Concept explainers
Fill in the blanks in each of the following statements:
Typically, statements are used for counter-controlled
iteration and statements for sentinel-controlled iteration.
The “for loop” statements are used for counter-controlled iteration and “while loop” statements used for sentinel-controlled iteration.
Explanation of Solution
“for” loop:
- The for loop gets starts with the keyword “for”. It contains three control structures and these control structures are separated using (;) semicolon. They are:
- “Initial-action”, used to initialize the control variable.
- “Loop-continuation-condition”, it determines whether the loop gets repeated.
- “Action-after-each-iteration”, used to update the control variable for next iteration.
- So, the “for” loop always used for counter-controlled iteration.
A for loop is used to execute a block of statements repeatedly until the condition is true. The syntax of for loop:
for(i=initial_value;i<end_value;i++)
{
Loop statements;
}
- Here, the variable “i” is referred as control variable, it controls how many times that the loop gets executed.
“while” loop:
The “while” loop first checks its expression and then the statements inside the loop are executed. It is also called as pretest loops.
- These loops do not have to be terminated with a semicolon.
- With the false expressions, the loops can be terminated.
- So, the “while” loop always used for sentinel-controlled iteration.
Syntax:
The syntax for the while loop is as follows:
//while loop statement
while (condition)
{
//statement
}
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