fortran a compiled imperativeprogramming language famous as the firstever high-level language designed forhumans it was developed in the 1950s atibm by john bakkus a guy who was toolazy to write assembly for the ibm 704mainframe computer the haters said itwould never be as performant ashand-coded programs but by 1957 formulatranslator became the first computerlanguage standard at the time computerswere extremely rare but fortran was ahuge technical breakthrough because forthe first time ever people outside thecomputer science realm could actuallyuse a computer most importantly thelanguage implemented the firstoptimizing compiler which was able toproduce machine code just as fast asanything coded by hand the language hasevolved into many different versionsover the years and is still in use todayprimarily for heavy duty numbercrunching and scientific computing whenyour grandma wrote fortran back in the70s she didn't have access to fancytools like editors and terminals andinstead wrote her code on a punch cardeach card represents one line of codeand is kept neatly in a stack where itcan then be fed into a card reader to becompiled the modern developer can getstarted by installing the fortrancompiler then create a file ending in for f95 to specify a certain version likefortran 95 use the program keyword togive your app a name in older versionskeywords used all caps because the shiftkey didn't exist on punch card machinesuntil the 1970s declare variables bystarting with a type followed by a nameand optionally a default value anyvariable names that start with ijklmnwill automatically be consideredintegers to disable this ancient featureuse the implicit nun directive at thetop use the character type to create astring by declaring it with a fixedmaximum length now print that value tothe standard output using the executablestatement of print star in addition thedimension keyword can be used to createan array of numbers and multipledimensions will create a matrix just becareful not to allocate too much memorybecause your apple ii only has fourkilobytes of ram early versions of thelanguage didn't perform fine-grainedmemory management but modern versionssupport pointers that can manuallyallocate and de-allocate memory but thereal killer feature of fortran when itcame out in the 50s is the ability toperform loops perform loose performloose the do and do while loops made itrelatively easy for anybody to tell acomputer how to do something multipletimes on top of that fortran also madecode reusable with procedures a functionprocedure takes immutable argumentsperforms some kind of calculation thenreturns a value it can be called withits name elsewhere in the code asubroutine is another type of procedurewhich can take mutable arguments butdoes not provide a return value now useyour favorite implementation of thecompiler to convert your code into anexecutable binary this has been fortranand 100 seconds let me know if you wantto see a full tutorial in the commentsthanks for watching and i will see youin the next one