col_index = 0;
fill_array_from_part_of_matrix
(
array,
arr_size,
matrix,
row_size,
col_size,
begin_row_index,
begin_col_index
);
show( array, arr_size );
std::cout
<< "Arithmetic mean of array's values is: "
<< calc_arithm_mean( array, arr_size );
destroy( matrix, row_size );
destroy( array );
return 0;
} |
|
arrays_functions.h
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| #ifndef ARRAYS_FUNCTIONS_H
#define ARRAYS_FUNCTIONS_H
#include <cstdlib>
#include <string>
// Function prototypes to handle 1-dimensional arrays:
//--------------------------------------------------
int * create
(
const size_t arr_size
);
//--------------------------------------------------
void destroy
(
int * array
);
//--------------------------------------------------
void fill_rand
(
int * array,
const size_t arr_size,
const int from_num,
const int to_num
);
//--------------------------------------------------
void show
(
int * array,
const size_t arr_size
);
//--------------------------------------------------
int calc_sum_of_values
(
int * array,
const size_t arr_size
);
//--------------------------------------------------
int calc_arithm_mean
(
int * array,
const size_t arr_size
);
// Function prototypes to handle matrices:
//--------------------------------------------------
int ** create
(
const size_t row,
const size_t col
);
//--------------------------------------------------
void destroy
(
int ** matrix,
const size_t row
);
//--------------------------------------------------
void fill_rand
(
int ** matrix,
const size_t row,
const size_t col,
const int from_num,
const int to_num
);
//--------------------------------------------------
void show
(
int ** matrix,
const size_t row,
const size_t col
);
//--------------------------------------------------
int calc_sum_of_values
(
int ** matrix,
const size_t row,
const size_t col
);
//--------------------------------------------------
int calc_arithm_mean
(
int ** matrix,
const size_t row,
const size_t col
);
// Other function prototypes:
//--------------------------------------------------
void get_number_from_user
(
std::string promt,
size_t & number
);
//--------------------------------------------------
void fill_array_from_part_of_matrix
(
int * array,
const size_t arr_size,
int ** matrix,
const size_t row,
const size_t col,
const size_t begin_row_index,
const size_t begin_col_index
);
#endif // ARRAYS_FUNCTIONS_H |
|
arrays_functions.cpp
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| #include "arrays_functions.h"
#include <iostream>
#include <ctime>
// Function implementations to handle 1-dimensional arrays:
//--------------------------------------------------
int * create
(
const size_t arr_size
)
{
int * array = new int[arr_size];
return array;
}
//--------------------------------------------------
void destroy
(
int * array
)
{
delete [] array;
}
//--------------------------------------------------
void fill_rand
(
int * array,
const size_t arr_size,
const int from_num,
const int to_num
)
{
static bool first_time_in_this_program = true;
if ( first_time_in_this_program )
{
srand( time( NULL ) );
first_time_in_this_program = false;
}
for ( size_t i = 0; i < arr_size; ++i )
array[i] = rand() % (to_num - from_num) + from_num;
}
//--------------------------------------------------
void show
(
int * array,
const size_t arr_size
)
{
std::cout << "\n";
for ( size_t i = 0; i < arr_size; ++i )
{
std::cout << array[i] << " ";
}
std::cout << "\n\n";
}
//--------------------------------------------------
int calc_sum_of_values
(
int * array,
const size_t arr_size
)
{
int sum = 0;
for ( size_t i = 0; i < arr_size; ++i )
sum += array[i];
return sum;
}
//--------------------------------------------------
int calc_arithm_mean
(
int * array,
const size_t arr_size
)
{
int sum = calc_sum_of_values( array, arr_size );
return sum / arr_size;
}
// Function implementations to handle matrices:
//--------------------------------------------------
int ** create
(
const size_t row,
const size_t col
)
{
int ** matrix = new int * [row];
for ( size_t i = 0; i < row; ++i )
matrix[i] = new int[col];
return matrix;
}
//--------------------------------------------------
void destroy
(
int ** matrix,
const size_t row
)
{
for ( size_t i = 0; i < row; ++i )
delete [] matrix[i];
delete [] matrix;
}
//--------------------------------------------------
void fill_rand
(
int ** matrix,
const size_t row,
const size_t col,
const int from_num,
const int to_num
)
{
static bool first_time_in_this_program = true;
if ( first_time_in_this_program )
{
srand( time( NULL ) );
first_time_in_this_program = false;
}
for ( size_t i = 0; i < row; ++i )
for ( size_t j = 0; j < col; ++j )
matrix[i][j] = rand() % (to_num - from_num) + from_num;
}
//--------------------------------------------------
void show
(
int ** matrix,
const size_t row,
const size_t col
)
{
std::cout << "\n";
for ( size_t i = 0; i < row; ++i )
{
for ( size_t j = 0; j < col; ++j )
{
std::cout << matrix[i][j] << " ";
}
std::cout << "\n";
}
std::cout << "\n";
}
//--------------------------------------------------
int calc_sum_of_values
(
int ** matrix,
const size_t row,
const size_t col
)
{
int sum = 0;
for ( size_t i = 0; i < row; ++i )
for ( size_t j = 0; j < col; ++j )
sum += matrix[i][j];
return sum;
}
//--------------------------------------------------
int calc_arithm_mean
(
int ** matrix,
const size_t row,
const size_t col
)
{
int sum = calc_sum_of_values( matrix, row, col );
return sum / (row * col);
}
// Other function implementations:
//--------------------------------------------------
void get_number_from_user
(
std::string promt,
size_t & number
)
{
std::cout << promt;
std::cin >> number;
}
//--------------------------------------------------
void fill_array_from_part_of_matrix
(
int * array,
const size_t arr_size,
int ** matrix,
const size_t row,
const size_t col,
const size_t begin_row_index,
const size_t begin_col_index
)
{
for ( size_t i = begin_row_index, k = 0; i < row; ++i )
{
for
(
size_t j = begin_col_index;
j < col && k < arr_size;
++j, ++k
)
{
array[k] = matrix[i][j];
}
}
} |
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