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Basic operations with a 1-dimension array

/ Published in: Fortran
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This is an example of declaring and iterating over 1-dimension arrays in FORTRAN.

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  1. program arrays
  2.   IMPLICIT NONE
  3.   !Constant to be used in the declaration of the array
  4.   INTEGER, PARAMETER :: SIZE = 3;
  5.   INTEGER array (SIZE);
  6.   INTEGER i;
  7.   LOGICAL found;
  8.   INTEGER valueToSearch;
  9.   INTEGER sum;
  10.   INTEGER minValue, maxValue;
  11.   !Other way of declaring an array of dimension 1 and size SIZE
  12.   REAL, DIMENSION(SIZE) :: A, B
  13.   !Load and init the values of the array, describing which elements are inside.
  14.    A = (/ 8, 9, 10 /);
  15.    !Load and init the values of the array through a for each sentence
  16.    B = (/ (i, i = 1, SIZE) /)
  17.    print *,A
  18.    print *,B
  19.    !Only if both have the same dimension
  20.    A = B
  21.    print *,A
  22.   !Load and init(manually). Two examples.
  23.   DO i = 1, SIZE
  24.     array(i)=i;
  25.  END DO
  26.  
  27.    DO i = 1, SIZE
  28.     read *, array(i)
  29.  END DO
  30.  
  31.  
  32.  !Show
  33.    DO i = 1, SIZE
  34.     print *,array(i)
  35.   END DO
  36.  
  37. !Search for a value  (first apparition)
  38.    i = 1;
  39.    found = .FALSE.;
  40.    valueToSearch = 3;
  41.   do while (i<=SIZE .AND. .not. found)
  42.       if (array(i)== valueToSearch) then
  43.             print *,"(First) Found value at position: ", i
  44.             found = .TRUE.
  45.       end if
  46.       i = i +1;
  47.   end do
  48.  
  49. !Search for  a value  (ALL apparitions)
  50.    i = 1;
  51.   do while (i<=SIZE)
  52.       if (array(i)== valueToSearch) then
  53.             print *," (All) Found value at position: ", i
  54.       end if
  55.       i = i +1;
  56.   end do
  57.  
  58.  
  59. !Search for a value  (last apparition)
  60.    i = SIZE;
  61.    found = .FALSE.;
  62.    valueToSearch = 3;
  63.   do while (i>=1 .AND. .not. found)
  64.       if (array(i)== valueToSearch) then
  65.             print *,"(Last) Found value at position: ", i
  66.             found = .TRUE.
  67.       end if
  68.       i = i -1;
  69.   end do
  70.  
  71.  
  72. !Adding up values
  73.   sum = 0;
  74.    DO i = 1, SIZE
  75.    sum=sum + array(i);
  76.   END DO
  77.  
  78.   print *,"The sum of values is ", sum
  79.  
  80.  
  81. !Adding up values with a filter
  82.     sum = 0;
  83.    DO i = 1, SIZE
  84.     if (array(i)>3) then
  85.             print *,"Found value at position: ", i
  86.              sum=sum + array(i);
  87.       end if
  88.   END DO
  89.  
  90.  
  91.  !Find the max value and use of the intrinsic function MAXVAL
  92.   maxValue = array(1)
  93.   DO i = 2, SIZE
  94.     if (array(i)>maxValue) then
  95.             maxValue = array(i);
  96.       end if
  97.   END DO
  98.  
  99.  print *,"The max  value is ", maxValue,  MAXVAL(array)
  100.  
  101. !Find the min value  and use of the intrinsic function MINVAL
  102.    minValue = array(1)
  103.   DO i = 2, SIZE
  104.     if (array(i)<minValue) then
  105.             minValue = array(i);
  106.       end if
  107.   END DO
  108.  
  109.  print *,"The min  value is ", minValue, minval(array)
  110.  
  111.  
  112.  
  113.   read *,
  114.  
  115. end program arrays

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