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#Simply fortran x64 code output how to

Keywords are special words, reserved for the language. Optimized Compiler Output Un-Optimized Output: 2 A AB+C movq -16 (rbp),rdx C.base movss 0 (rdx),xmm1 movq -32 (rbp),rsi A.base movss 0 (rsi),xmm2 movq -24 (rbp),rdi B.

It must be composed of alphanumeric characters (all the letters of the alphabet, and the digits 0 to 9) and underscores (_).įirst character of a name must be a letter. PRINT ,Area,Area (r) PRINT ,Circumference,Circumference (r) END PROGRAM Circle Non-Optimized vs. A name in Fortran must follow the following rules − IdentifierĪn identifier is a name used to identify a variable, procedure, or any other user-defined item. A token could be a keyword, an identifier, a constant, a string literal, or a symbol. Tokens are made of characters in the basic character set.

the special characters = : + blank - * / ( ).

The basic character set of Fortran contains − Fortran is case-insensitive, except for string literals. Indentation of code lines is a good practice for keeping a program readable.įortran allows both uppercase and lowercase letters. The print * command displays data on the screen. Those two variables can be set with the same style of code: temperature in degrees Fahrenheit hightemp 64 logical when weekend is. You must always use implicit none at the start of every program.Ĭomments in Fortran are started with the exclamation mark (!), as all characters after this (except in a character string) are ignored by the compiler. Simple Program Construction in Fortran » Making Decisions program pickoutfit implicit none integer hightemp logical weekend end Neither of the variables we have declared are assigned values yet. You can read and write to one or more files.

In this chapter you will study file input and output functionalities provided by Fortran.

#Simply fortran x64 code output how to

In the last chapter, you have seen how to read data from, and write data to the terminal. The implicit none statement allows the compiler to check that all your variable types are declared properly. Fortran allows you to read data from, and write data into files. When you compile and execute the above program, it produces the following result −Īll Fortran programs start with the keyword program and end with the keyword end program, followed by the name of the program.