How to write if statement in fortran

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Added: 23.04.2021
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Fortran 95 language features

gfortran - Array of pointers in Fortran - Stack Overflow

There are three basic forms of an if statement. In its simplest form, it looks like this:. The then-body is executed only if condition is true. The condition in an if statement is considered true if its value is nonzero, and false if its value is zero. If the value of the conditional expression in an if statement is a vector or a matrix, it is considered true only if it is non-empty and all of the elements are nonzero. The conceptually equivalent code when condition is a matrix is shown below.

Introduction to Fortran

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. The same statement label may appear more than once in the same arithmetic IF statement. Execution of an arithmetic IF statement causes evaluation of the expression e followed by a transfer of control. The statement identified by s1 , s2 , or s3 is executed next as the value of e is less than zero, equal to zero, or greater than zero, respectively.
So far, the only control we have been able to exercise over the flow of a program is the ability to make it loop a specified number of times. Now we will consider what is possibly the most important construction available in a programming language: the IF construction. The IF construction is important because it allows the program to make decisions. There are two forms: the single IF statement, and the block-IF construction. The IF statement takes the form: if condition action.

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