char input[256];
DFA dfa = oneA();
while(1){
    printf("nEnter an input: ");
    scanf("%s", input);
    if (strcmp(input, "quit") == 0){
        break;
    }
    printf("nResults for input "%s": ", input);
    printf("%s", DFA_execute(dfa, input) ? "true" : "false");
}

Testing DFA that recognizes exactly "zxy"
Enter an input: *zxy*
Results for input "zxy": true

Testing DFA that recognizes exactly "zxy"
Enter an input: *zxy*
zxy

Results for input "zxy": true