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superstat54木蟲 (小有名氣)
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[求助]
Fortran 怎么把字符串轉(zhuǎn)換為表達(dá)式
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| 比如從文件中讀入這樣一串字符 "100 + x*x"復(fù)制給a,"sin(x)"賦值給b,如果程序中x=0.5,怎么在程序中把這一串字符"a + b"轉(zhuǎn)換為表達(dá)式100 + x*x + sin(x) ,并求出其值? |
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木蟲 (小有名氣)
木蟲 (著名寫手)
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The USE statement has the syntax USE environment-name,filename where filename is optional, and is a character-valued expression. It causes the text of the named environment to be, in effect, placed in the program at the point where the USE statement was encountered, and the programs whose object code is in the environment to be callable from the program in which the USE statement is found, as well as (less usefully) from any other programs loaded into memory at the same time. In some implementations, because ENVIRONMENTs are incompatible with the available linkage loading mechanisms, the filename may be compulsory the first time a USE statement referring to environments in a given file is encountered, but not in subroutines, even externally compiled subroutines, later in the source stream. |

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