摘要： /*计算和，差，商，积*/#includeint main(void){ double num1,num2; char op; printf("Type in an expression:"); scanf("%lf%c%lf",&num1,&op,&num2); switch(op){ case'+': printf("=%.2f\n",num1+num2); break; case'-': printf("=%.2f\n",num1-num2); brea 阅读全文