【发布时间】：2018-12-24 15:12:40
【问题描述】：
我在编译代码时遇到两个“预期标识符”错误，即使它是根据 ANSI-C 标准编写的。 我使用带有标志 -Wall -ansi -pedantic 的 gcc 编译器进行编译。 我知道编译器很旧，但我的大学要求我使用它。
复制粘贴错误：
mycomp.c:202:5: error: expected identifier or ‘(’ before ‘return’
return SUCCESS;
^
mycomp.c:203:1: error: expected identifier or ‘(’ before ‘}’ token
}
^
makefile:10: recipe for target 'mycomp.o' failed
我尝试查看我的代码，但找不到任何语法问题。我尝试按照错误指南进行操作，例如，在“return”之前添加“(”或在“}”标记之前添加“(”，但这并没有改变任何内容，我仍然会收到这些错误。
代码又长又乱，但我只在最后得到一个错误，或者它：最后一个返回和最后一个 } 数字。
int main() {
char command[SIZE_OF_LINE];
int commandIndex; int i;
int numbers[2]; char var[2];
/* As requested, initializing all complex values to 0 + 0i */
read_comp(A, NONE, 0 ,0);
read_comp(B, NONE, 0 ,0);
read_comp(C, NONE, 0 ,0);
read_comp(D, NONE, 0 ,0);
read_comp(E, NONE, 0 ,0);
read_comp(F, NONE, 0 ,0);
commandIndex = 0;
numbers[0] = commandIndex;
numbers[1] = commandIndex;
var[0] = '0';
var[1] = '0';
for(i = 0; ; i = 0)
if(!fgets(command, SIZE_OF_LINE, stdin)) {
i = undefinedCharSkipper(command, i);
commandIndex = commandIdentifier(command, i);
if(cmd[commandIndex].func == NULL) {
fprintf(stderr, "Command does not exist:%s\n", command);
}
if(strcmp(cmd[commandIndex].name, "read_comp") == 0) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
i = undefinedCharSkipper(command, i);
if(numberReceiver(command, i) != FAIL) {
numbers[0] = numberReceiver(command, i);
}
i = undefinedCharSkipper(command, i);
if(numberReceiver(command, i) != FAIL) {
numbers[1] = numberReceiver(command, i);
}
/* Running command */
read_comp(getComplex(var[0]), NONE, numbers[0], numbers[1]);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "print_comp") == 0 ) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
/* Running command */
print_comp(getComplex(var[0]), NONE, 0, 0);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "add_comp") == 0 ) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[1] = letterReceiver(i);
}
/* Running command */
add_comp(getComplex(var[0]), getComplex(var[1]), 0, 0);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "sub_comp") == 0) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[1] = letterReceiver(i);
}
/* Running command */
sub_comp(getComplex(var[0]), getComplex(var[1]), 0, 0);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "mult_comp_real") == 0) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
i = undefinedCharSkipper(command, i);
if(numberReceiver(command, i) != FAIL) {
numbers[0] = numberReceiver(command, i);
}
/* Running command */
mult_comp_real(getComplex(var[0]), NONE, numbers[0], 0);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "mult_comp_img") == 0) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
i = undefinedCharSkipper(command, i);
if(numberReceiver(command, i) != FAIL) {
numbers[0] = numberReceiver(command, i);
}
/* Running command */
mult_comp_img(getComplex(var[0]), NONE, 0, numbers[0]);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "mult_comp_comp") == 0) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[1] = letterReceiver(i);
}
/* Running command */
mult_comp_comp(getComplex(var[0]), getComplex(var[1]), 0, 0);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "abs_comp") == 0) {
/* Recieving parameters and setting in place */
i = undefinedCharSkipper(command, i);
if(letterReceiver(i) != FAIL) {
var[0] = letterReceiver(i);
}
/* Running command */
abs_comp(getComplex(var[0]), NONE, 0, 0);
end(command, i);
}
if(strcmp(cmd[commandIndex].name, "stop") == 0) {
stop(NONE, NONE, 0, 0);
end(command, i);
}
}
else { /* Failed scanning the user's input */
printf("\n");
printf("Scanning had failed");
printf("\n");
}
}
return SUCCESS;
}
预期结果：编译没有错误，因为这是我得到的唯一 2 个错误。 实际结果：出现 2 个错误。
【问题讨论】：
-
您应该避免在编译器告诉您其他情况时声称您的代码是正确的。奥卡姆剃刀原则适用于这些情况。
-
建议：一旦你匹配了一个字符串到
cmd[commandIndex].name，所有后续的测试都可以省略。您可以使用else if而不是if来做到这一点。 -
请提供一个最少个可验证的例子。你可以这样做。 G。一个接一个地删除
if块。向我们展示大量不相关的代码并不能真正帮助任何人。这样做可能会使问题变得明显。 -
@Gerhardh 问题已经解决，但非常感谢您尝试帮助我！