Instructions

175 C-Control Pro IDE

Floating Point Figures (data type float) may contain a decimal point and an exponent.

float x,y;

x=5.70;

y=2.3e+2;

x=-5.33e-1;

sizeof Operator

By the operator sizeof() the number of Bytes a variable takes up in memory can be determined.

Examples:

int s;

float f:

s=sizeof(f); // the value of s is 4

With arrays only the Byte length of the basic data type is returned. On order to calculate the

memory consumption of the array the value must be multiplied by the number of elements.

Array Variables

If behind the name, which in case of a variable definition is set in brackets, a figure value is written

then an array has been defined. An array will arrange the space for a defined variable manifold in

memory. With the following example definition

int x[10];

a tenfold memory space has been arranged for variable x. The first memory space can be addressed

by X[0], the second by x[1], the third by x[2], … up to x[9]. When defining of course other index

dimensions can also be chosen. The memory space of C-Control Pro is the only limit.

Multi dimensional arrays can also be declared by attaching further brackets during variable definition:

int x[3][4]; // array with 3*4 entries

int y[2][2][2]; // array with 2*2*2 entries

Arrays may in CompactC have up to 16 indices (dimensions). The maximum value for an index

is 65535. The indices of arrays are in any case zero based, i .e. each index will start with a 0.

Only if the compiler option "Check Array Index Limits" is set, there will be a verification whether

or not the defined index limits of an array have been exceeded. Otherwise, if an index becomes too

large during program execution the access to alien variables will be tried which in turn may create a

good chance for a program breakdown.

Table support by predefined Arrays

Since version 2.0 of the IDE arrays can be predefined with values: