摘要：
#includeint main(void){ double valuel,value2; char op; printf("Type in an expression:"); scanf("%lf%c%lf",&valuel,&op,&value2); if(op=='+') printf("=%.2f\n",valuel+value2); else if(op=='-') printf("=%.2f\n",valuel-value2); else if(o 阅读全文
