What do you mean by odd loops in C language?

In C programming language, control statements are used to repeat a set of statements, while conditional statements are used for decision-making. These decision-making statements are also used to determine one or more conditions that decides whether a set of statements should be executed. They are as follows ?

• for loop
• while loop
• do-while loop

For loop and while loop, the condition specifies the number of times the loop can be executed.

The "for loop"

The for loop is an entry-controlled loop that executes statements until the specified condition is met. Each element of the for loop is placed inside the parenthesis along with the specified keyword.

for (k = 1; k<=5; k++)

Here, the loop will execute until k<=5, whenever k>5, the control will exit the loop.

So, in this case, the for-loop condition specifies that the loop will execute 5 times.

Example

This C code determines the integer k and uses a for loop to print the values from 1 to 5. This loop runs while k<=5, incrementing k each time.

main() {
   int k;
   for (k = 1; k <= 5; k++) {
      printf("%d", k);
   }
}

When the above program is executed, it produces the following output ?

1 2 3 4 5

The "while loop"

The while loop in C is used to evaluate a test condition and iterates over the loop until the specified condition returns true. It is also called a pre-tested loop because it is commonly used for a specified number of iterations.

while (k< = 5)

Here, the loop will execute until k<=5, whenever k>5 the control will exit the loop. So, in this case, the while-loop condition specifies that the loop will execute 5 times.

Example

Following is the C program for the while loop ?

main() {
   int k;
   k = 1;
   while (k <= 5) {
      printf("%d", k);
      k++;
   }
}

The result is generated as follows ?

1 2 3 4 5

What are the Odd Loops in C?

Sometimes a user may not know how many times a loop needs to be executed. If we want to execute a loop for an unknown number of times, the concept of indefinite loops should be implemented. This can be done using for-loops, while-loops, or do-while-loops.

Example: C program for the odd loop

Following is the C program that prompts the user to enter a number, checks if it's even or odd, and asks if we want to test another number. This loop continues until the user specifies '0'.

#include <stdio.h>
int main() {
   int number;
   number = 1;
   while (number == 1)  // odd loop don?t know how many times loop executes{
      printf("enter a number:");
      scanf("%d",&number);
      if((number%2)==0)
         printf("number is even");
      else
         printf("number is odd");
         printf("do you want to test any number");
         printf("if yes then press '1'");// if press 1 loop executes again
         printf("else press '0'");//if press 0 exist from loop
         scanf("%d",&number);
}
return 0;
}

The result is generated as follows ?

enter a number:
3
number is odd
do you want to test any number
if yes then press '1'
else press '0'
1
enter a number:
4
number is even
do you want to test any number
if yes then press '1'
else press '0'
1
enter a number:
9
number is odd
do you want to test any number
if yes then press '1'
else press '0'
0