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Markus Schmidt 2025-10-21 19:36:38 +02:00
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7
sheet1/B/.vscode/settings.json vendored Normal file
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{
"files.associations": {
"iostream": "cpp",
"ostream": "cpp",
"random": "cpp"
}
}

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sheet1/B/Makefile Normal file
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#
# use GNU-Compiler tools
COMPILER=GCC_
# alternatively from the shell
# export COMPILER=GCC_
# or, alternatively from the shell
# make COMPILER=GCC_
# use Intel compilers
#COMPILER=ICC_
# use PGI compilers
# COMPILER=PGI_
# use CLANG compilers
# COMPILER=CLANG_
SOURCES = main.cpp file_io.cpp means.cpp
OBJECTS = $(SOURCES:.cpp=.o)
PROGRAM = main.${COMPILER}
# uncomment the next to lines for debugging and detailed performance analysis
CXXFLAGS += -g
LINKFLAGS += -g
# do not use -pg with PGI compilers
ifndef COMPILER
COMPILER=GCC_
endif
include ../${COMPILER}default.mk
task:
@pdflatex task
@pdflatex task

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141
261
87
430
258
298
425
120
496
707
244
786
75
394
4
221
2
190
143
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175
139
599
902
940
222
483
377
524
265
69
437
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27
955
431
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763
8
681
706
646
553
219
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229
371
891
857
403
319
609
911
910
592
333
854
443
905
34
533
717
180
337
188
322
404
549
49
553
275
242
244
155
957
936
819
729
176
361
189
2
317
700
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544
440
288
502
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763
577
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124
505
348
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199
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432
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257
10
533
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947
907
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25
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451
583
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720
651
727
374
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58
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615
11
574
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449
570
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643
222
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506
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958
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512
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530
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318
453
753
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110
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525
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292
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640
256
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286
828
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394
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319
134
672
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477
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553
33
54
806
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383
790
365
533
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872
329
651
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588
414
310
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759
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368

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<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<CodeBlocks_project_file>
<FileVersion major="1" minor="6" />
<Project>
<Option title="file_io" />
<Option pch_mode="2" />
<Option compiler="gcc" />
<Build>
<Target title="Debug">
<Option output="bin/Debug/file_io" prefix_auto="1" extension_auto="1" />
<Option object_output="obj/Debug/" />
<Option type="1" />
<Option compiler="gcc" />
<Compiler>
<Add option="-g" />
</Compiler>
</Target>
<Target title="Release">
<Option output="bin/Release/file_io" prefix_auto="1" extension_auto="1" />
<Option object_output="obj/Release/" />
<Option type="1" />
<Option compiler="gcc" />
<Compiler>
<Add option="-O2" />
</Compiler>
<Linker>
<Add option="-s" />
</Linker>
</Target>
</Build>
<Compiler>
<Add option="-Wshadow" />
<Add option="-Winit-self" />
<Add option="-Wunreachable-code" />
<Add option="-pedantic" />
<Add option="-std=c++11" />
<Add option="-Wextra" />
<Add option="-Wall" />
<Add option="-fexceptions" />
</Compiler>
<Unit filename="file_io.cpp" />
<Unit filename="file_io.h" />
<Unit filename="main.cpp" />
<Extensions>
<envvars />
<code_completion />
<lib_finder disable_auto="1" />
<debugger />
<DoxyBlocks>
<comment_style block="0" line="0" />
<doxyfile_project />
<doxyfile_build extract_all="1" />
<doxyfile_warnings />
<doxyfile_output />
<doxyfile_dot />
<general use_at_in_tags="1" />
</DoxyBlocks>
</Extensions>
</Project>
</CodeBlocks_project_file>

