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

• ecvt - Convert a floating-point number to a string
• _edt - EDT call
• environ - external variable for environment
• erf, erff, erfl - Error function (mathematical)
• erfc, erfcf, erfcl - Complement of error function (mathematical)
• exit, _exit, _Exit - Program termination
• exp, expf, expl - Exponential function
• expm1, expm1f, expm1l - Exponential function
• exp2, exp2f, exp2l - Exponential function