遍历 C 中的一个字符

Question

I am from the Fortran community so forgive for asking such a simple question.

I have the following:

 char temp_line[250];
  char *line;

  // read in a file and get first line 
    line = fgets(temp_line, 250, fp) ; 

    // Now I want to iterate through each character in line 
    // my line in reality reads: "H AR    "
    // So I want to get from the loop my first increment will be H, then empty string, then "A" then "R" etc. 

    // I am doing following 
     for (int j =0; line[j] != '\0';j++) printf("%i : %s",j, &line[j])

   // the results is:

   // 0 : H AR    
   // 1 :  AR 
   // 2 : AR
   // 3 : R

Seems like it is going in reverse direction. Can somebody explain to a new C developer why this is occuring, and how I can achieve my objective?

Answer 1

%s prints a null-terminated string, ie multiple characters starting from the pointed-to one from the printf argument, until a null character is encountered.

If you want to print a single character, you need %c and then the corresponding argument to printf should be a int (or promoted char ), not a char* , so just line[j] , not &line[j] .

Also, you are meant to check the return value of fgets against null, to verify that it succeeded.