FORTRAN Flashcards
!text
Comments
print *, ‘text’
Outputs ‘text’ to the screen
*
means use the default number of decimal places when the number is written to the screen
What is the significance of ‘implicit none’
By including it in your program, FORTRAN will check that you have properly declared all your variable types.
Translate: x=2
store the value “2” in memory location “x”
Translate: y=3
store the value “3” in memory location “y”
Translate: z=x+y
Add the values stored in memory location “x” and “y” and store the result in memory location “z”
How many variable names can be on the left hand side of an equals sign
One!
+ , -
plus and minus
- , /
multiply and divide
**
exponentiation (raise to the power)
( )
brackets
Does FORTRAN follow the order of operations?
yes
sin(x)
sine
cos(x)
cosine
tan(x)
tangent
atan(x)
arctangent
abs(x)
absolute value
sqrt(x)
square root
exp(x)
e^x
log(x)
log base 10 of x
Are trigonometric functions calculated in radians or degrees?
radians
if … end if
if (condition is true) then
execute this line
and this
and so on until we get to ...
end if==
equal to
=
assignment of value
if, else, endif
if (choice == 1) then
do something
else if (choice == 2) then
do something else
else
do this if nothing else satisfies the conditions
end if/=
not equal to
<
less than
<=
less than or equal to
>
greater than
> =
greater than or equal to
.and.
combine two “if ( ) then” statements
.or.
combine two “if ( ) then” statements
stop
command stops the program
do i=0,20
i is called a loop counter. each time the statements are executed,t he loop counter, i, is incremented by 1. When the value of i is 20, the loop terminates, and the program resumes after the end do.
do i=50,70,2 !What is “2” in this line?
2 is the increment step
translate: x=x+1.0
Add 1.0 to the value currently stored in memory location”x” and then store the result in memory location “x.”
mod
“mod” returns the remained of the first argument divided by the second.
What is the number of decimal precision for “single precision”?
6
