将文件中的字符串和整数扫描到 C 中的数组中

Question

I am scanning from a file into parallel arrays. I successfully scan the strings, but the ints and floats do not scan correctly! What is going wrong here??? Num, human, and cool are arrays declared in the main function.

An example of a record in hello.txt: Angela, Merkel, 50, 10, 9.1

void read(int *lines, char first[ENTRY][FIRST], char last[ENTRY][LAST], int *num, int *human, float *cool)
{
FILE *ifile;
int i;

ifile = fopen("hello.txt", "r");

fscanf(ifile, "%[^,] %*c %[^,] %*c %d %*c %d %*c %f", first[0], last[0], &num[0], &human[0], &cool[0]);

printf("%s", first[0]);
printf("%s\n", last[0]);
printf("%d\n", num[0]);
printf("%d\n", human[0]);
printf("%f", cool[0]);



fclose(ifile);
}

Answer 1

尝试

fscanf(ifile, "%[^,] %*c %[^,] %*c %d %*c %d %*c %f", first[0], last[0], num, human, cool);

Answer 2

First, with scanf family of functions, a space matches any amount of white space, including none, in the input, also don't use %*c , it is not necessary. Second, you need to specify the comma in format string to successfully scan the fields. Third, when you scanf always check its return value to make sure the expected number fields were input. Try this fix:

void read(int *lines, char first[ENTRY][FIRST], char last[ENTRY][LAST], int *num, int *human, float *cool)
{
    FILE *ifile;

    ifile = fopen("hello.txt", "r");
    if (ifile == NULL) return;

    int ret = fscanf(ifile, "%[^,], %[^,], %d, %d, %f", first[0], last[0], &num[0], &human[0], &cool[0]);
    if (ret != 5) { // input file does not match the format
        return;
    }

    printf("%s ", first[0]);
    printf("%s\n", last[0]);
    printf("%d\n", num[0]);
    printf("%d\n", human[0]);
    printf("%f\n", cool[0]);

    fclose(ifile);
}