How to write to a file using open() and printf()?
There’s a trick to this. You need to duplicate the open file descriptor to file descriptor 1, i.e. stdout. Then you can use printf:
c
Pause screen at program completion in C
To do this quick hack, the most common two options are: and I suggest the latter method, though the first method really triggers on “any” key while the bottom one only triggers on enter.
How does one represent the empty char?
You can use c[i]= ‘\0’ or simply c[i] = (char) 0. The null/empty char is simply a value of zero, but can also be represented as a character with an escaped zero.
error C2371: ‘functionname’ redefinition: different basic types
You never declared getgrundflaeche before calling it. The compiler assumes undeclared functions return int. The later function definition is, of course, different. Solve this by adding a declaration before main():
X86 assembly – Handling the IDIV instruction
The first part of Mysticials answer is correct, idiv does a 128/64 bit division, so the value of rdx, which holds the upper 64 bit from the dividend must not contain a random value. But a zero extension is the wrong way to go. As you have signed variables, you need to sign extend rax to rdx:rax. There is a specific instruction for this, cqto (convert quad … Read more
Excess elements of scalar initializer for pointer to array of ints
The two are only partly equivalent. The difference being that: declares a two-dimensional array, which includes setting aside space for the array and ensuring that daytab references that memory. However: …only declares a pointer. So you’re trying to initialize a pointer with an array initializer, which doesn’t work as expected. There is no array; there’s no memory … Read more
How do you allow spaces to be entered using scanf?
People (and especially beginners) should never use scanf(“%s”) or gets() or any other functions that do not have buffer overflow protection, unless you know for certain that the input will always be of a specific format (and perhaps not even then). Remember than scanf stands for “scan formatted” and there’s precious little less formatted than user-entered data. It’s ideal if you have total control of … Read more
malloc(): memory corruption
What may cause this difference? Basically, the memory allocator allocates pages of memory at once for use by programs, and it gives you a pointer within them (making sure the following space is free for use). Since these pages are usually bigger than 8KiB, you have no issue in your mini-program. But if a larger program is … Read more
Convert Little Endian to Big Endian
OP’s sample code is incorrect. Endian conversion works at the bit and 8-bit byte level. Most endian issues deal with the byte level. OP code is doing a endian change at the 4-bit nibble level. Recommend instead: If performance is truly important, the particular processor would need to be known. Otherwise, leave it to the … Read more
Does stack grow upward or downward?
The behavior of stack (growing up or growing down) depends on the application binary interface (ABI) and how the call stack (aka activation record) is organized. Throughout its lifetime a program is bound to communicate with other programs like OS. ABI determines how a program can communicate with another program. The stack for different architectures … Read more