Statement is a command to computer to do an action.
// this is a statement (value evaluation statement 'call')
// (calling function printf with an argument "Hello World!\n")
printf("Hello World!\n")
A few statement can be combined into one block statement with {} brackets
// this four statements are combined into one logical statement by braces
{
printf("Hello World!\n")
printf("I'm feeling good!\n")
// you can separate statements by newline
// (most preferable way, as shown above)
// or use semicolon for one-line recording
printf("How are you?\n"); printf("I hope everything in its right place\n")
}
After execution this example you’re see on the screen:
Hello World!
I'm feeling good!
How are you?
I hope everything in its right place
Statements inside block statement are executed in our usual reading order from left to right, top to bottom. This abstract example shows order of execution:
{
<statement1>; <statement2>
<statement3>; <statement4>
<statement5>
<statement6>
...
}
A Simple example that asks the user to enter a number from 0 to 9, and if it is within the specified limits, compares it with a constant n and prints result of this comparison. This simple example shows all kinds of statement
import "libc/stdio"
public func main () -> Int32 {
// variable definition statement
var number: Int32
// assignation statement
number = 0
// while statement
while true {
// value evaluation statement
printf("enter a number (from 0 to 9): ")
// value evaluation statement
scanf("%d", &number)
// if-else statement
if number < 0 {
// value evaluation statement
printf("number must be greater than zero, try again\n")
// again statement ('continue' in C)
again
} else if number > 9 {
// value evaluation statement
printf("number must be less than nine, try again\n")
// again statement ('continue' in C)
again
} else {
// break statement
break
}
}
// let statement
let n = 5
// if-else statement
if number < n {
// value evaluation statement
printf("entered number (%i) is less than %i\n", number, n)
} else if number > n {
// value evaluation statement
printf("entered number (%i) is greater than %i\n", number, n)
} else {
// value evaluation statement
printf("entered number (%i) is equal with %i\n", number, n)
}
// return statement
return 0
}