[Solved] Limit output to 5 items [duplicate]

you can use the head command to limit the output of grep to the first 5 results before passing it to xargs. Here’s the modified command: grep -r -l ‘foo’ | head -n 5 | xargs sed -i ‘s/foo/bar/g’ For items 5 to 10, you can use a combination of head and tail commands to … Read more

[Solved] How do I read a large file of numbers and store its content in an array?

fopen, calloc, and realloc can all fail, returning NULL. In the case of realloc, the original allocation will remain untouched, so immediately overwriting the original pointer with the newly returned value will leak memory and throw away potentially useful data. Reallocating every iteration is rather costly. A better strategy is to reallocate when the buffer … Read more

[Solved] realloc fails when printf is in code / weird chars

Your code exhibits undefined behaviour because you passed a non-static, uninitialised pointer to realloc whose contents were indeterminate. From C11, Memory Management Functions: The realloc function deallocates the old object pointed to by ptr and returns a pointer to a new object that has the size specified by size. ….if ptr does not match a … Read more

[Solved] i have been on this question for quaring the document for two days straight, and it is not working. don’t want to cheat, can you point the problem

When processing regular characters (final else clause) you read additional input instead of operating over text, i.e. instead of: scanf(“%c”, &document[parano][sentno][wordno][charno]); printf(“%c\n”, document[parano][sentno][wordno][charno]); charno++; you want to do: document[parano][sentno][wordno][charno++] = text[i]; By the time we hit text[i] == ‘ ‘ for the first time the value of ***document is “3\n1 2\n2\n” but you wanted it … Read more

[Solved] i have been on this question for quaring the document for two days straight, and it is not working. don’t want to cheat, can you point the problem

Introduction If you’ve been struggling with a document for two days and can’t seem to get it to work, you’re not alone. Many people have difficulty understanding the complexities of document formatting and troubleshooting. Fortunately, there are many resources available to help you solve your problem. In this post, we’ll discuss some tips and tricks … Read more

[Solved] How to use realloc in a function in C

You want to modify the value of an int* (your array) so need to pass a pointer to it into your increase function: void increase(int** data) { *data = realloc(*data, 5 * sizeof int); } Calling code would then look like: int *data = malloc(4 * sizeof *data); /* do stuff with data */ increase(&data); … Read more

[Solved] Error when coding my own implementation of realloc()

Invalid assumption: void *my_realloc(void *ptr, size_t size) { unsigned char *old_ptr = (unsigned char *)ptr; You’re breaking the realloc() specification here. realloc() doesn’t assume that the ptr would always be pointing to a string. It is type-agnostic. And the cast is redundant. There’s an implicit conversion from void * to any other pointer type. Undefined … Read more

[Solved] How to grow a pointer or an array in C at runtime (without knowing the end length at compile time)

OP’s mostly has it. It is just printing the first element each time. // printf(“%d”, *arr); printf(“%d”, arr[n-1]); is it possible to do it with an array? No. In C an array cannot change size once it is defined. The memory size allocated and referenced by a pointer can change though. solved How to grow … Read more