2.1 programming building blocks
write the code to declare a boolean variable named a and assign a the value false.
boolean a = false;
what is the output of this code sequence? float a = 13f; System.out.println( a );
13.0 or 13
What is the output of this code sequence? int a = 13 % 5; System.out.println( a );
3
what is the output of this code sequence? int a = 5; System.out.println( a-- );
5
where is the error in this code sequence? double a = 45.2; float b = a;
cannot assign a double to a float variable (possible loss of precision).
what is the output of this code sequence? double a = 12.5; System.out.println( a );
12.5
write the code to calculate the average of two int variables a and b and print the result. The average should be printed as a floating-point number.
double average = (a + b)/2.0; System.out.println("Average = " + average);
where is the error in this code sequence? int a = 5; a - = 4;
there should not be a space between - and =.
what is the output of this code sequence? int a = 12 / ( 6 * 2 ); System.out.println( a );
1
what is the output of this code sequence? int a = 5; a /= 6; System.out.println( a );
0
write the code to declare a char variable named a and assign a the character B
CHAR A = B
write the code to declare a float variable named a and assign a the value 34.2?
FLOAT A = 34.2
write the code to calculate the total of three int variables a, b, and c and print the result.
int a = 3; int b = 5; int c = 8; System.out.println(a+b+c);
what is the valid way to declare an integer variable named a?
int a;
What is the output of this code sequence? double a = (double) (12) / 5; System.out.println( 0 );
2
what is the output of this code sequence? double a = (double) (12 / 5); System.out.println( a );
2
what is the output of this code sequence? int a = (int) 12.0 / 5; System.out.println( a );
2
what is the output of this code sequence? int a = 13 / 5; System.out.println( a );
2
What is the output of this code sequence? double a = 13 / 5; System.out.println( a );
2.0
what is the output of this code sequence? double a = 12.0 / 5; System.out.println( a );
2.0
what is the output of this code sequence? int a = 12 / 6 * 2; System.out.println( a );
4
what is the output of this code sequence? int a = 5; System.out.println( --a);
4
What is the output of this code sequence? int a = ( 4 + 6 ) / 2; System.out.println( a );
5
What is the output of this code sequence? int a = 5; a++; System.out.println( a );
6
what is the output of this code sequence? int a = 6; System.out.println( a );
6
What is the output of this code sequence? int a = 4 + 6 / 2; System.out.println( a );
7
what is the output of this code sequence? int a = 5; a += 2; System.out.println( a );
7
write the code to assign the value 10 to an int variable named a.
INT A = 10 int a;
write the code to calculate and print the remainder of the division of two int variables with the values 10 and 3 (the value printed will be 1).
System.out.println(a%b);
given there declared and initialized int variables a, b, and c, which of the following statements are valid?
a = b;, a = 67, b = 8.7; , c = a - b; and c = a / 2.3; , a += c;
which of the following identifiers are valid?
a, sales, sales&profit, inter, doubleSales, TAX_RATE.