C语言 “未定义对 clrscr() 的引用；”
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"UNDEFINED REFRENCE TO clrscr();"
提问by Samuel
#include<stdio.h>
#include<conio.h>
void main()
{
int i=1,a,b,c,choice;
do
{
printf("enter any two numbers\n");
scanf("%d%d",&a,&b);
printf("pressing one add the two numbers\nenter one if you want to\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
{
c=a+b;
printf("the sum of the entered numbers%.1f\n\n:",c);
break;
}
default:
printf("you have entered an invalid");
break;
}
clrscr();
}
while(i==1);
getch();
}
i do not know cause my classmate is using turbo c and it's fine,for me i am using dev c++ but looks like clrscr(); is not known to the compiler help please.
我不知道因为我的同学正在使用 turbo c，这很好，对我来说我使用的是 dev c++，但看起来像 clrscr()；不知道编译器帮助。
回答by Ferenc Deak
Your classmate is programming under DOS, obviously you don't ... conio.hcomes with Turbo C and DOS ... So, remove the lines
你的同学在DOS下编程，显然你没有......conio.h带有Turbo C和DOS......所以，删除这些行
#include<conio.h>
and
和
clrscr();
and
和
getch();
to make your program compile ...
使您的程序编译...
... and do not use %.1fto print an int.
... 并且不要%.1f用于打印 int。
... and main()must return int
...并且main()必须返回int
* and do not copy from your classmate ... he seems to be stuck in the stone age*
*不要抄袭你的同学...他似乎被困在石器时代*
回答by Sadique
From Wiki:
来自维基：
conio.h is a C header file used mostly by MS-DOS compilers to provide console input/output.1It is not part of the C standard library, ISO C nor is it defined by POSIX
Member functions
kbhit - Determines if a keyboard key was pressed. getch - Reads a character directly from the console without buffer, and without echo. getche - Reads a character directly from the console without buffer, but with echo. ungetch - Puts the character c back into the keyboard buffers. cgets - Reads a string directly from the console. cscanf - Reads formatted values directly from the console. putch - Writes a character directly to the console. cputs - Writes a string directly to the console. cprintf - Formats values and writes them directly to the console. clrscr - Clears the screen.Compilers provided later than 1989 have prepended an _ to the names, to comply with the requisites of the ANSI C Standard.
conio.h 是一个 C 头文件，主要由 MS-DOS 编译器用来提供控制台输入/输出。1它不是 C 标准库、ISO C 的一部分，也不是由 POSIX 定义的
成员函数
kbhit - Determines if a keyboard key was pressed. getch - Reads a character directly from the console without buffer, and without echo. getche - Reads a character directly from the console without buffer, but with echo. ungetch - Puts the character c back into the keyboard buffers. cgets - Reads a string directly from the console. cscanf - Reads formatted values directly from the console. putch - Writes a character directly to the console. cputs - Writes a string directly to the console. cprintf - Formats values and writes them directly to the console. clrscr - Clears the screen.1989 年以后提供的编译器在名称前加了一个 _，以符合 ANSI C 标准的要求。
conio.his not part of the C standard. It is a Borland extension, and works only with Borland compilers (and perhaps some other commercial compilers). Dev-C++ uses GCC, the GNU Compiler Collection, as it's compiler. GCC is originally a UNIX compiler, and aims for portability and standards-compliance.
conio.h不是 C 标准的一部分。它是 Borland 扩展，仅适用于 Borland 编译器（可能还有一些其他商业编译器）。Dev-C++ 使用 GCC，即 GNU 编译器集合，因为它是编译器。GCC 最初是一个 UNIX 编译器，旨在实现可移植性和符合标准。
You can use Borland functions this way in Dev C++: Include conio.h to your source, and add C:\Dev-C++\Lib\conio.o to "Linker Options" in Project Options (where C:\Dev-C++ is where you installed Dev-C++).
您可以在 Dev C++ 中以这种方式使用 Borland 函数：将 conio.h 添加到您的源代码中，并将 C:\Dev-C++\Lib\conio.o 添加到项目选项中的“链接器选项”（其中 C:\Dev-C++ 是安装 Dev-C++ 的地方）。
