Practical C Programming

How to do it…

1. Open the sequential file in read-only mode using the following code:

fp = fopen (argv [1],"r");

2. If the file does not exist or does not have enough permissions, an error message will be displayed and the program will terminate, as shown in the following code:

if (fp == NULL) {    printf("%s file does not exist\n", argv[1]);    exit(1); }

3. Initialize the counter that will count the number of vowels in the file to 0, as shown in the following code:

count=0;

4. One line is read from the file, as shown in the following code:

fgets(buffer, BUFFSIZE, fp);

5. Each character of the line is accessed and checked for any lowercase or uppercase vowels, as shown in the following code:

if(buffer[i]=='a' || buffer[i]=='e' || buffer[i]=='i' || ...