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In this tutorial, you will learn how to print all odd numbers between 1 to 100 using a while loop conditional statement in C Programing Language. For a better understanding of this problem, we are using algorithms, examples, and Program explanations.

Required Knowledge

• C Programming Basics
• C Programming Operators
• C printf and Scanf
• While loop in C

Problem Statement

You have to write a C program that will print all the odd numbers between 1 and 100 using a while loop. This program will not take user input as our bound is already defined 1 to 100. So it should only print all the odd numbers as an output.

Example

Output:
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99

Algorithm to Print All Odd Numbers

1. Start the program.
2. Declare a variable num to represent the current number, initialized to 1.
3. Print the header message: “Odd numbers between 1 and 100:”
4. Enter the while loop with the condition num <= 100.
   • Check if the current number num is odd using the modulo operator (num % 2 != 0).
   • If it is odd, print the value of num.
   • Increment num by 1.
5. Exit the while loop.
6. Print a new line to separate the output.
7. End the program

Logic used to solve this problem

• Initialize a num variable to 1.
• Use a While loop that runs as long as the num is less than or equal to 100.
• Inside the loop, check if the num is an odd number using the modulo (%) operator.
• If the num is odd, print the number.
• Increment the num by 1 in each iteration.
• Continue the loop until the num reaches 100.
• Finish the program.

Program to print all odd number between 1 to 100

#include <stdio.h>
int main() {
    int num = 1;
    printf("Odd numbers between 1 and 100: ");
    while (num <= 100) {
        if (num % 2 != 0) {
            printf("%d ", num);
        }
        num++;
    }
    printf("\n");
    return 0;
}

Output

Odd numbers between 1 and 100: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99

Program Explanation

• The program initializes a variable num to 1, which represents the first odd number to be printed.
• The program enters a while loop with the condition num <= 100 to iterate through numbers from 1 to 100.
• Inside the while loop, it checks if num is an odd number.
• If num is odd, it prints the value of num on the screen.
• It then increments the value of num by 2 since the next odd number will be 2 greater than the current one.
• The loop continues until num exceeds the value of 100.
• Once the while loop is complete, the program ends.

Conclusion

The C program successfully prints all the odd numbers between 1 and 100 using a while loop. By checking the divisibility of each number by 2, it identifies the odd numbers and prints them on a single line. I hope you really enjoyed this tutorial. Do like, share and Subscribe