[英]Segmentation Fault when My Code Executes the printf() in c
下面我發布了我的代碼。 當我編譯時,我沒有收到任何錯誤,只有一個關於我尚未使用的變量的警告。 代碼一直工作到開始打印的代碼行。 我已經測試了所有部分,並且我認為其中一個有問題。 請讓我知道我做錯了什么,以便我修復它。
#include <stdio.h>
#include <string.h>
#define NUM_LINES 37
#define LINE_LENGTH 60
void select_sort_str(char list[NUM_LINES][LINE_LENGTH], int n);
int alpha_first(char list[NUM_LINES][LINE_LENGTH], int min_sub, int max_sub);
int main (void){
//store each line in an array of strings
FILE *inp;
FILE *outp;
char hurr[NUM_LINES][LINE_LENGTH];
;
inp = fopen("hurricanes.csv","r");
outp = fopen("out.txt","w");
//read in lines from file
for (int i = 0; i<NUM_LINES; i++){
fgets(hurr[i], LINE_LENGTH, inp);
}
inp = fopen("hurricanes.cvs","r");
//printf("%s", hurr[0]);
//define function
select_sort_str(hurr, NUM_LINES);
return(0);
}
int
alpha_first(char list[NUM_LINES][LINE_LENGTH], // input - array of pointers to strings
int min_sub, // input - min and max subscripts of
int max_sub) // portion of list to consider
{
int first, i;
first = min_sub;
for (i = min_sub + 1; i <= max_sub; ++i) {
if (strcmp(list[i], list[first]) < 0) {
first = i;
}
}
return (first);
}
/*
* Orders the pointers in an array list so they access strings in
* alphabetical order
* Pre: first n elements of list reference string of uniform case;
* n >= 0
*/
void
select_sort_str(char list[NUM_LINES][LINE_LENGTH], // input/output - array of pointers being
// ordered to acces strings alphabetically
int n) // input - number of elements to sort
{
int fill, // index of element to contain next string in order
index_of_min; // index of next string in order
char *temp;
char temp1[NUM_LINES][LINE_LENGTH];
for (fill = 0; fill < n - 1; ++fill) {
index_of_min = alpha_first(list, fill, n - 1);
if (index_of_min != fill) {
temp = list[index_of_min];
list[index_of_min][LINE_LENGTH] = list[fill][LINE_LENGTH];
strncpy(temp1[index_of_min], list[index_of_min], LINE_LENGTH);
temp1[fill][LINE_LENGTH] = *temp;
}
}
char *name;
char *cat = 0;
char *date;
for (int i = 0; i<NUM_LINES; i++){
name = strtok(NULL, ",");
cat = strtok(NULL, "h");
date = strtok(NULL, " ");
printf("%s %s %s\n", name, cat, date);
}
// for( int i =0; i<NUM_LINES; i++){
// printf("%s", list[i]);
// }
}
您傳遞給strtok
的唯一第一個參數是NULL
。 你從來沒有真正給它任何解析。 您的意思是strtok(temp1[i], ",");
?
另外,為什么沒有錯誤檢查? 使用錯誤檢查更容易在代碼中找到錯誤。
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