Comparison of C/C++ and FreeBASIC



C/C++
FreeBASIC



variable declaration
int a;
int a, b, c;
dim a as integer
dim as integer a, b, c



uninitialized variable
int a;
dim a as integer = any


zero-initialized variable
int a = 0;
dim a as integer


initialized variable
int a = 123;
dim a as integer = 123


array
int a[4];
a[0] = 1;
dim a(0 to 3) as integer
a(0) = 1



pointer
int a;
int *p;
p = &a;
*p = 123;
dim a as integer
dim p as integer ptr
p = @a
*p = 123





structure, user-defined type
struct UDT {
int myfield;
}
type UDT
myfield as integer
end type




typedef, type alias
typedef int myint;
type myint as integer


struct pointer
struct UDT x;
struct UDT *p;
p = &x;
p->myfield = 123;
dim x as UDT
dim p as UDT ptr
p = @x
p->myfield = 123





function declaration
int foo( void );
declare function foo( ) as integer


function body
int foo( void ) {
return 123;
}
function foo( ) as integer
return 123
end function




sub declaration
void foo( void );
declare sub foo( )


sub body
void foo( void ) {
}
sub foo( )
end sub



byval parameters
void foo( int param );
foo( a );
declare sub foo( byval param as integer )
foo( a );



byref parameters
void foo( int *param );
foo( &a );

void foo( int& param );
foo( a );
declare sub foo( byref param as integer )
foo( a )










statement separator
;

:
<end-of-line>



for loop
for (int i = 0; i < 10; i++) {
...
}
for i as integer = 0 to 9
...
next




while loop
while (condition) {
...
}
while condition
...
wend




do-while loop
do {
...
} while (condition);
do
...
loop while condition




if block
if (condition) {
...
} else if (condition) {
...
} else {
...
}
if condition then
...
elseif condition then
...
else
...
end if








switch, select
switch (a) {
case 1:
...
break;
case 2:
case 3:
...
break;
default:
...
break;
}
select case a
case 1
...


case 2, 3
...

case else
...

end select













string literals, zstrings
char *s = "Hello!";
char s[] = "Hello!";
dim s as zstring ptr = @"Hello!"
dim s as zstring * 6+1 = "Hello!"



hello world
#include <stdio.h>
int main() {
printf("Hello!\n");
return 0;
}
print "Hello!"










comments
// foo
/* foo */
' foo
/' foo '/



compile-time checks
#if a
#elif b
#else
#endif
#if a
#elseif b
#else
#endif





compile-time target system checks
#ifdef _WIN32
#ifdef __FB_WIN32__


module/header file names
foo.c, foo.h
foo.bas, foo.bi


typical compiler command to create an executable
gcc foo.c -o foo
fbc foo.bas



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