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

• raise - Send signal to own program
• rand - Random number generator
• read - Read from a file (elementary)
• realloc - Alter memory space
• remove - Delete file
• rename - Rename file
• rewind - Position read/write pointer to beginning of file
• rindex - Last occurrence of a character in a string
• rint, rintf, rintl - Round off to nearest whole number
• round, roundf, roundl - Round off to nearest whole number