In Go, panic is like an exception arising at runtime. Due to this execution of program is terminated. We can use panic to signal abnormal behavior in the program.
While working with channels, we may notice panic, for example, when sending to a channel once it has been closed or closing an already closed channel. Panic is used to signal the program to fail when there are errors that we cannot handle.
1package main
2
3import "fmt"
4
5func main() {
6 var a, b int
7 fmt.Println("Enter two numbers to divide: ")
8 fmt.Scanf("%d %d", &a, &b)
9 if (b == 0) {
10 panic("Cannot divide by zero")
11 } else {
12 fmt.Println(a / b)
13 }
14}
In above code, we are taking two integer values from the user using Scanf function and assigned them to a and b variables. Next, we want to divide a by b. Now, if the denominator is zero, we cannot divide a. In this situation, we have to exit the program, but we want to provide proper information. For this, we can use panic function to throw an error.
The program by default does not necessarily stop running when it encounters an error. We can use panic function to inform the program to stop allowing program to exit gracefully.
go run main.go
Enter two numbers to divide:
5 0
panic: Cannot divide by zero
Comments