Evaluating Numerical Expressions - Computer Science
Card 0 of 9
int a = 49;
int b = 6;
``
int c = 49 % 6;
What is the value of c?
int a = 49;
int b = 6;
``
int c = 49 % 6;
What is the value of c?
The modulus (or modulo) operator returns the remainder of a division statement. It only works with integer operands. Thus, it will only return an integer result. Six is able to divide forty-eight a maximum of eight times.
And then
Thus,
The modulus (or modulo) operator returns the remainder of a division statement. It only works with integer operands. Thus, it will only return an integer result. Six is able to divide forty-eight a maximum of eight times.
And then
Thus,
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int a = 5;
a += 3.14;
Using the language C++ or Java, what will the value of a be after the above code snippet?
int a = 5;
a += 3.14;
Using the language C++ or Java, what will the value of a be after the above code snippet?
When using the plus-equals (+=) operator, the answer is cast to the type of the left-hand argument. Since a was an int, the value returned by the expression is converted to int before it is stored in a. Thus, the decimal point and any information behind the decimal is truncated.
When using the plus-equals (+=) operator, the answer is cast to the type of the left-hand argument. Since a was an int, the value returned by the expression is converted to int before it is stored in a. Thus, the decimal point and any information behind the decimal is truncated.
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Consider the following code:
int i = 85, j = 2, k = 4;
i--;
j++;
k -= 6;
i = i / j + i / k;
What is the value of i in the code above?
Consider the following code:
int i = 85, j = 2, k = 4;
i--;
j++;
k -= 6;
i = i / j + i / k;
What is the value of i in the code above?
It is probably easiest to give a running commentary on the code in order to understand it. See the comments in bold below:
int i = 85, j = 2, k = 4;
i--; // After this, i = 84
j++; // After this, j = 3
k -= 6; // After this, k = k - 6 or k = -2
/*
Consider this in several steps:
i / j = 84 / 3 = 28
i / k = 84 / -2 = -42
Thus, the final expression is:
i = 28 - 42 = -14
*/
i = i / j + i / k;
It is probably easiest to give a running commentary on the code in order to understand it. See the comments in bold below:
int i = 85, j = 2, k = 4;
i--; // After this, i = 84
j++; // After this, j = 3
k -= 6; // After this, k = k - 6 or k = -2
/*
Consider this in several steps:
i / j = 84 / 3 = 28
i / k = 84 / -2 = -42
Thus, the final expression is:
i = 28 - 42 = -14
*/
i = i / j + i / k;
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Consider the code below:
int a = 24, b = 17, c = 5, d = 7;
b = b % d + a / b;
a %= b;
a -= 12;
What is the value of a at the end of the code above?
Consider the code below:
int a = 24, b = 17, c = 5, d = 7;
b = b % d + a / b;
a %= b;
a -= 12;
What is the value of a at the end of the code above?
The easiest way to trace code like this is to provide running commentary in bold comments. See these below:
int a = 24, b = 17, c = 5, d = 7;
/*
The modulus (%) is the remainder of a division. So . . .
b % d = 17 % 7 = 3 (17 divided by 7 is 2 remainder 3.)
a / b = 1 (Remember, integer division truncates the decimal portion.)
Thus, we have:
b = 3 + 1 = 4
*/
b = b % d + a / b;
a %= b; // This is the same as a = a % d, which is a = 24 % 4 = 0 (No remainder)
a -= 12; // Remember that this is the same as a = a - 12, which is a = 0-12 or -12.
The easiest way to trace code like this is to provide running commentary in bold comments. See these below:
int a = 24, b = 17, c = 5, d = 7;
/*
The modulus (%) is the remainder of a division. So . . .
b % d = 17 % 7 = 3 (17 divided by 7 is 2 remainder 3.)
a / b = 1 (Remember, integer division truncates the decimal portion.)
