Unit 3: Control Statements and Decision Making - Practice Quiz

1 What is the main purpose of control statements in C?

2 Which of the following is NOT a category of control statements in C?

3 Conditional statements in C execute a block of code based on the result of a:

4 In an if statement, the block of code executes only when the condition is:

5 What is the output of the following code?
c
int x = 5;
if (x > 3)
printf("Yes");

6 In an if-else statement, the else block executes when the condition is:

7 What is the output of the following code?
c
int a = 2;
if (a == 5)
printf("Equal");
else
printf("Not Equal");

8 A nested if statement means:

9 Which keyword is used to define the default case in a switch statement?

10 What happens if break is omitted after a matching case in a switch statement?

11 The expression used in a switch statement must evaluate to which type of value?

12 In a while loop, when is the condition checked?

13 How many times is the body of a do-while loop guaranteed to execute at minimum?

14 Which loop checks its condition at the end (bottom) of the loop?

15 What is the output of the following code?
c
int i = 1;
while (i <= 3) {
printf("%d", i);
i++;
}

16 In a for loop, which part is executed only once, at the very beginning?

17 How many times will the following loop print Hi?
c
for (int i = 0; i < 4; i++)
printf("Hi");

18 What does the break statement do inside a loop?

19 What does the continue statement do inside a loop?

20 The goto statement transfers control to a:

21 Which category of control statements is used to repeatedly execute a block of code based on a condition?

22 What is the value of the expression 5 > 3 && 2 < 1 in C?

23 What does the following code print?

int x = 10;
if (x = 5)
    printf("Yes");
else
    printf("No");

24 What is the output of the following code?

int a = 7;
if (a % 2 == 0)
    printf("Even");
else
    printf("Odd");

25 In the code below, which else does the inner if associate with?

if (a > 0)
    if (b > 0)
        printf("A");
else
    printf("B");

26 What is the output of the following switch statement?

int n = 2;
switch (n) {
    case 1: printf("One");
    case 2: printf("Two");
    case 3: printf("Three");
    default: printf("None");
}

27 Which data type is NOT allowed as a switch expression in C?

28 How many times does the body of this loop execute?

int i = 5;
while (i < 5) {
    printf("%d", i);
    i++;
}

29 How many times does the body of this loop execute?

int i = 5;
do {
    printf("%d", i);
    i++;
} while (i < 5);

30 What is the final value printed by this code?

int sum = 0, i = 1;
while (i <= 4) {
    sum += i;
    i++;
}
printf("%d", sum);

31 What is the output of the following code?

for (int i = 0; i < 3; i++)
    printf("%d ", i * i);

32 How many times does the following loop execute?

for (int i = 10; i > 0; i -= 3)
    printf("*");

33 What happens when all three expressions of a for loop are omitted, as in for(;;)?

34 What is the output of the following code?

for (int i = 1; i <= 5; i++) {
    if (i == 3)
        break;
    printf("%d ", i);
}

35 What is the output of the following code?

for (int i = 1; i <= 5; i++) {
    if (i % 2 == 0)
        continue;
    printf("%d ", i);
}

36 In nested loops, what does a break statement inside the inner loop terminate?

37 What is the output of the following code?

int i = 0;
start:
printf("%d ", i);
i++;
if (i < 3)
    goto start;

38 Which statement about the goto statement in C is correct?

39 What is the output of this ternary-based code?

int a = 4, b = 9;
int max = (a > b) ? a : b;
printf("%d", max);

40 What is the output of the following nested loop?

for (int i = 1; i <= 2; i++)
    for (int j = 1; j <= 2; j++)
        printf("%d%d ", i, j);

41 What is the output of the following code?

#include <stdio.h>
int main() {
    int a = 5, b = 10;
    if (a > b)
        if (a > 0)
            printf("X");
    else
        printf("Y");
    return 0;
}

