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void fortran_style(var1,var2,var3) float var2; {
	printf("var1 = %d,\nvar2 = %.2f,\nvar3 = %d\n",var1,var2,var3);
}
 
float multiple_arguments(){return 0.5f;}
 
const int extern_const_int;
 
typedef enum { 
	and,and_eq,alignas,alignof,bitand,bitor,bool,catch,char16_t,char32_t,class,
	compl,constexpr,const_cast,decltype,delete,dynamic_cast,explicit,export,
	false,friend,mutable,namespace,new,noexcept,not,not_eq,nullptr,operator,or,
	or_eq,private,protected,public,reinterpret_cast,static_assert,static_cast,
	template,this,thread_local,throw,true,try,typeid,typename,using,virtual,
	wchar_t,xor,xor_eq
} keywords;
 
typedef struct {
	int size;
	int data[];
} variable_sized_struct;
 
implicit_int = 4;
 
main(){
	volatile int dynamic_val = 55;
	int variable_length_array[dynamic_val];
	auto float scoped_variable = multiple_arguments(implicit_int,implicit_int,implicit_int,implicit_int);
	keywords int_to_enum = 5;
	fortran_style(implicit_int,scoped_variable,int_to_enum);
	void *void_ptr = malloc(sizeof(variable_sized_struct)+sizeof(int[dynamic_val]));
	variable_sized_struct *vssptr;
	vssptr = void_ptr;
	free(void_ptr);
	return 0;
}
 

prog.c: In function ‘fortran_style’:
prog.c:2: warning: implicit declaration of function ‘printf’
prog.c:2: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c: At top level:
prog.c:23: warning: data definition has no type or storage class
prog.c:23: warning: type defaults to ‘int’ in declaration of ‘implicit_int’
prog.c:25: warning: return type defaults to ‘int’
prog.c: In function ‘main’:
prog.c:31: warning: implicit declaration of function ‘malloc’
prog.c:31: warning: incompatible implicit declaration of built-in function ‘malloc’
prog.c:34: warning: implicit declaration of function ‘free’
prog.c:34: warning: incompatible implicit declaration of built-in function ‘free’
prog.c:27: warning: unused variable ‘variable_length_array’

var1 = 4,
var2 = 0.50,
var3 = 5