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 Section All Sections 1 - General Commands 2 - System Calls 3 - Subroutines 4 - Special Files 5 - File Formats 6 - Games 7 - Macros and Conventions 8 - Maintenance Commands 9 - Kernel Interface n - New Commands
 abort(3) -- cause abnormal program termination The abort() function causes abnormal program termination unless the signal SIGABRT is caught and the signal handler does not return. If the abort() function causes program termination, all open stream... abs(3) -- compute the absolute value of an integer. The abs() function computes the absolute value of the integer argument j. The labs(), llabs() and imaxabs() functions compute the absolute value of the argument j of the appropriate integer type for t...
acos(3) -- arc cosine function
The acos() function calculates the arc cosine of x; that is the value whose cosine is x. If x falls outside the range -1 to 1, acos() fails and errno is set.
acosh(3) -- inverse hyperbolic cosine function
The acosh() function calculates the inverse hyperbolic cosine of x; that is the value whose hyperbolic cosine is x. If x is less than 1.0, acosh() returns not-a-number (NaN) and errno is set.
alloca(3) -- memory allocator
The alloca function allocates size bytes of space in the stack frame of the caller. This temporary space is automatically freed on return.
asin(3) -- arc sine function
The asin() function calculates the arc sine of x; that is the value whose sine is x. If x falls outside the range -1 to 1, asin() fails and errno is set.
asinh(3) -- inverse hyperbolic sine function
The asinh() function calculates the inverse hyperbolic sine of x; that is the value whose hyperbolic sine is x.
assert(3) -- Abort the program if assertion is false.
assert() prints an error message to standard output and terminates the program by calling abort() if expression is false (i.e., compares equal to zero). This only happens when the macro NDEBUG was und...
atan(3) -- arc tangent function
The atan() function calculates the arc tangent of x; that is the value whose tangent is x.
atan2(3) -- arc tangent function of two variables
The atan2() function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the q...
atanh(3) -- inverse hyperbolic tangent function
The atanh() function calculates the inverse hyperbolic tangent of x; that is the value whose hyperbolic tangent is x. If the absolute value of x is greater than 1.0, acosh() returns not-a-number (NaN)...
atexit(3) -- register a function to be called at normal program termination.
The atexit() function registers the given function to be called at normal program termination, whether via exit(3) or via return from the program's main. Functions so registered are called in the rev...
atof(3) -- convert a string to a double.
The atof() function converts the initial portion of the string pointed to by nptr to double. The behaviour is the same as strtod(nptr, (char **)NULL); except that atof() does not detect errors.
atoi(3) -- convert a string to an integer.
The atoi() function converts the initial portion of the string pointed to by nptr to int. The behaviour is the same as strtol(nptr, (char **)NULL, 10); except that atoi() does not detect errors. The a...
barchart(3) -- Bar chart for plotting X-Y coordinate data.
The barchart command creates a bar chart for plotting two-dimensional data (X-Y coordinates). A bar chart is a graphic means of comparing numbers by displaying bars of lengths proportional to the y-co...
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