Read int and char from the same file in C - c

Question

I have a text file that looks like this:
i 3755
i 3633
i 4435
i 1434
how would I go about reading this as an input, I've tried using fscanf, but it keeps on giving me a random character after the 'i'
for example output would look like
i% 3755
i5 3633
etc.
Here is what I've been trying:
int data = 0;
char command;
if(fptr==NULL)
printf("File Cannot Be Read");
fscanf(fptr,"%c %d\n", &command, &data);
printf("%c " , command);
printf("%d\n" , data);
fscanf(fptr,"%s %d\n", &command, &data);
printf("%c " , command);
printf("%d\n" , data);
fscanf(fptr,"%s %d\n", &command, &data);
printf("%s " , command);
printf("%d\n" , data);
none of them seem to work. Thanks for your help in advance!
edit: Heres the working code for anybody that was having the same problem:
int data = 0;
char command;
fptr = fopen(argv[1], "r");
if(fptr==NULL)
printf("File Cannot Be Read");
while(fscanf(fptr,"%c %d \n", &command, &data) == 2)
{
if(command == 'i')
{
printf("insert found\n");
}
if(command == 'd')
{
printf("delete found\n");
}
}
}

Answer 1

fscanf(fptr,"%c %d", command, &data);
should be:
fscanf(fptr,"%c %d", &command, &data);
getchar(); // consume the newline character that fscanf left.
Assuming you defined:
char command;
int data;

Answer 2

For simplicity, I would recommend you to, in a loop, read a line using fgets() and then use strtok() to get different 'strings' and then cast according to your parsing methodology. But Mike is right as well, you can use fscanf(fptr, "%c %d\n", &command, &data) to read. When you're using a string, you can ignore the usage of "&" before the variable name. But when its a character or an integer or a float.. you will need to use the address of operator("&")

Answer 3

at this line :
fscanf(fptr,"%c %d", command, &data);
you should give it a pointer to command. like this :
fscanf(fptr,"%c %d", &command, &data);
the next line can't work because the reading cursor is already at the end of the file.

Answer 4

This is incorrect and will result in a buffer overrun:
fscanf(fptr,"%s %d", &command, &data);
as command has only enough space for a single char but fscanf() with format specifier "%s" will read until next whitespace and then write a terminating null character into command. Use a char[] to read and restrict the number of chars to be read.
Note that the NULL check just prints an error message, it does not actually prevent use of a NULL file pointer.
To ensure that each line is of the correct format use fgets() to read a line and then use sscanf() to read the fields. If fscanf() is used to read directly from the file then these two lines:
i
3755
are treated identically to the single line:
i 3755
as a new-line character is also whitespace.
Example:
if (fptr)
{
char line[1024];
while (fgets(line, 1024, fptr))
{
char command;
int data;
if (2 == sscanf(line, "%c %d", &command, &data))
{
/* Use 'command' and 'data'. */
}
}
}

Answer 5

in your fscanf function you have to expect the return to line by adding space at the end of format. Like this
fscanf(fptr,"%c %d ", &command, &data);
The space character replaces return to new line, tabulation and spaces
BTW I see that you use %s to read a char &command and this is incorrect
fscanf(fptr,"%s %d\n", &command, &data);
you have to use this instead
fscanf(fptr,"%c %d ", &command, &data);