Gotchas: Difference between revisions
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As using <code>sizeof</code> on a memory address returns the number of bytes that the CPU's instruction pointer register can hold, you'll get the same return value from <code>gotcha</code> regardless of how many elements the array has. When C programmers talk about "arrays decaying into pointers" this is what they're referring to. |
As using <code>sizeof</code> on a memory address returns the number of bytes that the CPU's instruction pointer register can hold, you'll get the same return value from <code>gotcha</code> regardless of how many elements the array has. When C programmers talk about "arrays decaying into pointers" this is what they're referring to. |
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In order for a function to use an array's intended size, it must be passed in as a separate argument. |
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<syntaxhighlight lang="C">int foo(char buf[],int length){} |
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int main() |
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{ |
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char myArray[30]; |
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int j = foo(myArray,sizeof(myArray)); //passes 30 as the length parameter. |
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} |
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}</syntaxhighlight> |
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===gets()=== |
===gets()=== |
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