我正在编写一个程序来合并一个我拥有的结构数组。
我正在尝试传递L和R的整数值，当我在mergesort函数中printf值时，值变为0。
这完全是我的代码。在mergesort的Sorter.c调用上发生此问题。
SORTER.C
#include "mergesort.h"
#include "Sorter.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char * argv[]){
/*
// checks if num of arguments is correct
if (argc != 2){
printf("Sorry, the input isn't in a correct format 1");
return 1;
}
// checks if second argument is -c
if (strcmp(argv[1],"-c") != 0){
printf("Sorry, the input isn't in a correct format 2");
return 1;
}*/
// stores third argument as the selected column to sort
char selectedColumn[strlen(argv[2])];
strcpy(selectedColumn,argv[2]);
int numOfLines = 5043;
//Generate this dynamically
FILE *fp;
fp = fopen("movie_metadata.csv","r");
char buffer[1000];
fgets(buffer, 1000, fp);
//printf("The first character is: %s", line);
Row *allRows = (Row*) malloc(sizeof(Row) * numOfLines);
char * splitLine;
char* lineCopy;
int i;
for (i = 0; i < numOfLines; i++){
fgets(buffer, numOfLines, fp);
lineCopy = buffer;
splitLine = strtok (lineCopy,",");
color = splitLine;
splitLine = strtok (NULL, ",");
director_name = splitLine;
splitLine = strtok (NULL, ",");
num_critic_for_reviews = splitLine;
splitLine = strtok (NULL, ",");
duration = splitLine;
splitLine = strtok (NULL, ",");
director_facebook_likes = splitLine;
splitLine = strtok (NULL, ",");
actor_3_facebook_likes = splitLine;
splitLine = strtok (NULL, ",");
actor_2_name = splitLine;
splitLine = strtok (NULL, ",");
actor_1_facebook_likes = splitLine;
splitLine = strtok (NULL, ",");
gross = splitLine;
splitLine = strtok (NULL, ",");
genres = splitLine;
splitLine = strtok (NULL, ",");
actor_1_name = splitLine;
splitLine = strtok (NULL, ",");
movie_title = splitLine;
splitLine = strtok (NULL, ",");
num_voted_users = splitLine;
splitLine = strtok (NULL, ",");
cast_total_facebook_likes = splitLine;
splitLine = strtok (NULL, ",");
actor_3_name = splitLine;
splitLine = strtok (NULL, ",");
facenumber_in_poster = splitLine;
splitLine = strtok (NULL, ",");
plot_keywords = splitLine;
splitLine = strtok (NULL, ",");
movie_imdb_link = splitLine;
splitLine = strtok (NULL, ",");
num_user_for_reviews = splitLine;
splitLine = strtok (NULL, ",");
language = splitLine;
splitLine = strtok (NULL, ",");
country = splitLine;
splitLine = strtok (NULL, ",");
content_rating = splitLine;
splitLine = strtok (NULL, ",");
budget = splitLine;
splitLine = strtok (NULL, ",");
title_year = splitLine;
splitLine = strtok (NULL, ",");
actor_2_facebook_likes = splitLine;
splitLine = strtok (NULL, ",");
imdb_score = splitLine;
splitLine = strtok (NULL, ",");
aspect_ratio = splitLine;
splitLine = strtok (NULL, ",");
movie_facebook_likes = splitLine;
splitLine = strtok (NULL, ",");
Row row = { .color = color, .director_name = director_name, .num_critic_for_reviews = num_critic_for_reviews, .duration = duration, .director_facebook_likes = director_facebook_likes, .actor_3_facebook_likes = actor_3_facebook_likes,
.actor_2_name = actor_2_name, .actor_1_facebook_likes = actor_1_facebook_likes, .gross = gross, .genres = genres, .actor_1_name = actor_1_name, .movie_title = movie_title, .num_voted_users = num_voted_users,
.cast_total_facebook_likes = cast_total_facebook_likes, .actor_3_name = actor_3_name, .facenumber_in_poster = facenumber_in_poster, .plot_keywords = plot_keywords, .movie_imdb_link = movie_imdb_link,
.num_user_for_reviews = num_user_for_reviews, .language = language, .country = country, .content_rating = content_rating, .budget = budget, .title_year = title_year, .actor_2_facebook_likes = actor_2_facebook_likes,
.imdb_score = imdb_score, .aspect_ratio = aspect_ratio, .movie_facebook_likes = movie_facebook_likes
};
allRows[i] = row;
//printf("%d - Director: %s and %d\n",i, *allRows[i].director_name, i);
}
printf("Director: %s\n", *allRows[0].director_name);
/*int test = 5042;
int* testptr = &test;
printf("%d", *testptr);
int test2 = 5042;
int* test2ptr = &test2;
printf("%d", *test2ptr);*/
int test = 0;
int test2 = 5042;
