65 lines
1.5 KiB
Markdown
65 lines
1.5 KiB
Markdown
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# Arrays
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## Where is the 2nd variable below stored in memory?
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```go
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// Let's say that first variable below is stored in this memory location: 20th
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var (
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first int32 = 100
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second int32 = 150
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)
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```
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1. 21
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2. 22
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3. 24
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4. It can be stored anywhere *CORRECT*
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> **4:** That's right. It can be anywhere. Because, there's no guarantee that variables will be stored in contiguous memory locations.
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## Where is the 3rd element of the following array stored in memory?
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```go
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//
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// Let's say that:
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// nums array is stored in this memory location (cell): 500th
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//
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// So, this means: nums[0] is stored at 500th location as well.
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//
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var nums [5]int64
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```
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1. 3
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2. 2
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3. 502
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4. 503
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5. 516 *CORRECT*
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> **2:** Nope, that's the index of an element.
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>
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> **3, 4:** 500+index? You're getting closer.
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>
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> **5:** Perfect. Array elements are stored in contiguous memory locations (cells). Here, the array's location is 500, and each element is 8 bytes (int64). So, 1st element: 500th, 2nd element: 508th, 3rd element: 516th, and so on. Formula: 516 = 500 + (8 * (3 - 1)).
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## How many values the following variable represents?
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```go
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var gophers [10]string
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```
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1. 0
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2. 1 *CORRECT*
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3. 2
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4. 10
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> **2:** That's right! A variable can only store one value. Here, it stores a single array value with all its elements. However, through the gophers variable, you can access to 10 string values individually of that array.
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>
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> **4:** That's the length of the array. It's not the number of values that the gophers variable represents.
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## ?
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1. text *CORRECT*
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2. text
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> **1:**
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>
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