The following questions are based on what we have learned so far in Chapter 8 – Operators 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 👍
State whether the following statement is True or False.
“Unary operators have the highest precedence among all the operators.”
It is not the case that unary operators have the highest precedence among all the operators. Parentheses and increment/decrement operators have greater precedence than unary operators. Refer to the table given in this tutorial for more information.
Can we use floating-point operands with the modulus (%) operator?
Modulus operator (%) requires integer operands, hence we cannot use floating-point operands with it.
Consider the following code snippet:
int i;
float f;
i = 2.1456f;
f = 10What are the final values of i and f?
Consider the assignment expression x = y. If x and y are of different types, then the value of y will be converted to the type of the x. This is the reason why 2.1456 is converted to 2 as it is assigned to an integer variable, and 10 is converted to 10.0 as it is assigned to a float variable.
Consider the following code snippet:
int i;
float f;
f = i = 3.33;What is the final value of f?
The assignment operator is right-associative; therefore, the order of evaluation is right to left. First, 3.33 is assigned to ‘i’. Since ‘i’ is an integer variable, the type of 3.33 is converted to an integer, which means 3 is stored in the variable ‘i’. Similarly, ‘f’ is a float variable; hence, 3.0 is stored in the variable ‘f’. Therefore, the final value of ‘f’ is 3.0.
Consider the following expression:
a * b - c * d / eWhich of the following expression is equivalent to the above expression?
According to the instructions, multiplication and division have a higher precedence than subtraction. The order of evaluation is from left to right. The first option is the only option that satisfies these criteria, therefore it is the correct answer.
Determine the output of the following program:
#include <stdio.h>
int main() {
int i = 1;
int j = ++i + 50 * 2;
printf("%d %d", i, j);
return 0;
}j = ++i + 50 * 2
j = 2 + 50 * 2 [pre-increment]
j = 2 + 100 [multiplication has greater precedence than addition]
j = 102At the end, i = 2 (as i is incremented in the expression evaluation) and j = 102.
Determine the output of the following program:
#include <stdio.h>
int main() {
int i = 1;
int j = i++ + 50 * 2;
printf("%d %d", i, j);
return 0;
}j = i++ + 50 * 2
j = 1 + 50 * 2 [increment will happen after expression evaluation]
j = 1 + 100 [multiplication has greater precedence than addition]
j = 101At the end, i = 2 (as i is incremented in the expression evaluation) and j = 101.
Determine the output of the following program:
#include <stdio.h>
int main() {
printf("%d", !(10 > 5) && (2 != 2) || (3 >= 3));
return 0;
}!(10 > 5) && (2 != 2) || (3 >= 3)
!(1) && (0) || (1)
0 && 0 || 1
0 || 1
1Determine the output of the following program:
#include <stdio.h>
int main() {
int i = 1, j = 2;
printf("%d", ++i + (j = i > 0));
return 0;
}++i + (j = i > 0)
2 + (j = 1)
2 + 1
3Determine the output of the following program:
#include <stdio.h>
int main() {
int i = 1, j = 2;
printf("%d", !!i + !j);
return 0;
}!!i + !j
!0 + !2
1 + 0
1
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