diff --git a/ex1B_data-IO_and_vectors/Makefile b/ex1B_data-IO_and_vectors/Makefile
new file mode 100644
index 0000000..b854f57
--- /dev/null
+++ b/ex1B_data-IO_and_vectors/Makefile
@@ -0,0 +1,30 @@
+#
+# 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_
+
+
+SOURCES = main.cpp ../ex1A_mean_values/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
diff --git a/ex1B_data-IO_and_vectors/data_1.txt b/ex1B_data-IO_and_vectors/data_1.txt
new file mode 100644
index 0000000..0cc4bb8
--- /dev/null
+++ b/ex1B_data-IO_and_vectors/data_1.txt
@@ -0,0 +1,501 @@
+141
+261
+87
+430
+258
+298
+425
+120
+496
+707
+244
+786
+75
+394
+4
+221
+2
+190
+143
+269
+175
+139
+599
+902
+940
+222
+483
+377
+524
+265
+69
+437
+174
+27
+955
+431
+962
+763
+8
+681
+706
+646
+553
+219
+773
+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
+626
+544
+440
+288
+502
+762
+763
+577
+748
+646
+124
+505
+348
+93
+148
+199
+673
+432
+695
+257
+10
+533
+280
+947
+907
+393
+25
+672
+838
+972
+57
+451
+583
+687
+720
+651
+727
+374
+582
+117
+58
+980
+285
+595
+963
+186
+194
+342
+933
+391
+274
+152
+398
+375
+132
+436
+92
+615
+11
+574
+790
+236
+449
+570
+62
+497
+643
+222
+838
+972
+847
+506
+279
+747
+237
+958
+621
+601
+173
+91
+256
+859
+912
+700
+726
+230
+577
+811
+404
+989
+90
+321
+512
+61
+726
+557
+530
+830
+859
+790
+318
+453
+753
+110
+110
+270
+525
+973
+711
+312
+292
+851
+912
+640
+256
+89
+839
+585
+949
+62
+585
+286
+828
+191
+443
+394
+827
+677
+208
+319
+134
+672
+571
+170
+148
+477
+909
+553
+33
+54
+806
+452
+383
+790
+365
+533
+712
+872
+329
+651
+975
+76
+588
+414
+310
+264
+759
+996
+187
+782
+196
+993
+803
+425
+729
+499
+809
+357
+74
+591
+911
+194
+433
+750
+40
+947
+764
+559
+184
+498
+518
+995
+855
+963
+679
+404
+935
+480
+232
+397
+706
+559
+757
+996
+963
+536
+964
+116
+52
+305
+581
+531
+902
+541
+432
+543
+713
+17
+801
+143
+479
+257
+370
+662
+170
+279
+199
+196
+327
+881
+472
+404
+180
+969
+408
+845
+616
+377
+878
+785
+465
+814
+899
+430
+335
+597
+902
+703
+378
+735
+955
+543
+541
+312
+72
+182
+93
+464
+10
+916
+643
+2
+31
+209
+455
+128
+9
+728
+355
+781
+437
+437
+50
+50
+92
+595
+242
+842
+858
+964
+489
+221
+227
+537
+763
+348
+462
+640
+918
+162
+716
+578
+434
+885
+394
+179
+634
+625
+328
+803
+1000
+981
+128
+233
+24
+608
+111
+408
+885
+549
+370
+209
+441
+957
+125
+471
+857
+44
+692
+979
+284
+134
+686
+910
+611
+900
+194
+755
+347
+419
+156
+820
+625
+739
+806
+68
+951
+498
+756
+743
+832
+157
+458
+619
+933
+836
+896
+583
+583
+855
+35
+886
+408
+37
+747
+155
+144
+606
+255
+325
+402
+407
+387
+610
+167
+189
+95
+324
+770
+235
+741
+693
+825
+828
+294
+310
+524
+326
+832
+811
+557
+263
+681
+234
+457
+385
+539
+992
+756
+981
+235
+529
+52
+757
+602
+858
+989
+930
+410
+1
+541
+208
+220
+326
+96
+748
+749
+544
+339
+833
+553
+958
+893
+357
+547
+347
+623
+797
+746
+126
+823
+26
+415
+732
+782
+368
+
diff --git a/ex1B_data-IO_and_vectors/main.cpp b/ex1B_data-IO_and_vectors/main.cpp
new file mode 100644
index 0000000..0acb48f
--- /dev/null
+++ b/ex1B_data-IO_and_vectors/main.cpp
@@ -0,0 +1,53 @@
+#include "../ex1A_mean_values/means.h"
+#include <iostream>
+#include <fstream>
+#include <cmath>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+
+int main(int argc, char **argv)
+{
+    // read vector from file
+    vector<int> data_vector = {};
+
+    ifstream input_stream("data_1.txt"); 
+
+    int line;
+    while(input_stream >> line)
+    {
+        data_vector.push_back(line);
+    }
+    data_vector.shrink_to_fit();
+
+
+    // calculate minimum and maximum
+    vector<int>::iterator min_it = min_element(data_vector.begin(), data_vector.end());
+    vector<int>::iterator max_it = max_element(data_vector.begin(), data_vector.end());
+
+    // calculate arithmetic mean, geometric mean and harmonic mean
+    double am, gm, hm;
+    calculate_means(data_vector, am, gm, hm);
+
+
+    // calculate standard deviation
+    double sd = 0.;
+    int n = data_vector.size();
+    for (int i = 0; i < n; ++i)
+    {
+        sd += pow(data_vector[i] - am, 2);
+    }
+    sd = sqrt(sd/n);
+
+
+    // print results
+    cout << "minimum: " << *min_it << endl;
+    cout << "maximum: " << *max_it << endl;
+    cout << "arithmetic mean: " << am << endl;
+    cout << "geometric mean: " << gm << endl;
+    cout << "harmonic mean: " << hm << endl;
+    cout << "standard deviation: " << sd << endl;
+
+    return 0;
+}