我写了一个简单的程序，输入字母，输出相应的Ascii码，或输入Ascii码，输出相应的字母。编译正确
运行时，当我选1，然后回车，系统就把我输的回车当作是b了好像.请大家帮我纠正一下，谢谢诶
main()
{ int a,i;
char b;
printf("1:letter into Ascii number.\n");
printf("2:Ascii number into letter.\n");
scanf("%d",&i);
if(i==1)
{
printf("please input your letter:\n");
scanf("%c",&b);
a=b;
printf("letter:%c ",b);
printf("Ascii:%d",a);
}
else
{
printf("input you Ascii number:\n");
scanf("%d",&a);
b=a;
printf("Ascii:%d ",a);
printf("letter:%c",b);
}

getch();
}

你只需要加一个清空键盘缓冲区的函数就行
fflush(stdin);

#include<stdio.h>
main()
{ int a,i;
char b;
printf("1:letter into Ascii number.\n");
printf("2:Ascii number into letter.\n");
scanf("%d%c",&i,&b);
if(i==1)
{
printf("please input your letter:\n");
scanf("%c",&b);
printf("letter:%c ",b);
printf("Ascii:%d",b);
}
else
{
printf("input you Ascii number:\n");
scanf("%d",&a);
printf("Ascii:%d ",a);
printf("letter:%c",a);
}

}

......

只要输入不要那么离普，我给你看的程序还可以接受

谢谢俄

谢谢，能简单介绍下这个函数吗？

看这个http://bbs.bc-cn.net/viewthread.php?tid=124890

函数名: fflush
功 能: 清除一个流
用 法: int fflush(FILE *stream);
程序例:
#include <string.h>
#include <stdio.h>
#include <conio.h>
#include <io.h>
void flush(FILE *stream);
int main(void)
{
FILE *stream;
char msg[] = "This is a test";
/* create a file */
stream = fopen("DUMMY.FIL", "w");
/* write some data to the file */
fwrite(msg, strlen(msg), 1, stream);
clrscr();
printf("Press any key to flush\
DUMMY.FIL:");
getch();
/* flush the data to DUMMY.FIL without\
closing it */
flush(stream);
printf("\nFile was flushed, Press any key\
to quit:");
getch();
return 0;
}
void flush(FILE *stream)
{
int duphandle;
/* flush the stream's internal buffer */
fflush(stream);
/* make a duplicate file handle */
duphandle = dup(fileno(stream));
/* close the duplicate handle to flush\
the DOS buffer */
close(duphandle);
}
转来的...

#include<stdio.h>
main()
{ int a,i;
char b;
printf("1:letter into Ascii number.\n");
printf("2:Ascii number into letter.\n");
scanf("%d",&i);
getchar(); //利用getchar()把回车"吃掉"在某贴看到的 呵呵
if(i==1)
{
printf("please input your letter:\n");
scanf("%c",&b);
a=b;
printf("letter:%c ",b);
printf("Ascii:%d",a);
}
else
{
printf("input you Ascii number:\n");
scanf("%d",&a);
b=a;
printf("Ascii:%d ",a);
printf("letter:%c",b);
}

getch();
}