在dev-c中内嵌汇编代码

#include
int main(){
int a,b;
a=3;
b=9;

asm("movl $4,%eax"\
"movl %eax,a");

    printf("%d",a);

}

a的值没变，而且提示bad register name '%eaxmovl %eax'

movl改为mov a, b改成全局变量， asm
例：

#include<cstdio>
int a, b;
int main(){
a = 3;
b = 6;
asm("mov $4,%eax");
asm("mov %eax,a");
printf("%d",a);
}