当我使用bcc编译我的.c文件时，我得到一个错误的表达式错误（如下所示），我不知道是什么导致它。
在main中，以下行导致......
char test[13312];
......这个错误
kernel.c:25.5: error: bad expression
kernel.c:25.10: error: need ';'
注释掉该行（以及使用测试数组的行）会使错误消失。
这是所有代码：
/* kernel
*
* Register parameters for various BIOS interrupts
* http://www.ctyme.com/intr/int.htm
*
* Sector 1: Map
* Sector 2: Dir
* Sector 3: Kernel
*/
void printString(char* chars);
void readString(char* arr);
void readSector(char* buffer, int sector);
void readFile(char* fileName, char* buffer);
void handleInterrupt21(int ax, int bx, int cx, int dx);
int mod(int a, int b);
int div(int a, int b);
void main(){
printString("helloooo from main");
//char line[80];
//char buffer[80];
char test[13312];
makeInterrupt21();
interrupt(0x21,0,"test",0,0);
//interrupt(0x21,3,"messag",buffer,0);
//interrupt(0x21,3,"helloo",line,0);
//interrupt(0x21,0,"hello from main",0,0);
readFile("messag",test);
interrupt(0x21,0,test,0,0);
//interrupt(0x21,0,line,0,0);
while(1);
}
// Prints out each character of the array until it reaches 0x0
// Call using Int 21 w/ ax=0
void printString(char* chars){
int i=0;
for(i=0;chars[i]!='\0';i++){
char al = chars[i];
char ah = 0xe;
int ax = ah * 256 + al;
interrupt(0x10, ax, 0, 0, 0);
}
}
// Reads from keyboard, while updating the display with what is being typed
// Can deal with backspaces
// Call using Int 21 w/ ax=1
void readString(char* arr){
char enter = 0xd;
char endLine = 0xa;
char nullChar = 0x0;
char back = 0x8;
// while loop set up
int i = 0;
char ascii = interrupt(0x16, 0, 0, 0, 0);
interrupt(0x10, 0xe*256+ascii, 0, 0, 0);
// exit key: enter
while(ascii!=enter){
// decrements i (up to 0) if a backspace is entered, otherwise increments i
// deals with what is in the char array
if(ascii==back&&i>0) {i--;}
else if(ascii==back) {i=0;}
else {arr[i]=ascii; i++;}
// get next input letter and write it to screen
ascii = interrupt(0x16, 0, 0, 0, 0);
interrupt(0x10, 0xe*256+ascii, 0, 0, 0);
// clear the display when backspace is clicked
if(ascii==back){
interrupt(0x10, 0xe*256+nullChar, 0, 0, 0);
interrupt(0x10, 0xe*256+ascii, 0, 0, 0);
}
}
// puts end line and null characters at the end of the array
arr[i] = endLine;
arr[i+1] = nullChar;
// Writes a new line character to the screen
interrupt(0x10, 0xe*256+endLine, 0, 0, 0);
}
// Will take a predefined character array of 512 bytes+, and a sector number
// Call using Int 21 w/ ax=2
void readSector(char* buffer, int sector){
int ah = 2; // tells BIOS to read
int al = 1; // number of sectors to read
int ax = ah * 256 + al;
int bx = buffer; // address where the data should be stored to
int ch = div(sector,36); //0 // track number
int cl = mod(sector,18)+1; //13; // relative sector number
int cx = ch * 256 + cl;
int dh = mod(div(sector,18),2); //1; // head number
int dl = 0; // device number; 0=floppy
int dx = dh * 256 + dl;
//printString(bx);
interrupt(0x13, ax, bx, cx, dx);
//printString((char)buffer);
}
// Call using Int 21 w/ ax=3
// Not a finished
void readFile(char* fileName, char* buffer){
printString("entered");
char dir[512];
readSector(dir,2);
// p will always be first char of what we're looking at
int i,j,p;
i = j = p
int flag= 0;
while(i<16){
printString("i-loop");
j=p;
while(j<6){
printString("j-loop");
if(!dir[j]==fileName[j-p])
break;
j++;
}
if(j==5) {flag=1; printString("flag=1"); break;}
p+=32;
i++;
}
if(flag==0){
printString("0");
} else {
printString("1");
}
buffer = flag;
}
void handleInterrupt21(int ax, int bx, int cx, int dx){
if(ax==0) {
// bx = String
printString(bx);
} else if(ax==1) {
// bx = buffer to hold read string
readString(bx);
} else if(ax==2) {
// bx = buffer to hold read string
// cx = sector number
readSector(bx,cx);
} else if(ax==3) {
// bx = char array holding file name
// cx = address of a buffer to hold the file
readFile(bx,cx);
} else {
printString("Invalid use of Int 21\0");
}
}
// aka a%b
int mod(int a, int b){
while(a>=b)
a=a-b;
return a;
}
// aka a/b
int div(int a, int b){
int q = 0;
while (a>=b){
q++;
a=a-b;
}
return q;
}
更新 修复声明错误仍会导致编译错误（仅在bcc中）。似乎编译器不喜欢任何变量声明。
/* kernel
*
* Register parameters for various BIOS interrupts
* http://www.ctyme.com/intr/int.htm
*
* Sector 1: Map
* Sector 2: Dir
* Sector 3: Kernel
*/
void printString(char* chars);
