# How to find the capacity of Channel, Pointer and Slice in Golang?

Go language, capacity defines the maximum number of elements that a particular can hold. Here the task is to find the capacity of Channel, Pointer, and Slice in Golang, we can use the cap() function.

Syntax:

```func cap(l Type) int
```

Here, the type of l is a pointer.

Let us discuss this concept with the help of the examples:

Example 1: In this example, cap() function is used to find the capacity of Pointer in Golang.

 `// Go program to illustrate how to find the  ` `// capacity of the pointer  ` `package main  ` `   `  `import (  ` `    ``"fmt"` `)  ` `   `  `// Main function  ` `func main() {  ` `   `  `    ``// Creating and initializing  ` `    ``// pointer ` `    ``// Using var keyword  ` `    ``var ptr1 *``int` `    ``var ptr2 *string  ` `    ``var ptr3 *float64  ` `   `  `    ``// Finding the capacity of  ` `    ``// the pointer ` `    ``// Using cap function  ` `    ``fmt.Println(``"Capacity of ptr1: "``, cap(ptr1))  ` `    ``fmt.Println(``"Capacity of ptr2: "``, cap(ptr2))  ` `    ``fmt.Println(``"Capacity of ptr3: "``, cap(ptr3))  ` `   `  `}  `

Output:

```Capacity of ptr1:  7
Capacity of ptr2:  5
Capacity of ptr3:  8
```

Example 2: In this example, cap() function is used to find the capacity of Channel in Golang.

 `// Go program to illustrate how to find the  ` `// capacity of the Channel ` `package main  ` `   `  `import (  ` `    ``"fmt"` `)  ` `   `  `// Main function  ` `func main() {  ` `   `  `    ``// Creating and initializing  ` `    ``// Channel ` `    ``// Using var keyword  ` `    ``ch1 := make(chan ``int``, 7)  ` `    ``ch2 := make(chan string, 5) ` `    ``ch3 := make(chan float64, 8) ` `   `  `    ``// Finding the capacity of  ` `    ``// the Channel ` `    ``// Using cap function  ` `    ``fmt.Println(``"Capacity of Channel1: "``, cap(ch1))  ` `    ``fmt.Println(``"Capacity of Channel2: "``, cap(ch2))  ` `    ``fmt.Println(``"Capacity of Channel3: "``, cap(ch3))  ` `   `  `}  `

Output:

```Capacity of Channel1:  7
Capacity of Channel2:  5
Capacity of Channel3:  8
```

Example 3: In this example, cap() function is used to find the capacity of Slice in Golang.

 `// Go program to illustrate how to find the  ` `// capacity of the Slice  ` `package main  ` `   `  `import (  ` `    ``"fmt"` `)  ` `   `  `// Main function  ` `func main() {  ` `   `  `    ``// Creating and initializing  ` `    ``// Slice  ` `    ``// Using var keyword  ` `    ``sl1 := make([]``int``, 0, 7)  ` `    ``sl2 := make([]string, 0, 5) ` `    ``sl3 := make([]float64, 0, 8) ` `   `  `    ``// Finding the capacity of  ` `    ``// the Slice  ` `    ``// Using cap function  ` `    ``fmt.Println(``"Capacity of Slice1: "``, cap(sl1))  ` `    ``fmt.Println(``"Capacity of Slice2: "``, cap(sl2))  ` `    ``fmt.Println(``"Capacity of Slice3: "``, cap(sl3))  ` `   `  `} `

Output:

```Capacity of Slice1:  7
Capacity of Slice2:  5
Capacity of Slice3:  8
```

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