[英]Reading strings from a file, coverting them to ints, and putting them in an array in C
我需要读取输入文件,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,它仅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个数字。 我只需要它才能到达每一行。 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 != '\0')
{
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
*/
更改
while(((token = strtok(buffer, "\n\t ")) != NULL) && (count < MAX_SIZE))
至
while(((token = strtok(pointer, "\n\t ")) != NULL) && (count < MAX_SIZE))
您忘记了将buffer
替换为pointer
。
这是解决方案
#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);
}
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