How to Write a C Program to Display Numbers Divisible by 5 but Not 3 from 1 to 100

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Introduction

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This article provides a step-by-step guide on how to write a C program to display numbers from 1 to 100 that are divisible by 5 but not by 3. This is a fundamental exercise in programming, often used as a test of basic programming skills and understanding. It serves as a good example to apply control structures, arithmetic operations, and conditional logic in C programming.

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Understanding the Problem

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The task at hand is to create a C program that iterates through the numbers 1 to 100, checking each number to see if it is divisible by 5 but not by 3. Divisibility checks are typically performed using the modulo operator (%). If a number is divisible by 5, the result of the modulo operation will be 0; similarly, if a number is divisible by 3, the result will also be 0.

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Step-by-Step Guide

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The following steps outline the process of writing the program:

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Step 1: Set Up the Environment

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Ensure you have a C compiler and an Integrated Development Environment (IDE) or a text editor set up. Common choices include Visual Studio Code, CLion, or a simple text editor like Notepad with a C compiler installed (like gcc or clang).

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Step 2: Include Necessary Libraries

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To perform I/O operations, include the stdio.h header file. This library is essential for input and output operations in C.

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include stdio.h

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Step 3: Define the Main Function

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All standalone C programs are executed by the int main() function. Inside this function, the primary logic of the program is written.

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int main {    // Program logic goes here    return 0;}

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Step 4: Declaring and Initializing Variables

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Create an integer variable i to hold each number from 1 to 100 within the loop.

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int i

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Step 5: Writing the For Loop

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The for loop will iterate from 1 to 100. Use the for statement with three parts: initialization, condition, and increment.

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for i  1 i  100 i {    // Loop body}

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Step 6: Implementing the Divisibility Check

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Within the loop, check if the current number is divisible by 5 but not by 3 using the modulo operator.

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if i  5  0  i  3 ! 0 {    // It is divisible by 5 and not 3    printf}

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Step 7: View the Output

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The printf statement will output the numbers that meet the criteria.

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printf

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Complete Example Code

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Here is the complete C program that implements the logic described:

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include stdio.hint main {    int i    for i  1 i  100 i {        if i  5  0  i  3 ! 0 {            printf        }    }    return 0}

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Conclusion

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Understanding and mastering simple programming exercises like these is crucial for any aspiring programmer. It not only tests your ability to apply basic programming constructs but also helps in debugging and troubleshooting skills. This exercise is a slight variation of the classic 'Fizz Buzz' problem, adding an extra layer of complexity by combining multiple conditions.

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If you're facing challenges with this or other basic programming tasks, consider revisiting your study materials or seeking help from online communities, forums, or instructors. There are many resources available to help you enhance your programming skills.

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Remember, programming is a skill that improves with practice. Keep coding!