c - 为什么在用 C 计算算术时会出现此编译错误？错误 C2143 在键入之前缺少 ':'

Question

在以下代码中，Visual Studio 给出了此错误:错误 C2143:语法错误:缺少 ';'在“输入”之前。
我不太确定为什么。我是C语言新手。

double areac1 = L1*W1;      //area of ceiling in first room
double areatotalc1 = L1*W1*2; //area of ceiling in first room to be painted

double gallonsexactc1 = areatotalc/ 350;    //area covered by one gallon in first room
double gallonsboughtc1 = ceil(gallonsexactc1);  //number of gallons bought for first room 

double costpaintc1 = gallonsboughtc1*27.98;     //cost to paint the ceiling in first room

Answer 1

假设您在代码中使用之前已经定义了 L1 和 W1。如果您替换，您的代码将正常工作

double gallonsexactc1 = areatotalc/ 350;

与

double gallonsexactc1 = areatotalc1/ 350;

因为您尚未定义areatotalc其areatotalc1