Thread: How do I read only the first capital letter from a file?

That depends on what the count is supposed to be for inputs like "Foo,Bar" or "Foo-Bar" (note the absence of space).

But, generally speaking you need to count the uppercase letters if they are the first character in the file, or if they immediately follow a character that is whitespace or punctuation.

Grumpy already put you on the right track. I add that you could take advantage of two functions from the C standard library, namely isupper() and isspace(), defined in the ctype.h include.

Code:

#include <stdio.h>
#include <ctype.h>

#define MAX 100

int main() {
    FILE *f = fopen( "text.txt", "r" );
    char letters[MAX] = "";
    int i, count=0;

    if( f == NULL ) {
        printf( "\n\nFile not opened!\n\n" );
        return 0;
    }

    fgets( letters, MAX, f );

    /*
    Let's verify each character of letters[]. Whenever a character
    is uppercase, we need to verify that the previous one is a space,
    unless it's the first one in the string. We take advantage of two
    functions from the ctype.h include here (isupper() and isspace()).
    Whenever the "i==0" or the "isspace(letters[i-1])" condition is true,
    1 is added to count (in C, true equals to 1 and false equals to 0).
    */

    for( i=0; letters[i]; ++i )
        if( isupper(letters[i]) )
            count += i==0 || isspace(letters[i-1]);

    printf( "\n\n%d\n\n", count );

    return 0;
}

I hope this is not regarded as "spoon feeding" (I think it is not, but who knows?).