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Questions and Answers
What is the purpose of loops in C programming?
What is the purpose of loops in C programming?
Which loop type in C executes its body as long as the controlling expression is true?
Which loop type in C executes its body as long as the controlling expression is true?
How does the for loop differ from the while loop in C?
How does the for loop differ from the while loop in C?
In a do while loop, when is the condition checked?
In a do while loop, when is the condition checked?
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Why is the for loop commonly used in C programming?
Why is the for loop commonly used in C programming?
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What is a variable in C programming?
What is a variable in C programming?
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Which data type is used to store integer numbers in C?
Which data type is used to store integer numbers in C?
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How do you declare a variable in C to store floating-point numbers?
How do you declare a variable in C to store floating-point numbers?
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What is the purpose of control structures in programming?
What is the purpose of control structures in programming?
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Which symbol is commonly used as a mathematical operator in C programming?
Which symbol is commonly used as a mathematical operator in C programming?
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What is the purpose of control structures in programming?
What is the purpose of control structures in programming?
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Which of the following is an example of a data type in C?
Which of the following is an example of a data type in C?
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What do operators in programming languages do?
What do operators in programming languages do?
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What can loops in programming achieve?
What can loops in programming achieve?
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In the C programming language, what is the purpose of a pointer?
In the C programming language, what is the purpose of a pointer?
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Study Notes
Loops in C Programming
Loops are fundamental control structures used in C programming to execute statements repeatedly until a specified condition is met. They allow you to perform certain actions multiple times without having to repeat the code manually each time. There are three basic types of loops in C: while, for and do while. Here's how they work:
While Loop
The while loop executes its body as long as its controlling expression remains true. It can be written like this:
int main() {
int x = 5;
while(x > 0) {
printf("Value of X is %d\n", x);
x--;
}
}
In this example, the loop will print out the value of 'X', which is initially set to 5, decrementing it by one every iteration until it reaches zero.
For Loop
A more common type of loop is the for loop. This is used when we know beforehand the number of iterations needed. Its syntax looks like this:
for(int i=5;i>0;i--)
{
// Code
}
Here, the for statement declares a counter variable called 'i', initializes it with a starting value of 5, tests if the current value of 'i' is less than 0 (which will be false after five passes), and increments 'i' at the end of each pass through the loop.
Do While Loop
Finally, there is also the do while loop, where the checking of the condition comes after the execution of the loop body:
do
{
// Code here
}
while (condition);
This means that the loop always runs once before the test is made, regardless of what the initial state was.
All these loops give us flexibility over repetition without making our program unnecessarily complex.
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Description
Learn about the fundamental control structures in C programming - while, for, and do while loops. Understand how these loops work with examples of their syntax and usage. Enhance your understanding of repetition in programming with these loop types.
