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This section describes the following functions, macros and external variables:

• perror - Output error message
• pow, powf, powl - General exponential function
• printf - Formatted output on standard output
• putc - Write a character to a file
• putchar - Write a character to the standard output
• putenv - change or add environment variables
• puts - Output a string to the standard output
• putw - Write a word at a time into a file
• putwc - Write wide character to a file
• putwchar - Write wide character to standard output