JamesFlare/CSCI-1200
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

line breaks

Browse Source
This commit is contained in:
Jidong Xiao
2025-01-10 13:25:02 -05:00
parent 5973c72fc6
commit a3b4b64e39
1 changed files with 6 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
lectures/02_strings_vectors/README.md
View File

@@ -55,21 +55,22 @@ where h is as defined above.
std::vector<int> scores; std::vector<int> scores;
``` ```
- Vectors are an example of a templated container class. The angle brackets < > are used to specify the type of object (the “template type”) that will be stored in the vector. - Vectors are an example of a templated container class. The angle brackets < > are used to specify the type of object (the “template type”) that will be stored in the vector.
- push back is a vector function to append a value to the end of the vector, increasing its size by one. <!--This is an O(1) operation (on average).--> - push_back is a vector function to append a value to the end of the vector, increasing its size by one. <!--This is an O(1) operation (on average).-->
– There is NO corresponding push front operation for vectors. - There is NO corresponding push_front operation for vectors.
- size is a function defined by the vector type (the vector class) that returns the number of items stored in the vector. - size is a function defined by the vector type (the vector class) that returns the number of items stored in the vector.
- After vectors are initialized and filled in, they may be treated just like arrays. - After vectors are initialized and filled in, they may be treated just like arrays.
– In the line - In the line
```cpp ```cpp
sum += scores[i]; sum += scores[i];
``` ```
scores[i] is an “r-value”, accessing the value stored at location i of the vector. scores[i] is an “r-value”, accessing the value stored at location i of the vector.
– We could also write statements like
- We could also write statements like
```cpp ```cpp
scores[4] = 100; scores[4] = 100;
``` ```
to change a score. Here scores[4] is an “l-value”, providing the means of storing 100 at location 4 of the vector. to change a score. Here scores[4] is an “l-value”, providing the means of storing 100 at location 4 of the vector.
– It is the job of the programmer to ensure that any subscript value i that is used is legal —- at least 0 and strictly less than scores.size(). - It is the job of the programmer to ensure that any subscript value i that is used is legal —- at least 0 and strictly less than scores.size().
## 2.4 Initializing a Vector — The Use of Constructors ## 2.4 Initializing a Vector — The Use of Constructors
Here are several different ways to initialize a vector: Here are several different ways to initialize a vector: