How do I log in Fortran?

How do I log in Fortran?

LOG(X) computes the natural logarithm of X , i.e. the logarithm to the base e. The type shall be REAL or COMPLEX . Return value: The return value is of type REAL or COMPLEX .

How do you calculate absolute value in Fortran?

ABS(A) computes the absolute value of A . The type of the argument shall be an INTEGER , REAL , or COMPLEX . Return value: The return value is of the same type and kind as the argument except the return value is REAL for a COMPLEX argument.

What is alog in Fortran?

alog returns the real natural logarithm of its real argument. dlog returns the double-precision natural logarithm of its double-precision argument. qlog returns the real*16 natural logarithm of its real*16 argument. The argument of alog, dlog, and qlog must be greater than zero.

What is Dlog in Fortran?

DLOG (or DLOG’) or DLOG10 DLOG calculates the natural logarithm of a positive longreal number; DLOG10 calculates the base 10 logarithm of a positive longreal number.

How do you write power in FORTRAN?

In addition to addition +, subtraction -, multiplication * and division /, Fortran has an exponential operator **. Thus, raising X to the Y-th power is written as X**Y. For example, the square of 5 is 5**2, and the square root of 5 is 5**0.5. The exponential operator has the highest priority.

How do you write an if statement in FORTRAN?

The block IF statement evaluates a logical expression and, if the logical expression is true, it executes a set of statements called the IF block. If the logical expression is false, control transfers to the next ELSE , ELSE IF , or END IF statement at the same IF -level.

How do you write exponential in Fortran?

8.102 EXP — Exponential function EXP(X) computes the base e exponential of X . The type shall be REAL or COMPLEX . Return value: The return value has same type and kind as X .

How do you write 10 to the power in Fortran?

A double-precision exponent consists of the letter D , followed by an optional plus or minus sign, followed by an integer. A double-precision exponent denotes a power of 10. The value of a double-precision constant is the product of that power of 10 and the constant that precedes the D .

What is FORTRAN control statement?

Loop Control Statements Fortran supports the following control statements. If the exit statement is executed, the loop is exited, and the execution of the program continues at the first executable statement after the end do statement.

Where is FORTRAN 90?

The where statement was introduced in FORTRAN 90 to aid in operations involving arrays. It provides a way to mask the assignment of arrays or the evaluations of arrays.

How to name a function in FORTRAN 77?

Older programs often use “alog” and “alog10” to start the function name with a letter characteristic of a real rather than integer value. In general Fortran 77 was more dependent on you specifically picking a function appropriate for the argument types and type of value to be returned.

How to calculate the natural logarithm of X in Fortran?

LOG(X) computes the natural logarithm of X, i.e. the logarithm to the base e. Fortran 77 and later, has GNU extensions. Elemental function. RESULT = LOG(X) The return value is of type REAL or COMPLEX. The kind type parameter is the same as X. If X is COMPLEX, the imaginary part omega is in the range -pi < omega leq pi.

What is the value of cos x in FORTRAN 77?

Here cos is the cosine function, so x will be assigned the value 0.5 (if pi has been correctly defined; Fortran 77 has no built-in constants). There are many intrinsic functions in Fortran 77.

What isfortran 77?

FORTRAN 77 provides a variety of intrinsic functions which may be used in any program unit. They are subject neither to type declarations nor IMPLICIT statements. Their names are not reserved keywords but to avoid confusion, it is inadvisable to use these names as arrays, constants, variables or user-defined external subprograms.