写出以下的执行结果(________) int p1,m1,n1,dv,df; char *p= "a+b-c+d/e",c; p1=m1=n1=dv=df=0; while (( c=*p++)!= ‘\0’) { switch (c) { case ‘+’:p1++;break; case ‘-’:m1++;break; case ‘*’:n1++;break; case ‘/’:dv++;break; default:df++; } } printf("%d,%d,%d,%d\n",p1,m1,dv,df);