CODE:

#include 

int main(void) {
	int a,b,c;
	a=b=10;
	c=a+++b;
	printf("c=a+++b\n");
	printf("a=%d,b=%d,c=%d\n",a,b,c);
	a=b=10;
	c=a---b;
	printf("c=a---b\n");
	printf("a=%d,b=%d,c=%d\n",a,b,c);
	a=b=10;
	/*c=a+++++b;はエラー*/ 
	c=a+++--b;
	printf("c=a+++--b\n");
	printf("a=%d,b=%d,c=%d\n",a,b,c);
	a=b=10;
	/*c=a-----b;はエラー*/ 
	c=a---++b;
	printf("c=a---++b\n");
	printf("a=%d,b=%d,c=%d\n",a,b,c);
	return 0;
}