Command ^{1)} 
Explanation & Details 
abs(x: real): real; 
Finds the absolute value of x, which can be real or integer. The result is the same type as x. 
cos(x: real): real; 
Finds the cosine of x which can be real or integer. x is expressed in radians. The result is always real. 
dec(var x: integer); 
Decrements the value of x by one. 
exp(var x: real): real; 
Returns the result of the exponentional function e^{x}. 
high(x: array of...):integer; 
Returns the upper index limit of the array x.

inc(var x: integer); 
Increments the value of x by one. 
IsNaN(var x: double): boolean; 
Returns TRUE if the parameter x is not a number (NaN). 
int(x: real): real; 
Returns the nearest integer below the given real x. No conversion is performed (in contrast to the function trunc). 
length(x: string/dynamic array): integer; 
Returns the number of characters in a string or the number of elements in an array x. 
ln(var x: real): real; 
Returns the natural logarithm of x. 
low(x: array of...):integer; 
Returns the lower index limit of the array x.

nrand(stddev: real): real; 
Returns a normally distributed random number exhibiting a zero mean and a standard deviation specified by the parameter stddev.

pi 
Returns the value of Pi (= 3.14159265....) 
power(base, expo: real): real 
calculates the power function: result = base^{expo} 
rand(amplitude: real): real; 
Returns a uniformly distributed random number in the range between amplitude/2 and +amplitude/2. The mean of the random number is zero. In order to create integer random numbers from 1 to N, please use the following formula: round(rand(N)+N/2+0.5) 
round(x: real): integer; 
Finds the nearest integer to the given real x. 
sin(x: real): real; 
Finds the sine of x, which can be real or integer. x is expressed in radians. The result is always real.

sqr(x: real):real; 
Finds the square of x, which can be real or integer. The result is always real.

sqrt(x: real): real; 
Finds the square root of x, which can be real or integer. The result is always real. Example: sqrt(myvar) 
trunc(x: real): integer; 
Finds the nearest integer below the given real x (converts a real to an integer).
