Section 7.11 Check Point Questions3 questions

7.11.1

What are the differences between the following arrays?

char s1[] = {'a', 'b', 'c'};
char s2[] = "abc";

7.11.2

Suppose s1 and s2 are defined as follows:

char s1[] = "abc";
char s2[] = "efg";

Are the following expressions/statements correct?

a. s1 = "good"
b. s1 < s2
c. s1[0]
d. s1[0] < s2[0]
e. strcpy(s1, s2) 
f. strcmp(s1, s2)
g. strlen(s1)

7.11.3

Why is the following code incorrect? How do you fix it?

char s[80] = "abc 123 aABC";
int count = 0;
for (int i = 0; i < 80; i++) 
{
  if (isalpha(s[i])) count++;
}
cout << "The number of letters in s is " << count << endl;