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#include "file_io.h"
#include <cassert>
#include <fstream>
#include <iostream>
#include <stdexcept>
#include <string>
#include <vector>
using namespace std;
// [Str10, p.364]
void fill_vector(istream& istr, vector<short>& v)
{
double d=0;
while ( istr >> d) v.push_back(d); // Einlesen
if (!istr.eof())
{ // Fehlerbehandlung
cout << " Error handling \n";
if ( istr.bad() ) throw runtime_error("Schwerer Fehler in istr");
if ( istr.fail() ) // Versuch des Aufraeumens
{
cout << " Failed in reading all data.\n";
istr.clear();
}
}
v.shrink_to_fit(); // C++11
return;
}
void read_vector_from_file(const string& file_name, vector<short>& v)
{
ifstream fin(file_name); // Oeffne das File im ASCII-Modus
if( fin.is_open() ) // File gefunden:
{
v.clear(); // Vektor leeren
fill_vector(fin, v);
}
else // File nicht gefunden:
{
cout << "\nFile " << file_name << " has not been found.\n\n" ;
assert( fin.is_open() && "File not found." ); // exeption handling for the poor programmer
}
return;
}
void write_vector_to_file(const string& file_name, const vector<double>& v)
{
ofstream fout(file_name); // Oeffne das File im ASCII-Modus
if( fout.is_open() )
{
for (unsigned int k=0; k<v.size(); ++k)
{
fout << v.at(k) << endl;
}
}
else
{
cout << "\nFile " << file_name << " has not been opened.\n\n" ;
assert( fout.is_open() && "File not opened." ); // exeption handling for the poor programmer
}
return;
}

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#ifndef FILE_IO_H_INCLUDED
#define FILE_IO_H_INCLUDED
#include <string>
#include <vector>
//using namespace std;
/**
This function opens the ASCII-file named @p file_name and reads the
double data into the C++ vector @p v.
If the file @p file_name does not exist then the code stops with an appropriate message.
@param[in] file_name name of the ASCII-file
@param[out] v C++ vector with double values
*/
void read_vector_from_file(const std::string& file_name, std::vector<short>& v);
/**
This function opens the ASCII-file named @p file_name and rewrites its with the
double data from the C++ vector @p v.
If there are problems in opening/generating file @p file_name
then the code stops with an appropriate message.
@param[in] file_name name of the ASCII-file
@param[in] v C++ vector with double values
*/
void write_vector_to_file(const std::string& file_name, const std::vector<double>& v);
/**
Fills the double-vector @p v with data from an input stream @p istr until this input stream
ends regularily. The vector is cleared and its memory is automatically allocated.
@param[in] istr input stream
@param[out] v C++ vector with double values
@warning An exception is thrown in case of wrong data format or corrupted data.
*/
void fill_vector(std::istream& istr, std::vector<double>& v);
#endif // FILE_IO_H_INCLUDED

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#include "file_io.h"
#include "means.h"
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
using namespace std;
int main()
{
cout << "File einlesen." << endl;
const string name("data_1.txt"); // name of input file
const string name2("out_1.txt"); // name of output file
vector<short> a; //-2^15 to 2^15-1 fits the values from the file
double min, max, ar, ge, ha, std;
read_vector_from_file(name, a);
const unsigned size = a.size();
min = *min_element(a.begin(), a.end());
max = *max_element(a.begin(), a.end());
means_vector(a, ar, ge, ha);
std = 0;
for(unsigned int i = 0; i < size; i++)
{
std += pow(a.at(i)-ar,2);
}
std = sqrt(std/size);
cout << "min: " << min << ", max: " << max << endl;
cout << "Arithmetic mean: " << ar
<< ", geometric mean: " << ge
<< ", harmonic mean: " << ha << endl;
cout << "std: " << std << endl;
vector<double> results = {min, max, ar, ge, ha, std};
write_vector_to_file(name2, results);
return 0;
}

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sheet1/B/means.cpp Normal file
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#include <iostream>
#include <cmath>
#include <vector>
using namespace std;
void means(int a, int b, int c, double &ar, double &ge, double &ha) {
ar = (a+b+c) / 3.0;
ge = pow(a,1.0/3.0) * pow(b,1.0/3.0) * pow(c,1.0/3.0); //do it instead of pow(a*b*c,1.0/3.0) to prevent integer overflow
ha = 3.0 / (1.0/a +1.0/b +1.0/c);
}
void means_vector(const vector<short> &input, double &ar, double &ge, double &ha) {
int size = input.size();
if (size == 0) {
cout << "Empty input" << endl;
return;
}
ar = 0;
ge = 1;
ha = 0;
for (int i = 0; i < size; i++) {
ar += input.at(i);
ge *= pow(input.at(i), 1.0 / size);
ha += 1.0 / input.at(i);
}
ar /= size;
ha = size / ha;
}

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#ifndef MEANS_H_INCLUDED
#define MEANS_H_INCLUDED
#include <vector>
void means(int a, int b, int c, double &ar, double &ge, double &ha);
void means_vector(const std::vector<short> &input, double &ar, double &ge, double &ha);
#endif // MEANS_H_INCLUDED

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sheet1/B/out_1.txt Normal file
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1
1000
498.184
364.412
95.6857
287.905