C Archives - Page 22 of 22

Do I cast the result of malloc?

In this question, someone suggested in a comment that I should not cast the result of malloc. i.e., I should do this: int ...

April 10, 2022
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Improve INSERT-per-second performance of SQLite

Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts per second to over 96,000 inserts per second! ...

April 10, 2022
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What is the “–>” operator in C/C++?

After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated, I was completely surprised that the following snippet compiled and worked in ...

April 9, 2022
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scanf() Leaves the Newline Character in the Buffer

I have the following program: As I read in the C book, the author says that scanf() left a newline character in the buffer, therefore, ...

March 4, 2022
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Why Gets Function So Dangerous That It Should Not Be Used

When I try to compile C code that uses the gets() function with GCC, I get this warning: (.text+0x34): warning: the `gets’ function is dangerous ...

March 4, 2022
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Why in C Constructs Using Pre and Post-Increment Undefined Behavior?

Best Answer C has the concept of undefined behavior, i.e. some language constructs are syntactically valid but you can’t predict the behavior when ...

March 4, 2022
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Why is “while ( !feof (file) )” always wrong

What is wrong with using feof() to control a read loop? For example: Best Answer while(!feof) is wrong because it tests for something that is irrelevant ...

March 4, 2022
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Undefined, unspecified and implementation-defined behavior

What is undefined behavior (UB) in C and C++? What about unspecified behavior and implementation-defined behavior? and What is the difference between them? Best Answer Undefined behavior is one ...

March 4, 2022
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Do I cast the result of malloc?

TL;DR int *sieve = (int *) malloc(sizeof(int) * length); Has two problems in result of malloc. The cast and that you’re using the ...

March 3, 2022
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