Solidity provides conditional code execution with the help of the if...else instructions. The general structure of if...else is as follows:
if (this condition/expression is true) {
Execute the instructions here
}
else if (this condition/expression is true) {
Execute the instructions here
}
else {
Execute the instructions here
}if and if-else are keywords in Solidity and they inform the compiler that they contain a decision control condition, for example, if (a > 10). Here, if contains a condition that can evaluate to either true or false. If a > 10 evaluates to true then the code instructions that follow in the pair of double-brackets ({) and (}) should be executed.
else is also a keyword that provides an alternate path if none of the previous conditions are true. It also contains a decision control instruction and executes the code instructions if a > 10 tends to be true.
The following example shows the usage of 'IF'-'ELSE IF' - 'ELSE' conditions...