Find the output of Java programs | Data Types | Set 2: Enhance the knowledge of Java Data Types concepts by solving and finding the output of some Java programs.
Question 1:
public class Main {
public static void main(String[] args) {
float A = 2.3;
int B = 3;
float C = 0.0;
C = A * B - 4;
System.out.printf("C : %f", C);
}
}
Question 2:
public class Main {
public static void main(String[] args) {
float A = 2.3F;
int B = 3;
int C = 0;
C = A * B - 4;
System.out.println(C);
}
}
Question 3:
public class Main {
public static void main(String[] args) {
byte A = 10;
byte B = 30;
byte C = 0;
C = A * B;
System.out.println(C);
}
}
Question 4:
public class Main {
public static void main(String[] args) {
int num = 0;
num = System.out.printf("Hello World");
System.out.println(num);
}
}
Question 5:
public class Main {
public static void main(String[] args) {
long int num1 = 10;
short int num2 = 20;
long num3 = 0;
num3 = num1 + num2 * 10 + 20;
System.out.println(num3);
}
}
Java programming
Answer Question 1:
Output:
Main.java:3: error: incompatible types: possible lossy conversion from double to float float A = 2.3; ^ Main.java:5: error: incompatible types: possible lossy conversion from double to float float C = 0.0; ^ 2 errorsExplanation:
The above program will generate syntax errors because here we assigned double values to local variables A and C. By default a floating-point number is double type, here we need to use character 'F' in suffix to represent number of float type.
The correct way is given below:
float A=2.3F; float C=0.0F;Answer Question 2:
Output:
Main.java:7: error: incompatible types: possible lossy conversion from float to int C = A * B - 4; ^ 1 errorExplanation:
The above program will generate a syntax error because of below statement,
C = A*B-4;In the above statement after evaluating the expression result will be float type but we are assigning result to the integer variable C.
The correct expression will be:
C = (int)A*B-4;Answer Question 3:
Output:
Main.java:7: error: incompatible types: possible lossy conversion from int to byte C = A * B; ^ 1 errorExplanation:
The above program will generate syntax error. In Java variable of byte type occupies 1 byte in memory. The maximum value of byte type variable is 255.
C = A*B;In the above expression multiplication of 10 and 30 will be 300 that cannot be assigned in variable C because C is byte type.
Answer Question 4:
Output:
Main.java:5: error: incompatible types: PrintStream cannot be converted to int num = System.out.printf("Hello World"); ^ 1 errorExplanation:
The above program will generate error because return type of printf() method is PrintStream that cannot be converted into integer value.
Answer Question 5:
Output:
Main.java:3: error: not a statement long int num1 = 10; ^ Main.java:3: error: ';' expected long int num1 = 10; ^ Main.java:4: error: not a statement short int num2 = 20; ^ Main.java:4: error: ';' expected short int num2 = 20; ^ 4 errorsExplanation:
The above program will generate syntax errors because long int and short int cannot not be used in Java. If we want to declare a variable of short type then we need to use short data type instead of short int.
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