# Example : Simple Calculator
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## Description:
Develop a basic calculator that can add and subtract numbers.
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## Steps:
<div style="font-size: 25px;display: block; margin-bottom: 20px;">1. Write a failing test case to verify that the calculator can correctly add two numbers.</div>
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## Code
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## Steps:
<div style="font-size: 25px;display: block; margin-bottom: 20px;">1. Write a failing test case to verify that the calculator can correctly add two numbers.</div > <div style="font-size: 25px;display: block; margin-bottom: 20px; color: red;">2. Implement the minimal code required to make the test pass.</div >
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## Code
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## Code
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## Run test
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---
## Steps:
<div style="font-size: 25px;display: block; margin-bottom: 20px;">1. Write a failing test case to verify that the calculator can correctly add two numbers.</div > <div style="font-size: 25px;display: block; margin-bottom: 20px;">2. Implement the minimal code required to make the test pass.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;color: red;">3. Refactor the code if necessary.</div >
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---
## Steps:
<div style="font-size: 25px;display: block; margin-bottom: 20px;">1. Write a failing test case to verify that the calculator can correctly add two numbers.</div > <div style="font-size: 25px;display: block; margin-bottom: 20px;">2. Implement the minimal code required to make the test pass.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;">3. Refactor the code if necessary.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;color: red;">4. Write a failing test case to verify that the calculator can correctly subtract two numbers.</div >
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## Code
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## Steps:
<div style="font-size: 25px;display: block; margin-bottom: 20px;">1. Write a failing test case to verify that the calculator can correctly add two numbers.</div > <div style="font-size: 25px;display: block; margin-bottom: 20px;">2. Implement the minimal code required to make the test pass.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;">3. Refactor the code if necessary.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;">4. Write a failing test case to verify that the calculator can correctly subtract two numbers.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;color: red;">5. Implement the code to make the test pass.</div >
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## Code
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## Result
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---
## Steps:
<div style="font-size: 25px;display: block; margin-bottom: 20px;">1. Write a failing test case to verify that the calculator can correctly add two numbers.</div > <div style="font-size: 25px;display: block; margin-bottom: 20px;">2. Implement the minimal code required to make the test pass.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;">3. Refactor the code if necessary.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;">4. Write a failing test case to verify that the calculator can correctly subtract two numbers.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;">5. Implement the code to make the test pass.</div >
<div style="font-size: 25px;display: block; margin-bottom: 20px;color: red;">6. Refactor the code if necessary.</div >
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