Fixing Variable Shadowing in Solidity: uint256 Redeclaration Error

[rnkrtt]

The issue arises because the variable a is already declared as a parameter of the arithmeticError function:

function arithmeticError(uint256 a) public {
    uint256 a = a - 100; // Error: `a` is already declared as a parameter
}

When you redeclare a with uint256 a = a - 100;, the compiler throws an error because you're trying to shadow the parameter a by declaring a new variable with the same name. This is not allowed in Solidity.

To fix this, simply remove the type declaration (uint256) and use the parameter a directly:

solidity
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function arithmeticError(uint256 a) public {
    a = a - 100; // Correct: modifies the existing parameter `a`
}

[DaniPopes]

Thanks!

[rnkrtt]

@DaniPopes Hello! Can someone take a look at this pull request and merge it if everything looks good? Let me know if any adjustments are needed. Appreciate it!

[rnkrtt]

@DaniPopes