% Title: Obligatorisk oppgave - IN3230/IN4230 - H?st 2022
% Author: Kristjon Ciko kristjoc@ifi.uio.no
% ------
% Name:
% Username:
% Submission date:
% Course code:
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1. What does this function return?
1 int f1(int a, int b) {
2 return (a>b?a:b)
3 }
A. compiler error
B. the smaller value of the two passed parameters
C. the greater value of the two passed parameters
D. runtime error
Answer:
Explanation:
2. Which is not a correct way to declare a string variable?
A. char str = "Hei IN3230"
B. char *str = "Hei IN3230"
C. char str[20] = {'H', 'e', 'i', ' ', 'I', 'N', '3', '2', '3', '0', '\0'};
D. char str[] = "Hei IN3230";
Answer:
Explanation:
3. Which function do you use to deallocate memory?
A. dalloc()
B. release()
C. free()
D. dealloc()
Answer:
Explanation:
4. In which segment does dynamic memory allocation take place?
A. BSS segment
B. stack
C. data segment
D. heap
Answer:
Explanation:
5. What is not a valid command with this declaration?
1 char *string[20] = {"one", "two", "three"};
A. printf("%c", string[1][2]);
B. printf("%s", string[1][2]);
C. printf(string[1]);
D. printf("%s", string[1]);
Answer:
Explanation:
6. Void pointer vptr is assigned the address of float variable g. What is a valid way to dereference vptr to assign its pointed value to a float variable named f later in the program?
1 float g;
2 void *vptr = &g;
A. f = *(float)vptr;
B. f = (float)*vptr;
C. f = *(float *)vptr;
D. f = (float *)vptr;
Answer:
Explanation:
7. What does the strcmp(str1, str2); function return?
A. ? true (1) if str1 and str2 are the same ? NULL if str1 and str2 are not the same
B. ? 0 if str1 and str2 are the same ? a negative number if str1 is less than str2 ? a positive number if str1 is greater than str2
C. ? true (1) if str1 and str2 are the same ? false (0) if str1 and str2 are not the same
D. ? 0 if str1 and str2 are the same ? a negative number if str2 is less than str1 ? a positive number if str2 is greater than str1
Answer:
Explanation:
8. How many times does the code inside the while loop get executed in this program?
1 void main() {
2 int x=1;
3 while (x++<100) {
4 x*=x;
5 if (×<10) continue;
6 if (x>50) break;
7 }
8 }
A. 5
B. 50
C. 100
D. 3
Answer:
Explanation:
9. Which choice is an include guard for the header file mylib.h?
A.
#ifndef MYLIB_H
#define MYLIB_H
//mylib.h content
#endif /* MYLIB_H */
B.
#define MYLIB_H
#include "mylib.h"
#undef MYLIB_H
C.
#ifdef MYLIB_H
#define MYLIB_H
//mylib.h content
#endif /* MYLIB_H */
D.
#ifdef MYLIB_H
#undef MYLIB_H
//mylib.h content
#endif /* MYLIB_H */
Answer:
Explanation:
10. What is the sequence printed by the following program?
1 #include <stdio.h>
2
3 void print_3_ints(int *ip)
4 {
5 printf("%d %d %d ", ip[0], ip[1], ip[2]);
6 }
7
8
9 int main(void)
10 {
11 int array[] = { 5, 23, 119, 17 };
12 int *p, *q, d;
13
14 p = array; q = p + 1;
15
16 print_3_ints(q);
17
18 d = *(p++);
19 printf("%d ", d);
20
21 d = ++(*p);
22 printf("%d ", d);
23
24 printf("\n");
25 return 0;
26 }
A. 23 119 17 5 24
B. 23 119 17 23 24
C. 24 120 18 6 25
D. 25 120 18 25 26
Answer:
Explanation:
11. What is the output of the following program?
1 #include <stdio.h>
2
3 void func(int *ptr)
4 {
5 *ptr = 30;
6 }
7
8 int main()
9 {
10 int y = 20;
11 func(&y);
12 printf("%d\n", y);
13
14 return 0;
15 }
A. 20
B. 30
C. Compiler error
D. Runtime error
Answer:
Explanation:
12. What is the output of the following program?
1 #include <stdio.h>
2 #include <stdlib.h>
3
4 int main()
5 {
6 int i, numbers[1];
7 numbers[0] = 15;
8 free(numbers);
9 printf("Stored integers are ");
10 printf("numbers[%d] = %d ", 0, numbers[0]);
11
12 return 0;
13 }
A. Runtime error
B. Compilation error
C. 0
D. Garbage value
Answer:
Explanation:
13. What is the error of this program?
1 #include <stdio.h>
2 #include <stdlib.h>
3
4 int main()
5 {
6 char *ptr;
7 *ptr = (char)malloc(8);
8 strcpy(ptr, "RAM");
9 printf("%s", ptr);
10 free(ptr);
11 return 0;
12 }
A. Error in strcpy() statement.
B. Error in *ptr = (char)malloc(8);
C. Error in free(ptr);
D. No error
Answer:
Explanation:
14. What is the output of the following program?
1 #include <stdio.h>
2
3 struct result{
4 char sub[20];
5 int marks;
6 };
7
8 int main()
9 {
10 struct result res[] = {
11 {"IN3230",100},
12 {"IN4230",90},
13 {"Norsk",85}};
14
15 printf("%s ", res[1].sub);
16
17 printf("%d\n", (*(res+2)).marks);
18
19 return 0;
20 }
A. IN3230 100
B. IN4230 85
C. IN4230 90
D. Norsk 100
Answer:
Explanation:
15. What is the output of this code snippet?
1 void main()
2 {
3 struct bitfields {
4 int bits_1: 2;
5 int bits_2: 9;
6 int bits_3: 6;
7 int bits_4: 1;
8 }bit;
9
10 printf("%d\n", sizeof(bit));
11 }
A. 2
B. 3
C. 4
D. 0
Answer:
Explanation:
16. In which line is the BUG in the following program?
1 #include <stdio.h>
2
3 int main()
4 {
5 int a, *ptr;
6 a = 25;
7 *ptr = a + 5;
8
9 return 0;
10 }
Answer:
Explanation:
17. In which line is the BUG in the following program?
1 #include <stdio.h>
2 struct var {
3 int value;
4 int *address;
5 };
6
7 int main()
8 {
9 struct var y;
10 int a = 10;
11 int *ptr = &a;
12
13 y.value = *ptr;
14 (&y)->address = ptr;
15
16 printf("value %d\n", y.value);
17 printf("address %p\n", y->address);
18 return 0;
19 }
Answer:
Explanation:
18. What are the two mistakes in the following program?
1 #include <stdio.h>
2
3 int main () {
4 const char src[8] = "IN3230";
5 char dest[8];
6
7 strcpy(dest, "Hellllo");
8
9 memcpy(dest, src, strlen(src));
10
11 printf("%s\n", dest);
12 return(0);
13 }
Answer:
Explanation: