假定输入为“Go west, young man!" , 以下程序会产生什么样的输出？为什么？   
1.
#include <stdio.h>
int main(void)
{
    char ch;
    scanf ("%c",&ch);
    while (ch != `g`)
    {
         printf ("%c",ch);
         scanf ("%c",&ch);
     }
     return 0;
}



2.
#include <stdio.h>
int main(void)
{
    char ch;
    scanf ("%c",&ch);
    while (ch != `g`)
    {
         printf ("%c",++ch);
         scanf ("%c",&ch);
     }
     return 0;
}





3.
#include <stdio.h>
int main(void)
{
    char ch;
    do{
      
          scanf ("%c",&ch);
          printf ("%c",ch);
     }while (ch !=`g`);
     return 0;
}
   


4.
#include <stdio.h>
int main(void)
{
    char ch;
    scanf ("%c",&ch);
    for(ch=`$`; ch != `g`; scanf ("%c",&ch))
        putchar (ch);
    return 0;
}  

3.
#include <stdio.h>
int main(void)
{
    char ch;
    do{
      
          scanf ("%c",&ch);
          printf ("%c",ch);
     }while (ch !=`g`);
     return 0;
}


 为啥它是输出 Go west, young 而不是  Go west, young man！ 呢？