File i/o and vectors
The videos below demonstrate the use of file
input and output. Also included are demonstrations of the use of
vectors. Examples are taken from Bruce Eckel's free online book,
Thinking in C++, and from Dawson's Beginning C++
book.
line-by-line copying of a file
scopy.cpp
reading a whole file into one string
fill_string.cpp
A new version of Hero's Inventory with a vector
heros_inventory2.cpp
reading a file into a vector
fill_vector.cpp
getting whitespace-separated words
from a file
get_words.cpp
a vector with elements of type int
int_vector.cpp
Exercises
Complete these exercises from
Thinking in
C++, 2nd edition, Volume 1:
- Create a program that opens a file and counts the
whitespace-separated words in that file.Create a program that counts
the occurrence of a particular word in a file (use the string class's
operator '==' to find the word).
- Change fill_vector.cpp so that it prints the lines
(backwards) from last to first.
- Change fill_vector.cpp so that it concatenates all
the elements in the vector into a single string before printing it out,
but don't try to add line numbering.
- Display a file a line at a time, waiting for the user
to press the "Enter" key after each line.
- Create a vector<float> and put 25
floating-point numbers into it using a for loop. Display the vector.
- Create three vector<float> objects and
fill the first two as in the previous exercise. Write a for loop that
adds each corresponding element in the first two vectors and puts the
result in the corresponding element of the third vector. Display all
three vectors.
- Create a vector<float> and put 25
numbers into it as in the previous exercises. Now square each number
and put the result back into the same location in the vector. Display
the vector before and after the multiplication.
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