1: An Introduction to the While Loop

The while loop in C is used to execute a block of code repeatedly as long as a specified condition is true.

• Syntax:

  while (condition) {
// Statements to be executed
// Loop continues until condition becomes false
}


• Example:

  int count = 1;

  while (count <= 5) {
printf("Count: %dn", count);
count++;
}


2: Introduction to Do-While Loop

The do-while loop is similar to the while loop, but it guarantees that the block of code is executed at least once before checking the condition.

• Syntax:

  do {
// Statements to be executed
// Loop continues until condition becomes false
} while (condition);


• Example:

  int num;

  do {
  printf("Enter a positive number: ");
  scanf("%d", &num);
  } while (num <= 0);

  printf("You entered: %dn", num);


3: Introduction to For Loop

The for loop is used when the number of iterations is known or fixed.

• Syntax:

  for (initialization; condition; increment/decrement) {
// Statements to be executed
}


• Example:

  int i;

  for (i = 1; i <= 5; i++) {
printf("Iteration: %dn", i);
}


4: Nested Loops

You can use loops inside other loops, known as nested loops, to perform more complex repetitive tasks.

• Example:
  int rows = 3;
  int cols = 4;
  int i, j;

  for (i = 1; i <= rows; i++) {
for (j = 1; j <= cols; j++) {
printf("(%d, %d) ", i, j);
}
printf("n");
}


5: Loop Control Statements (break, continue)

Loop control statements allow you to control the flow of loops.

• break Statement:

  • Terminates the loop immediately when encountered.
   

  int i;
for (i = 1; i <= 10; i++) {
if (i == 5) {
break;
}
printf("%d ", i);
}


• continue Statement:

  • Skips the current iteration of the loop and proceeds to the next iteration.
  int i;
for (i = 1; i <= 5; i++) {
if (i % 2 == 0) {
continue;
}
printf("%d ", i);
}


 6: Practice and Examples

• Practice Exercise:
  • Write a program to print the multiplication table of a given number using a for loop.
  • Use a while loop to prompt the user to enter positive numbers until they enter a negative number.
  • Implement a do-while loop to simulate a simple guessing game where the user has to guess a number between 1 and 10.

Practice implementing different types of loops and loop control statements to strengthen your understanding of repetitive programming tasks in C. Loops are essential for executing tasks efficiently and handling repetitive operations in real-world applications.