Question

C语言isalpha

#include<ctype.h>
#include<stdio.h>
void main()
{
char ch;
while((ch = getcher()) != '\n')
{
if(isalpha(ch))
putchar(ch+32);
else
putchar(ch);
}
putchar('ch');
}
Compiling...
scanf.c
F:\MyProjects\Note\scanf.c(133) : warning C4013: 'getcher' undefined; assuming extern returning int
scanf.obj - 0 error(s), 0 warning(s)

Linking...
scanf.obj : error LNK2001: unresolved external symbol _getcher
Debug/Note.exe : fatal error LNK1120: 1 unresolved externals
执行 link.exe 时出错.
Note.exe - 1 error(s), 0 warning(s)

Answer 1

#include<ctype.h>
#include<stdio.h>
  main()
{
char ch;
while((ch = getchar()) != '\n')
{
if(isupper(ch))
putchar(ch+32);
else
putchar(ch);
}
putchar(ch);
}