Question

1. Given the string variables pres, first, and last as defined in Example 9.2 provided on page 459 of your textbook, Problem Solving and Program Design in C, show what would be displayed by this code fragment. (If you do not know, you can always place this code into the proper C coding structure and compile and execute.) Make certain your call includes <stdio.h> and <string.h> and declare your variables if you are going to compile. (Hint:Refer to the text below the first paragraph on p.459 of your textbook for assistance.)

strncpy(first, pres, 2);

first[2] = '\0';

printf("%s", first);

printf("\n");

printf(" %s", strcpy(last, &pres[7]));

strncpy(first, &pres[7], 2);

first[2] = '\0';

strncpy(last, &pres[14], 2);

last[2] = '\0';

printf("\n");

printf(" %s%s\n\n", first, last);

2. Refer to these declarations when determining the effect of the statements in the following questions (record your answers for the results of each bullet):

char s5[5], s10[10], s20[20];

char aday[7] = "Sunday";

char another[9] = "Saturday";

i. strncpy(s5, another, 4);

s5[4] = '\0';

ii. strcpy(s10, &aday[3]);

iii. strlen(another)

iv. strcpy(s20, aday); strcat(s20, another);

v. Which one of the following would call somefun only if the string values of character arrays a and b were equal?

a. if (strcmp(a, b))

somefun();

b. if (strcmp(a, b) == 0)

somefun();

c. if (a == b)

somefun();

d. if (a[] == b[])

somefun();

vi. What does this program fragment display?

char x[80] = "gorilla";

char y[80] = "giraffe";

strcpy(x, y);

printf("%s %s\n", x, y);

a. What does this program fragment display?

char x[80] = "gorilla";

char y[80] = "giraffe";

strcat(x, y);

printf("%s %s\n", x, y);

Answer 1