printf("this: %d", test2);
mergeSort(*allRows, test, test2, "director_name");
printf("Director: %s\n", *allRows[0].director_name);
return 0;
}
SORTER.H
/*
* Sorter.h
*
* Created on: Sep 27, 2017
* Author: Peter and Umar
*/
#ifndef SORTER_H_
#define SORTER_H_
typedef struct Row {
char* color[100];
char* director_name[100];
int* num_critic_for_reviews;
int* duration;
int* director_facebook_likes;
int* actor_3_facebook_likes;
char* actor_2_name[100];
int* actor_1_facebook_likes;
int* gross;
char* genres[500];
char* actor_1_name[100];
char* movie_title[100];
int* num_voted_users;
int* cast_total_facebook_likes;
char* actor_3_name[100];
int* facenumber_in_poster;
char* plot_keywords[1500];
char* movie_imdb_link[1000];
int* num_user_for_reviews;
char* language[40];
char* country[40];
char* content_rating[100];
int* budget;
int* title_year;
int* actor_2_facebook_likes;
int* imdb_score;
int* aspect_ratio;
int* movie_facebook_likes;
} Row;
char* color;
char* director_name;
char* actor_2_name;
char* genres;
char* actor_1_name;
char* movie_title;
char* actor_3_name;
char* plot_keywords;
char* movie_imdb_link;
char* language;
char* country;
char* content_rating;
int* num_critic_for_reviews;
int* duration;
int* director_facebook_likes;
int* actor_3_facebook_likes;
int* actor_1_facebook_likes;
int* gross;
int* num_voted_users;
int* cast_total_facebook_likes;
int* facenumber_in_poster;
int* num_user_for_reviews;
int* budget;
int* title_year;
int* actor_2_facebook_likes;
int* imdb_score;
int* aspect_ratio;
int* movie_facebook_likes;
#endif
MERGESORT.C
#include "mergesort.h"
#include "Sorter.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
// Merges two subarrays of arr[]
// First subarray is arr[l..m]
// Second subarray is arr[m+1..r]
void merge(Row* arr[], int l, int m, int r, char column[]){
int i, j, k;
int n1 = m - l + 1;
int n2 = r - m;
/* create temp arrays */
Row* L[n1];
Row* R[n2];
/* Copy data to temp arrays L[] and R[] */
for (i = 0; i < n1; i++)
*L[i] = *arr[l + i];
for (j = 0; j < n2; j++)
*R[j] = *arr[m + 1+ j];
/* Merge the temp arrays back into arr[l..r]*/
i = 0; // Initial index of first subarray
j = 0; // Initial index of second subarray
k = l; // Initial index of merged subarray
printf("right before 1\n");
while (i < n1 && j < n2)
{
//strcmp(column,"director_name") ==0
//strcmp(column,"actor_2_name") ==0
//strcmp(column,"genres") ==0
//strcmp(column,"actor_1_name") ==0
//strcmp(column,"movie_title") ==0
//strcmp(column,"actor_3_name") ==0
//strcmp(column,"plot_keywords") ==0
//strcmp(column,"movie_imdb_link") ==0
//strcmp(column,"language") ==0
//strcmp(column,"country") ==0
//strcmp(column,"content_rating") ==0
// do this for all the different column names ^^^
printf("right before\n");
if (strcmp(column,"director_name") ==0)
{
printf("equals director name\n");
if (strcmp(L[i]->director_name,R[j]->director_name) <= 0){
printf("next level\n");
*arr[k] = *L[i];
i++;
} else {
*arr[k] = *R[j];
j++;
}
k++;
}
// if (L[i] <= R[j])
// {
// arr[k] = L[i];
// i++;
// }
// else
// {
// arr[k] = R[j];
// j++;
// }
// k++;
}
/* Copy the remaining elements of L[], if there
are any */
while (i < n1)
{
*arr[k] = *L[i];
i++;
k++;
}
/* Copy the remaining elements of R[], if there
are any */
while (j < n2)
{
*arr[k] = *R[j];
j++;
k++;
}
}
/* l is for left index and r is right index of the
sub-array of arr to be sorted */
void mergeSort(Row* arr[], int l, int r, char column[]){
printf("%d\n", r);
printf("called\n");
printf("%d\n", l);
printf("%d\n", r);
//THIS IS PRINTING 0 FOR SOME REASON ^ need to debug
//printf("%s\n", *arr[0]->director_name);
//printf("%s\n", column);
if (l < r){
printf("l < r\n");
// Same as (l+r)/2, but avoids overflow for
// large l and h
int m = l+(r-l)/2;
// Sort first and second halves
mergeSort(arr, l, m, column);
mergeSort(arr, m+1, r, column);
merge(arr, l, m, r, column);
}
printf("Merged!\n");
}
我传入的值变为零。
我尝试过创建指针并传递它们，但值仍为零！我在这里吹脑筋......这是一项我正在努力的简单任务。我很感激任何帮助，我尝试了各种在线解决方案，但显然我在这里遗漏了一些东西..
谢谢