CHAR(I [, KIND]) returns the character represented by the integer I. 
Fortran 77 and later
Elemental function
RESULT = CHAR(I [, KIND]) 
| I | The type shall be INTEGER. | 
| KIND | (Optional) An INTEGERinitialization expression indicating the kind parameter of the result. | 
The return value is of type CHARACTER(1) 
program test_char
    integer :: i = 74
    character(1) :: c
    c = char(i)
    print *, i, c ! returns 'J'
end program test_char
| Name | Argument | Return type | Standard | 
| CHAR(I) | INTEGER I | CHARACTER(LEN=1) | Fortran 77 and later | 
See ICHAR for a discussion of converting between numerical values and formatted string representations.
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    https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/CHAR.html