Description: Function ReadDat () to read from a file ENG.IN an article in English, into the string array in xx Prepare function encryptChar (), according to the given array of alternative relations xx replace all the characters, xx still deposit the corresponding array position, and finally call the function WriteDat () output the results to a file PS2.DAT in xx. Alternative relations: f (p) = p* 13 mod 256 (p is the array one character ASCII value, f (p) is the calculated value of the new ASCII characters), if the calculated f (p) value less than or equal or the ASCII value of 32 is even, then the character unchanged, otherwise f (p) replaced by the corresponding characters.
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5.c
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