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String reading and writing functions fgets and fputs
1. Reading string function The function of fgets function is to read a string from the specified file into a character array. The function call is in the form: fgets (character array name, n, file pointer ); where n is a positive integer. Indicates that the string read from the file does not exceed n-1 characters. Add the end-of-string mark ' after the last character read

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