下面你看看是不是这样的：
main()
{
char a[] = "abcdeg";//有序的
char b[]="defhijklmn";//有序额
char c[80],*p;
int i=0,j=0,k=0;
while(a[i]!='\0'&&b[j]!='\0')
{
if(a[i]b[j])c[k++]=b[j++];
else
{
c[k++]=b[j++];i++;
}
}
while(a[i]=='\0'&&b[j]!='\0')
c[k++]=b[j++];
while(a[i]!='\0'&&b[j]=='\0')
c[k++]=a[i++];
c[k]='\0';
puts(c);
}