## What is the difference between function and subroutine?

A function commonly carries out some calculations and reports the result to the caller. Subroutines perform a task but do not report anything to the calling program. A function cannot change the value of the actual arguments . A subroutine can change the value of the actual argument.

## What are the different types of functions used in Fortran 90 95?

Procedures. Fortran has 2 types of procedures: functions, which return a value (and usually should not modify their arguments), and subroutines, which presumably modify their arguments or have other side effects.

**What is the difference between subprogram and subroutine?**

Subprograms are program units whose purpose is to perform a specific task on behalf of another program unit, referred to as the invoking or calling program. In Fortran, functions are invoked or referenced; subroutines are called. Normally, the invoking or calling program passes on to the subprogram a set of arguments.

### How do you define a function in FORTRAN?

A FORTRAN function is a procedure whose result is a single number, logical value, character string or array. There are two types of functions, intrinsic and user-defined. Intrinsic functions are those functions built into a FORTRAN language, such as SIN(x) or LOG(x).

### What is the difference between a subroutine and a function in Fortran?

A Fortran function is similar to a mathematical function, which takes one or many parameters as inputs and returns a single output value. A Fortran subroutine is a block of code that performs some operation on the input variables, and as a result of calling the subroutine, the input variables are modified.

**What is the difference between a function and a function call?**

Using a function to do a particular task any point in program is called as function call. So the difference between the function and function call is, A function is procedure to achieve a particular result while function call is using this function to achive that task.

#### What are the different data types used in the Fortran language?

Fortran – Data Types

- Integer type.
- Real type.
- Complex type.
- Logical type.
- Character type.

#### What are different types of Fortran?

Size and Alignment of Data Types

Fortran 77 Data Type | Size |
---|---|

BYTE X CHARACTER X CHARACTER* n X | 1 1 n |

COMPLEX X COMPLEX*8 X DOUBLE COMPLEX X COMPLEX*16 X COMPLEX*32 X | 8 8 16 16 32 |

DOUBLE PRECISION X REAL X REAL*4 X REAL*8 X REAL*16 X | 8 4 4 8 16 |

INTEGER X INTEGER*2 X INTEGER*4 X INTEGER*8 X | 4 2 4 8 |

**What is the difference between a subroutine and a function Fortran?**

## Do functions in Fortran?

The DO statement repeatedly executes a set of statements. Variable of type integer, real, or double precision. Expressions of type integer, real or double precision, specifying initial, limit, and increment values respectively.

## What is the difference between subroutines and functions in Fortran?

I was under the impression that the main differences between subroutines and functions in Fortran was that functions returned values, while subroutines change some or all of the values passed as arguments. But then I learned that you could modify variables passed in to functions as arguments too.

**How many types of subprograms are there in Fortran 90?**

zFortran 90 has two types of subprograms,Fortran 90 has two types of subprograms, functions and subroutines. zAFortran90functionisafunctionlikethoseinA Fortran 90 function is a function like those in C/C++. Thus, a function returns a computed result via the function nameresult via the function name.

### What is a function in Fortran 90?

zAFortran90functionisafunctionlikethoseinA Fortran 90 function is a function like those in C/C++. Thus, a function returns a computed result via the function nameresult via the function name. zIf a function does not have to return a function vallue, use subtibroutine.

### Can We define our own functions in Fortran?

We can also define our own functions – they work in a similar way to subroutines. As an example, let’s write a program ( func.f95) that does some trigonometry. As you know, the trig routines in FORTRAN use radians, not degrees – so it would be nice to write a function that does all the conversion for us.

https://www.youtube.com/watch?v=noo8GEsAS5Q