program freezing

I've been trying to implement the strcmp method, but the following code causes my program to freeze - most specifically, i've narrow it down to the line in bold.

Code:

---

for(ii = 0; ii < stackSize; ii++) {
        fgets(aa[ii], LINE_SZ, stdin);

        if(strcmp(aa[ii][0], "<") != 0) {
            printf("Bad input.\n");
            ii--;
        }       
}

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How do I properly implement strcmp? I'm trying to see if the first character of each input line is "<" or not.

If it's the first character, it's not a string is it? Either use strncmp() or:

Code:

---

if(aa[ii][0] == '<')
{

---

Thanks!