The following questions are based on what we have learned so far in Chapter 9 – Conditionals in C. To test your understanding, try answering the following questions. The explanations are also provided to each question so you can always check the correctness of your answers. All the best 👍
What is the primary purpose of using conditional statements in C?
the primary purpose of conditional statements in C is to execute a certain code based on a condition.
Which of the following expressions is valid in a switch statement?
the switch statement allows only integral types (int and char) as case expressions.
What is the purpose of the default case in a switch statement?
the default case is executed when none of the previous cases match the value in the switch expression.
What is the result of the condition: (10 > 5) && (7 < 3)?
The && (logical AND) operator requires both conditions to be true for the overall expression to be true.
Determine the output of the following C program:
#include <stdio.h>
int main() {
int x = 10, y = 0;
if (y != 0)
if (x != 0)
printf("%.2f", x/y);
else
printf("Division by zero!");
return 0;
}This issue is known as the dangling else problem. It looks like the else block is part of the outer if statement (through the way the code is indented), but C follows the rule that the else block always belongs to the nearest if statement. So, if y is 0, nothing is printed.
Let us suppose that x and y are the two variables where the type of x is int and that of y is float. What will be the type of the conditional statement (x > y ? x : y)?
When there is a type mismatch like this, then the type of the conditional statement depends upon the common type that can accommodate both x and y. Therefore, the type of the conditional statement (x > y ? x : y) is float because float type can represent both int and float types.
Consider the following if statement:
if (x >= 1 <= 20)
printf(“1 lies between %d and 20”, x);Is the above if statement legal (assuming the value of x is 10)?
The if statement is legal, but it may not work as intended. Let’s break down the evaluation to understand this better:
1. (x >= 1) is evaluated which gives True (1 in C).
2. Then, (1 <= 20) is evaluated to True.
Hence, the final output is “1 lies between 10 and 20.” which is logically not correct. However, syntactically, there is no issue in the above code.
In a switch statement, what will happen if there is no break statement after a case?
Without a break statement, the control will fall through to the next case, and subsequent code will be executed until the break statement or the end of the switch statement is reached.
Consider the following code:
int x = 15;
int result = (x > 10) ? (x * 2) : (x / 2);What will be the value of the result variable?
Since x is greater than 10, therefore (x * 2) is evaluated, resulting in 20.
In a compound condition, what does the short-circuit evaluation mean?
Short-circuit evaluation involves evaluating only the conditions necessary to determine the overall outcome of a compound condition.
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