void readString(char* arr);
void readSector(char* buffer, int sector);
void readFile(char* fileName, char* buffer);
void handleInterrupt21(int ax, int bx, int cx, int dx);
int mod(int a, int b);
int div(int a, int b);
void main(){
//char line[80];
//char buffer[80];
char test[13312];
makeInterrupt21();
interrupt(0x21,0,"test",0,0);
//interrupt(0x21,3,"messag",buffer,0);
//interrupt(0x21,3,"helloo",line,0);
//interrupt(0x21,0,"hello from main",0,0);
readFile("messag",test);
interrupt(0x21,0,test,0,0);
//interrupt(0x21,0,line,0,0);
while(1);
}
// Prints out each character of the array until it reaches 0x0
// Call using Int 21 w/ ax=0
void printString(char* chars){
int i=0;
for(i=0;chars[i]!='\0';i++){
char al = chars[i];
char ah = 0xe;
int ax = ah * 256 + al;
interrupt(0x10, ax, 0, 0, 0);
}
}
// Reads from keyboard, while updating the display with what is being typed
// Can deal with backspaces
// Call using Int 21 w/ ax=1
void readString(char* arr){
char enter = 0xd;
char endLine = 0xa;
char nullChar = 0x0;
char back = 0x8;
// while loop set up
int i = 0;
char ascii = interrupt(0x16, 0, 0, 0, 0);
interrupt(0x10, 0xe*256+ascii, 0, 0, 0);
// exit key: enter
while(ascii!=enter){
// decrements i (up to 0) if a backspace is entered, otherwise increments i
// deals with what is in the char array
if(ascii==back&&i>0) {i--;}
else if(ascii==back) {i=0;}
else {arr[i]=ascii; i++;}
// get next input letter and write it to screen
ascii = interrupt(0x16, 0, 0, 0, 0);
interrupt(0x10, 0xe*256+ascii, 0, 0, 0);
// clear the display when backspace is clicked
if(ascii==back){
interrupt(0x10, 0xe*256+nullChar, 0, 0, 0);
interrupt(0x10, 0xe*256+ascii, 0, 0, 0);
}
}
// puts end line and null characters at the end of the array
arr[i] = endLine;
arr[i+1] = nullChar;
// Writes a new line character to the screen
interrupt(0x10, 0xe*256+endLine, 0, 0, 0);
}
// Will take a predefined character array of 512 bytes+, and a sector number
// Call using Int 21 w/ ax=2
void readSector(char* buffer, int sector){
int ah = 2; // tells BIOS to read
int al = 1; // number of sectors to read
int ax = ah * 256 + al;
int bx = buffer; // address where the data should be stored to
int ch = div(sector,36); //0 // track number
int cl = mod(sector,18)+1; //13; // relative sector number
int cx = ch * 256 + cl;
int dh = mod(div(sector,18),2); //1; // head number
int dl = 0; // device number; 0=floppy
int dx = dh * 256 + dl;
//printString(bx);
interrupt(0x13, ax, bx, cx, dx);
//printString((char)buffer);
}
// Call using Int 21 w/ ax=3
// Not finished
void readFile(char* fileName, char* buffer){
printString("entered");
char dir[512];
readSector(dir,2);
// p will always be first char of what we're looking at
int i,j,p;
i = j = p = 0;
while(i<16){
printString("i-loop");
j=p;
while(j<6){
printString("j-loop");
if(!dir[j]==fileName[j-p])
break;
j++;
}
if(j==5) {flag=1; printString("flag=1"); break;}
p+=32;
i++;
}
if(flag==0){
printString("0");
} else {
printString("1");
}
buffer = flag;
}
void handleInterrupt21(int ax, int bx, int cx, int dx){
if(ax==0) {
// bx = String
printString(bx);
} else if(ax==1) {
// bx = buffer to hold read string
readString(bx);
} else if(ax==2) {
// bx = buffer to hold read string
// cx = sector number
readSector(bx,cx);
} else if(ax==3) {
// bx = char array holding file name
// cx = address of a buffer to hold the file
readFile(bx,cx);
} else {
printString("Invalid use of Int 21\0");
}
}
// aka a%b
int mod(int a, int b){
while(a>=b)
a=a-b;
return a;
}
// aka a/b
int div(int a, int b){
int q = 0;
while (a>=b){
q++;
a=a-b;
}
return q;
}
错误：
kernel.c:119.6: error: bad expression
kernel.c:119.10: error: need ';'
kernel.c:119.11: error: dir undeclared
kernel.c:119.15: error: illegal indirection
kernel.c:122.5: error: bad expression
kernel.c:122.7: error: need ';'
kernel.c:122.8: error: i undeclared
kernel.c:122.10: error: j undeclared
kernel.c:122.12: error: p undeclared
kernel.c:129.14: error: illegal indirection
kernel.c:133.18: error: flag undeclared
答案 0 :(得分：1)
有很多关于将指针赋给指针的事情的警告;但唯一的编译错误是您在;之后遗漏了i = j = p。
test或附近的声明没有任何错误。
答案 1 :(得分：0)
只是在黑暗中拍摄，但你是否在8位size_t的机器上？如果是，13312将因溢出而导致0。所以实际上，你有：
char test[0];
这将解释错误。请显示输出：
printf("%u\n", (unsigned)sizeof(size_t));