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這裏是我的代碼：，適用於一個文件，而不是另一個
char delims[4];
delims[0]='\t';
delims[1]=' ';
delims[2]=',';
delims[3]='\0';
i = 0;
while (fgets(line, 10000, fp) != NULL)
{
result = strtok(line,delims);
while(result != NULL) {
(*data_array)[i++] = atof(result);
result = strtok(NULL, delims);
}
}
足夠直截了當。它完全適用於以下文件：
3.600000 79.000000
1.800000 54.000000
3.333000 74.000000
2.283000 62.000000
4.533000 85.000000
2.883000 55.000000
4.700000 88.000000
但它並不適用於這個文件的工作：
3.6 79 3
1.8 54 3
3.333 74 3
2.283 62 1
4.533 85 1
2.883 55 1
4.7 88 2
3.6 85 1
1.95 51 1
4.35 85 3
我也得到一個「中止（核心轉儲）」的錯誤。我究竟做錯了什麼？
編輯：這是整個功能。 * data_array和* data_labels只是在main（）中聲明的。我註釋掉一些data_labels部分只是讓我能得到的第一部分工作：
int getdata(double* *data_array, int* *data_labels, int argc, char *argv[], int *items, int *attr)
{
// filename variables
char *filename; // pointer to a string that will contain the name of the training data file.
char *result = NULL; // used with strtok() to extract each feature value given a line of delimited features.
FILE *fp; // pointer to FILE, we can use this with fgets to access each line
char line[10000]; // array of 1000 chars for storing the raw data for one observation
char delims[4]; // an array of common delimiters for data files
delims[0]='\t';
delims[1]=' ';
delims[2]=',';
delims[3]='\0';
int i, j;
// check that we have the correct number of command line arguments
if (argc < 2)
{
printf("2usage: progname filename\n");
return -1;
}
if (argc < 4)
{
printf("3usage: progname filename num_labels k(nn)\n");
return -1;
}
if (atoi(argv[2]) < 1)
{
printf("num_labels must be a positive integer.\n");
return -1;
}
if (atof(argv[2]) - atoi(argv[2]) > 0)
{
printf("num_labels must be an integer.\n");
return -1;
}
if (atoi(argv[3]) < 1)
{
printf("k must be a positive integer.\n");
return -1;
}
if (atof(argv[3]) - atoi(argv[3]) > 0)
{
printf("k must be an integer.\n");
return -1;
}
// try to open the file
filename = argv[1];
fp = fopen(filename, "r");
if (fp == NULL)
{
printf("could not open file: %s\n", filename);
printf("note: the filename should be the second command line argument, after the .exe file");
return -1;
}
printf("reading file: %s\n", filename);
// get first line of the file to get num_items and num_attrs.
fgets(line, 1000, fp);
sscanf(line, "%d \t %d", items, attr);
printf("num items: %d\n", *items);
printf("num attributes: %d\n", *attr);
if (atoi(argv[3]) > *items)
{
printf("k should be smaller than the number of items in the input file.\n");
return -1;
}
// create an array of the data
*data_array = malloc(*items* *attr*sizeof(double));
*data_labels = malloc(*items*sizeof(int));
printf("data array size = %d\n\n",*items* *attr);
i=0;
j=0;
while (fgets(line, 10000, fp) != NULL)
{
// we break line into tokens using our delimeters list declared at the beginning of the function
result = strtok(line,delims);
//printf("%d\n",i);
while(result != NULL) {
(*data_array)[i++] = atof(result);
//printf("%f\n",(*data_array)[i-1]);
result = strtok(NULL, delims);
}
//(*data_labels)[j++] = (int)((*data_array)[--i]);
}
/*
printf("j=%d,items=%d\n",j,*items);
for (i=0;i<*items;i++)
{
printf("i=%d,items=%d,",i,*items);
printf("label=%d\n",(*data_labels)[i]);
}
// close the file
fclose(fp);
return 0;
}
'* data_array）'的大小和類型是什麼？ –
發佈一個小的，完整的，可編譯的程序來演示問題。一種可能性是你的'data_array'的大小不正確，但是不能從你發佈的內容中真正知道。 –
我刪除了我的答案，因爲我猜的錯誤是你的表達式'（* data_array）[i ++] = atof（result）;'是正確的，你可能有長度問題。那就是緩衝區溢出以避免在賦值之前添加一個檢查'i <（* items * * attr * sizeof（double）'）。 –