COMPLEX(X, Y) returns a complex number where X is converted to the real component and Y is converted to the imaginary component.
GNU extension
Elemental function
RESULT = COMPLEX(X, Y)
| X | The type may be INTEGER or REAL. |
| Y | The type may be INTEGER or REAL. |
If X and Y are both of INTEGER type, then the return value is of default COMPLEX type.
If X and Y are of REAL type, or one is of REAL type and one is of INTEGER type, then the return value is of COMPLEX type with a kind equal to that of the REAL argument with the highest precision.
program test_complex
integer :: i = 42
real :: x = 3.14
print *, complex(i, x)
end program test_complex
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gfortran/COMPLEX.html