qsort Questions
1
Overview
There are a few questions similar to this one but they are all slightly different. To be clear, if values is an array of integers, I want to find perm such that sorted_values (values sort...
9
Solved
Suppose I have an array of pointers to char in C:
char *data[5] = { "boda", "cydo", "washington", "dc", "obama" };
And I wish to sort this array using qsort:
qsort(data, 5, sizeof(char *), comp...
Realize asked 15/8, 2010 at 20:39
4
Solved
I have a report, unconfirmed by me but from a reliable source, that the code
qsort(a, n, sizeof *a, cmpfunc);
is compiled by a modern version of gcc as if it had been written
if(n == 0)
__b...
Gandhi asked 26/10, 2022 at 12:29
2
Solved
I was just playing around with sorting in golang and I found a qsort function on stackoverflow. It seems to run about twice as fast as the native sort function in golang. I've tried it with differe...
2
I'm doing an analysis for the quicksort (qsort from c++ STL) algorithm, the code is:
#include <iostream>
#include <fstream>
#include <ctime>
#include <bits/stdc++.h>
#includ...
Sandrasandro asked 16/3, 2021 at 17:34
3
Solved
There are a couple of obvious ways to use qsort: cast in the comparator:
int cmp(const void *v1, const void *v2)
{
const double *d1 = v1, *d2 = v2;
⋮
}
qsort(p, n, sizeof(double), cmp);
or cas...
6
Solved
First, I defined a dynamic array with 2 columns and 10 row. The integer number is set to 10 here just for example.
int** array;
int number = 10;
array = malloc(number * sizeof(int*));
for (i = 0...
Spiegelman asked 19/6, 2013 at 22:4
5
Solved
According to this site, I have done the following program which sorts strings.
#include <cstdlib>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char list[5][4]=...
4
Solved
I don't know what I'm doing wrong but the following code does not sort the array properly.
#include <stdio.h>
#include <stdlib.h>
int compare(const void* a, const void* b)
{
return (...
3
#include <stdio.h>
#include <stdlib.h>
float values[] = { 4, 1, 10, 9, 2, 5, -1, -9, -2,10000,-0.05,-3,-1.1 };
int compare (const void * a, const void * b)
{
return ( (int) (*(float*...
5
Solved
I see lots of people use subtraction in a qsort comparator function. I think it is wrong because when dealing with these numbers: int nums[]={-2147483648,1,2,3}; INT_MIN = -2147483648;
int compare...
3
Solved
I'm not sure if this is possible to do with qsort because what I want to sort (array of pointers to struct) is not what I am comparing (strings).
Here is an abridged version of my program (assume ...
2
Solved
How to compare long doubles with qsort() and with regard to not-a-number?
When sorting an array that might contain not-a-numbers, I would like to put all the those NAN to one end of the sorted ...
3
Solved
I'm assuming that the good old qsort function in stdlib is not stable, because the man page doesn't say anything about it. This is the function I'm talking about:
#include <stdlib.h>
void ...
Rancorous asked 25/2, 2009 at 4:6
3
Solved
I am making C dynamic array library, kind of. Note that I'm doing it for fun in my free time, so please do not recommend million of existing libraries.
I started implementing sorting. The array is...
4
Now, I have seen various examples, but I don't get what they mean.
Here's my structure
typedef struct profile{
char gender[1];
double soc;
. . .
} PROFILE;
where soc is social security numbe...
3
Assume I have a square matrix A of size n, defined as a std::vector<double>.
std::vector<double> A(n*n);
The elements of the matrix are accessed the usual way:
double a_ij = A[i*n +...
4
Solved
I have an array which looks like this:
int array[] = {4.53, 3.65, 7.43, 9.54, 0.72, 0.0}
I am just wondering what method I can use to partially sort this array to bring the top three biggest dou...
2
Solved
When I use qsort() in the C on my Mac, these code works well, It can sort every lines in one file well.
int compare(const void *p, const void *q) {
return strcmp(p,q);
}
void function_name(){
c...
2
I am trying to sort my QList based on a QDateTime but I get the following error:
must use '.*' or '->*' to call pointer-to-member function in 'lessThan (...)', e.g. '(... ->* lessThan) (...)...
5
Solved
I am writing a function that receives a pointer to a comparison function and an array of MyStructs and is supposed to sort the array according to the comparison function:
void myStructSort(
stru...
Assignat asked 11/8, 2015 at 13:14
5
I wrote a (qsort-compatible) comparison function for a struct that has some unsigned fields in it:
typedef struct {
int a;
unsigned b;
} T;
int cmp(T t1, T t2)
{
// Decreasing order in "a"
if...
4
Solved
I am a beginner to C and I am trying to understand the comparison function needed for the qsort function.
Part One: Syntax
A simple suggested use is this (I have included some main() code to prin...
Donoghue asked 27/12, 2012 at 18:36
6
Solved
I found this sample code online, which explains how the qsort function works. I could not understand what the compare function returns.
#include "stdlib.h"
int values[] = { 88, 56, 100, 2, 25 };
...
3
Solved
I am using this compare function to sort an array consisting of long long int nos.
int compare(const void * p1,const void * p2)
{
return (* (long long int * )a-*(long long int * )b);
}
qsort(arra...
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