Question

If and else statements:

1a.)

Given the following declaration:

int temperature;

Write an if statement that prints the message "The number is valid" if the variable temperature is within the range of -50 trough 150 (both values excluded).

1b.)

Given the following declarations

int x;

int y;

Write an if statement that assigns 100 to x when y is equal to 0.

1c.)

Given the following declaration:

int grade;

Write an if statement that prints the message "The number is valid" if the variable grade is within the range of 0 trough 100 (both inclusive).

1d.)

Given the following declaration:

int year;

Write an if statement that prints the message "The year is not valid" if the variable year is outside the 20th century (1901 - 2000).

1e.)

Given the following declaration:

int hours;

Write an if statement that prints the message "The number is not valid" if the variable hours is outside the range of 0 trough 80 (0 and 80 are valid values).

1f.)

Given the following declarations:

int x;

int y;

Write an if-else statement that assigns 0 to x when y is equal to 10. Otherwise, it should assign 1 to x.

1g.)

Given the following declarations:

int hours;

boolean minimum;

Write an if statement that sets the variable hours to 10 when the boolean flag variable minimun is true.

Answer 1

Answers:

1a)

//&& - And - Logical operator
if(temperature>-50 && temperature<150) //-50 trough 150 (both values excluded).
{
System.out.print("The number is valid"); //using print() as a function to print
}

1b.)

//== relational operator ,equal equal to - to compare two values

if(y==0)
{
x=100;
}

1.c)

//&& - And - Logical operator
if(grade>=0 && grade<=100) //0 & 100 (both inclusive).
{
print("The number is valid");
}

1.d)

// ! - Not - Logical operator
if(!(year>=1901 && year<=2000))
{
print("The year is not valid");
}

1.e)

// ! - Not - Logical operator

if(!(hours>=0 && hours<=80))
{
print("The number is not valid");
}

1.f)

//== - Realational operator

if(y==10)
{
x=0;
}
else
{
x=1;
}

1. g)

//To compare two boolean values, we need to use == relational operator
if(minimum== true)
{
hours=10;
}