42 What does this program print?

#include <stdio.h>
int main() {
    int x = 2;
    switch (x) {
        case 1: printf("1");
        case 2: printf("2");
        case 3: printf("3"); break;
        default: printf("D");
    }
    return 0;
}

43 What is the output of the following code?

#include <stdio.h>
int main() {
    int i, sum = 0;
    for (i = 1; i <= 10; i++) {
        if (i % 2 == 0) continue;
        if (i > 7) break;
        sum += i;
    }
    printf("%d", sum);
    return 0;
}

44 What is printed by this code?

#include <stdio.h>
int main() {
    int i = 5;
    do {
        printf("%d ", i);
        i -= 2;
    } while (i > 0);
    return 0;
}

45 What is the output?

#include <stdio.h>
int main() {
    int i;
    for (i = 0; i < 5; i++);
        printf("%d", i);
    return 0;
}

46 For which value of n does this print Match?

if (n > 0) {
    if (n % 3 == 0) {
        if (n % 2 != 0)
            printf("Match");
    }
}

47 What is the output of this code?

#include <stdio.h>
int main() {
    int i = 0, sum = 0;
loop:
    i++;
    if (i == 3) goto skip;
    sum += i;
skip:
    if (i < 5) goto loop;
    printf("%d", sum);
    return 0;
}

48 What is the output of the nested loop?

#include <stdio.h>
int main() {
    int i, j, c = 0;
    for (i = 1; i <= 3; i++) {
        for (j = 1; j <= 3; j++) {
            if (j == 2) break;
            c++;
        }
    }
    printf("%d", c);
    return 0;
}

49 What does the following print?

#include <stdio.h>
int main() {
    int x = 1, y = 0;
    switch (x) {
        case 1: y += 1;
        case 2: y += 2;
        default: y += 10;
        case 3: y += 3;
    }
    printf("%d", y);
    return 0;
}

50 What is the output?

#include <stdio.h>
int main() {
    int i, j;
    for (i = 0, j = 10; i < j; i++, j--)
        ;
    printf("%d %d", i, j);
    return 0;
}

51 What is the output of this program?

#include <stdio.h>
int main() {
    int i = 1;
    while (i <= 100) {
        i *= 2;
    }
    printf("%d", i);
    return 0;
}

52 What does this print for the assignment shown?

#include <stdio.h>
int main() {
    int a = 3, b = 5;
    int max = (a > b) ? a : (b > 10 ? b : a + b);
    printf("%d", max);
    return 0;
}

53 What is the output?

#include <stdio.h>
int main() {
    int i = 0;
    while (i < 5) {
        i++;
        if (i == 3) continue;
        printf("%d", i);
    }
    return 0;
}

54 Which statement about this code is correct?

int x = 2;
switch (x) {
    case 1.5: printf("A"); break;
    case 2: printf("B"); break;
}

55 What is the output of this code?

#include <stdio.h>
int main() {
    int count = 0;
    for (int i = 1; i <= 3; i++)
        for (int j = i; j <= 3; j++)
            count++;
    printf("%d", count);
    return 0;
}

56 What is printed?

#include <stdio.h>
int main() {
    int a = 0;
    if (a = 5)
        if (a == 5)
            printf("P");
        else
            printf("Q");
    else
        printf("R");
    return 0;
}

57 How many times does the body execute?

int i = 10;
while (i-- > 0) {
    // body
}

58 What does this code output?

#include <stdio.h>
int main() {
    int i = 1;
    start:
    if (i <= 3) {
        printf("%d", i);
        i++;
        goto start;
    }
    printf("End");
    return 0;
}

59 What is the output?

#include <stdio.h>
int main() {
    int x = 5, y = 5, z;
    z = x++ || ++y;
    printf("%d %d %d", x, y, z);
    return 0;
}

60 Which classification correctly groups these C control statements?

1. if, if-else, switch
2. while, do-while, for
3. break, continue, goto, return