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void printbits(unsigned int x){
	int i;
	int mask = 0x1;
 
	for(i = 15; i >= 0; i--){
		printf("%d", (x >> i) & mask);
		if((i % 4) == 0) putchar(' ');
	}
	putchar('\n');
}
 
unsigned rightrot(unsigned x, unsigned char n){
	__asm{
		mov ebx, x
		mov cl, n
		ror ebx, cl
		mov x, ebx
	};
	return x;
}
 
int main(){
	unsigned x = 0x40;
 
	printbits(x);
	x = rightrot(x, 4);
	printbits(x);
 
	scanf("%d", &x);
	return 0;
}

prog.c: In function 'printbits':
prog.c:6:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   printf("%d", (x >> i) & mask);
   ^
prog.c:6:3: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:6:3: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:7:20: warning: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
   if((i % 4) == 0) putchar(' ');
                    ^
prog.c: In function 'rightrot':
prog.c:13:7: error: expected '(' before '{' token
  __asm{
       ^
prog.c:14:3: error: unknown type name 'mov'
   mov ebx, x
   ^
prog.c:15:3: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'mov'
   mov cl, n
   ^
prog.c:14:7: warning: unused variable 'ebx' [-Wunused-variable]
   mov ebx, x
       ^
prog.c:22:5: warning: 'main' is normally a non-static function [-Wmain]
 int main(){
     ^
prog.c: In function 'main':
prog.c:29:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d", &x);
  ^
prog.c:29:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:29:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c: In function 'rightrot':
prog.c:31:1: error: expected declaration or statement at end of input
 }
 ^

Standard output is empty