从文件中读取字符串，将它们转换为整数，并将它们放入 C 中的数组中

Question

我需要读取一个输入文件，使用 strtok 对其进行解析，然后将数字转换为数组中的整数。现在，它只读取输入文件的第一行，并将第一个数字复制到数组中，直到达到 MAX_SIZE。计数是为了跟踪输入文件中有多少数字。我只需要它到达每一行。为什么只复制第一行？

718321747   -1828022042
-1665405912 -175307986
-53757018 -1551069786 525902369
-1945908378 853648883

#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 10

int main(int argc, char* argv[])
{
    char buffer[50];
    char* token;
    char* endptr;
    char* pointer;
    int count = 0;
    int arr[MAX_SIZE];

    if (argc != 2)
    {
        printf("Invalid number of arguments\n");
        return 0;
    }
    //open file
    FILE* fptr = fopen(argv[1], "r");
    if (fptr == NULL)
    {
        printf("Unable to open file\n");
        return 0;
    }
    //to get string line by line
    while((fgets(buffer, 50, fptr) != NULL) && (count < MAX_SIZE))
    {
        pointer = buffer;
        //to parse line
        while(((token = strtok(buffer, "\n\t ")) != NULL) && (count < MAX_SIZE))
        {
            //to convert token to int
            arr[count] = strtol(token, &endptr, 10);
            printf("%d\n", arr[count]);
            if (*endptr != '[=11=]')
            {
                printf("Could not convert %s to integer\n", token);
            }
            else count++;
            pointer = NULL;
        }
    }
    fclose(fptr);
}

/*Sample output
-722170550
-722170550
-722170550
-722170550
-722170550
-722170550
-722170550
-722170550
-722170550
-722170550
-722170550
*/

Answer 1

这就是解决方案

#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 10

int main(int argc, char* argv[])
{
    int count = 0;
    int arr[MAX_SIZE];
    int value;

    if (argc != 2)
    {
        printf("Invalid number of arguments\n");
        return 0;
    }
    //open file
    FILE* fptr = fopen(argv[1], "r");
    if (fptr == NULL)
    {
        printf("Unable to open file\n");
        return 0;
    }

    //to get string line by line
    while ((fscanf(fptr, "%d", &value) == 1) && (count < MAX_SIZE))
        arr[count++] = value;
    fclose(fptr);
}

Answer 2

改变

while(((token = strtok(buffer, "\n\t ")) != NULL) && (count < MAX_SIZE))

到

while(((token = strtok(pointer, "\n\t ")) != NULL) && (count < MAX_SIZE))

您忘记将 buffer 替换为 pointer。

从文件中读取字符串，将它们转换为整数，并将它们放入 C 中的数组中

Reading strings from a file, coverting them to ints, and putting them in an array in C

c

arrays

strtok