- This repo is for me to practice the c++ programming.
- I write notes on what I learned for future reference.
- http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-096-introduction-to-c-january-iap-2011/lecture-notes/MIT6_096IAP11_lec01.pdf
==
| Definition | Size | Supported number range | Standard-defined minimum size |
|---|---|---|---|
| char myVar; | 8 bits | -128 to 127 | 8 bits |
| short myVar; | 16 bits | -32,768 to 32,767 | 16 bits |
| long myVar; | 32 bits | -2,147,483,648 to 2,147,483,647 | 32 bits |
| long long myVar; | 64 bits | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | 64 bits |
| int myVar; | 32 bits | -2,147,483,648 to 2,147,483,647 | 16 bits |
| Definition | Size | Supported number range |
|---|---|---|
| float x; | 32 bits | -3.4x1038 to 3.4*1038 |
| double x; | 64 bits | -1.7x10308 to 1.7*10308 |
- Sometimes a programmer knows that a variable's numbers will always be positive (0 or greater), such as when the variable stores a person's age or weight.
- The programmer can prepend the word "unsigned" to inform the compiler that the integers will always be positive.
- Because the integer's sign needs not be stored, the integer range reaches slightly higher numbers.
unsigned vs signed int
1 byte: 0..255
|--> unsigned 0..255
|--> signed -128..127
==
if (amount1 > amount2) {
cout << amount1 << endl;
} else {
cout << amount2 << endl;
}
cout << (amount1 > amount2 ? amount1 : amount2);==
- array, vector, list, stack, queue, map, etc
- A container is a holder object that stores a collection of other objects (its elements). They are implemented as class templates, which allows a great flexibility in the types supported as elements.
==
- We can define functions with the same identifier if they have different signatures (e.g., different return type, different arguments)
==
cout << 10 / 4 << endl; //=> 2
cout << 10.0 / 4 << endl; //=> 2.5
cout << 10.0 / 4.0 << endl; //=> 2.5cout << static_cast<double>(10) / 4 << endl; //=> 2.5
cout << double(10) / 4 << endl; //=> 2.5
cout << (double)10 / 4 << endl; //=> 2.5==