Thus, we have:
b = 3 + 1 = 4
*/
b = b % d + a / b;
a %= b; // This is the same as a = a % d, which is a = 24 % 4 = 0 (No remainder)
a -= 12; // Remember that this is the same as a = a - 12, which is a = 0-12 or -12.
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What is the Unicode value for the letter "W"?
What is the Unicode value for the letter "W"?
The Unicode Standard is Java's attempt to simplify the translation of characters and symbols to input the computer can understand, while being able to work on all Java machines. The first 128 numbers (0-127, 0x0000-0x007F) are for basic Latin. Under this character encoding scheme, the letter 'W' is denoted by U+0057.
The standard for writing Unicode values is U+####, where the number is in hexadecimal format, not a base 10 number.
The Unicode Standard is Java's attempt to simplify the translation of characters and symbols to input the computer can understand, while being able to work on all Java machines. The first 128 numbers (0-127, 0x0000-0x007F) are for basic Latin. Under this character encoding scheme, the letter 'W' is denoted by U+0057.
The standard for writing Unicode values is U+####, where the number is in hexadecimal format, not a base 10 number.
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#include
using namespace std;
int main()
{
bool bin=true;
int var=bin*2 +1;
int triple=5;
int final= (bin&var) &triple;
cout<<final;
return 0;
}
What is the output of this code?
#include
using namespace std;
int main()
{
bool bin=true;
int var=bin*2 +1;
int triple=5;
int final= (bin&var) &triple;
cout<<final;
return 0;
}
What is the output of this code?
Taking a look at the first line in main, the variable bin is defined as true, which we know to be 1. We see in the next line that the variable var is 2 * bin +1. The trick here is that you can actually do math with boolean values, so the value of var is 3.
The value of triple is 5.
The the variable final asks us to AND bin and var first, then AND triple.
To do this, we can convert all three numbers into binary notation to make it easier.
1 in binary is 001.
3 in binary is 011.
5 in binary is 101.
1&3 =1.
1&5=1.
Final answer is 1.
Taking a look at the first line in main, the variable bin is defined as true, which we know to be 1. We see in the next line that the variable var is 2 * bin +1. The trick here is that you can actually do math with boolean values, so the value of var is 3.
The value of triple is 5.
The the variable final asks us to AND bin and var first, then AND triple.
To do this, we can convert all three numbers into binary notation to make it easier.
1 in binary is 001.
3 in binary is 011.
5 in binary is 101.
1&3 =1.
1&5=1.
Final answer is 1.
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int a;
a= 1+1 * 2 + 4 / 5;
System.out.println(a);
What would the code output?
int a;
a= 1+1 * 2 + 4 / 5;
System.out.println(a);
What would the code output?
The expression 1+1 * 2 + 4 / 5 can be rewritten as
1 + (1*2) + (4/5) = 1 + 2 + 0
4/5 = 0 because a is an int and when dividing ints, there are no decimals and since 4/5=0.8 we keep the ones digit which is zero.
The expression 1+1 * 2 + 4 / 5 can be rewritten as
1 + (1*2) + (4/5) = 1 + 2 + 0
4/5 = 0 because a is an int and when dividing ints, there are no decimals and since 4/5=0.8 we keep the ones digit which is zero.
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int x = 2893;
- What does the expression " x / 10 " evaluate to?
- What does the expression " x % 10 " evaluate to?
int x = 2893;
- What does the expression " x / 10 " evaluate to?
- What does the expression " x % 10 " evaluate to?
- 2893 / 10 = 289, since x is an int, it does not store the decimal value
- 2893 % 10 = 3 because the remainder of 2893/10 is 3
- 2893 / 10 = 289, since x is an int, it does not store the decimal value
- 2893 % 10 = 3 because the remainder of 2893/10 is 3
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Evaluate the mathematical equation?
Evaluate the mathematical equation?
You have to remember PEMDAS.
Multiplication and Division take precedence first
(double multiplied by an int equal a double)
Addition and Subtraction after
You have to remember PEMDAS.
Multiplication and Division take precedence first
Addition and Subtraction after
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