I’m attempting to use a C library for an opencourseware course from Harvard. The instructor’s instructions for setting up the external lib can be found here. I am following the instructions specific to ubuntu as I am trying to use this lib on my ubuntu box. I followed the instructions on the page to set

struct.h #ifndef STRUCT_H #define STRUCT_H struct linkedlist { int data; }; static struct linkedlist *head = NULL; void build_linkedlist(); #endif struct.c #include <stdio.h> #include <stdlib.h> #include "struct.h" void build_linkedlist() { head = malloc(sizeof(struct linkedlist)); head->data = 5; printf("inside build_linkedlist(): head = %p\n\n", head); } main.c #include <stdio.h> #include "struct.h" int main() { build_linkedlist(); printf("inside main():

Here is the context of my question. I have this code : typedef enum DType { float32 } DType; typedef struct Array { void *data; DType dtype; ... } Array; The whole idea is to cast the pointer data to the adequate type depending on the value of the field dtype. Although it is possible

Code char a; a = 0xf1; printf("%x\n", a); Output fffffff1 printf() show 4 bytes, that exactly we have one byte in a. What is the reason of this misbehavior? How can I correct it? You need to sign in to view this answers

If I have two GPS locations, say 51.507222, -0.1275 and 48.856667, 2.350833, what formula could I use to calculate the distance between the two? I’ve heard a lot about a haversine formula, but can’t find any information about it, or how to apply it to C. I’ve written the following code, however, it’s very innacurate.

here is very simplified code of problem I have: enum node_type { t_int, t_double }; struct int_node { int value; }; struct double_node { double value; }; struct node { enum node_type type; union { struct int_node int_n; struct double_node double_n; }; }; int main(void) { struct int_node i; i.value = 10; struct node n;

I made a small C calculator earlier today, and I noticed it worked fine when the only operation it was able to do was addition, however when I tried to add subtraction, multiplication or division, it would simply not give an output, and I don’t know the reason for it as another calculator I had

I have two structs struct A and struct B with the same memory layout, and I want to cast a return value of type struct A to type struct B, for example, in C++, I can achieve this goal in single line (without any temporary variable) like this: #include <utility> struct Temp { int a;

#include <stdio.h> #include <stdlib.h> #include <math.h> void pivot(double **matrix, int n, int row) { double maxElement = fabs(matrix[row][row]); int maxRow = row; for (int i = row + 1; i < n; i++) { if (fabs(matrix[i][row]) > maxElement) { maxElement = fabs(matrix[i][row]); maxRow = i; } } if (maxRow != row) { double *temp =

I am writing a program to solve Sokoban levels – because why not. The initial trigger for writing the program was to show a colleague how a program can be written using the MVC pattern. From there, it evolved. The good: for some warehouses, the solver finds the proper solutions. I know because I created