Visual C ++错误C2143：语法错误：在'常量'之前缺少'）'

Question

I'm getting an error in Visual C++ that is giving me a really hard time.

The error is error c2143 reading: syntax error: missing ')' before 'constant'

My code line is:

coefficient[i] = (1 - (2 * depth)) + ((t - floor( t + 0.5 ) + 1 ) 2 * depth); 

I have #include at the beginning of the file which should define the floor(double) function.

a bit more explanation of the variables.

double depth is a member variable of the class which this line can be found in.
int i is an incrementing index value.
double t is an incrementing value.

What they do is really unimportant, but I wanted to clarify that all three are already defined as variables of basic types.

I've gone through and verified that all the parentheses match up. I'm kind of at a loss as to what 'constant' the compiler is referring to. Any ideas?

Answer 1

I'm not quite sure if this is the same error that the compiler is giving you, but you have to put a '*' sign in front of the second '2' so that this:

coefficient[i] = (1 - (2 * depth)) + ((t - floor( t + 0.5 ) + 1 ) 2 * depth);

Becomes this:

coefficient[i] = (1 - (2 * depth)) + ((t - floor( t + 0.5 ) + 1 ) * 2 * depth);

Answer 2

其他海报已经向您展示了声明中的实际错误，但是请将其拆分为多个子语句，以便更清楚地显示您尝试以数学方式进行的操作，因为如果您不这样做，该功能将在未来引起您的头痛“T！

Answer 3

coefficient[i] = (1 - (2 * depth)) + ((t - floor( t + 0.5 ) + 1 ) (the problem is here) 2 * depth);

Answer 4

Even though you have the right answer, I'm going to explain how you should have arrived at it.

When faced with an error in a long expression that you can't find, take the expression apart, piece by piece, until you find it.

In this case:

coefficient[i] = (1 - (2 * depth)) + ((t - floor( t + 0.5 ) + 1 ) 2 * depth);

becomes:

firsthalf = (1 - (2 * depth));
secondhalf = ((t - floor( t + 0.5 ) + 1 ) 2 * depth);   // Error appears on this line
coefficient[i] = firsthalf + secondhalf;

This eliminates the first part as the source of the error.

Next attempt:

exprA = (t - floor( t + 0.5 ) + 1 );
exprB = exprA * 2;
exprC = exprB * depth;   // Hmm.... this all worked.  Start putting it back together.
secondhalf = exprC;

Final attempt:

exprA = (( MY_TEST_CONSTANT ) 2 * depth);   // Error now becomes obvious.

Answer 5

系数[i] =（1 - （2 *深度））+（（t - floor（t + 0.5）+ 1） 2（这里有2个做什么？） *深度）;

Answer 6

I faced a similar error when declaring an enum. It was because one of the enum constants was also declared elsewhere in the code.