2. 输入一个以回车结束的字符串

#include <stdio.h>
#include <string.h>

main ()
{
int i;
char in[81],out[162];
gets(in);
for (i=0;i<strlen(in);i++)
{
if (in[i]>='A' && in[i]<= 'Z')
{
out[i]=in[i]+('M'-in[i])*2+1;
}
else
{
out[i]=in[i];
}
}
out[i]='\0';
strcat(out,in);
puts(out);
getch();
}

#include <stdio.h>
#include <string.h>

#define MAX 100 //输入字符串的最大长度
#define NA 65 //A值为65
#define NLEN 26 //26个字母

int main()
{
char *p = new char[MAX];
scanf("%s", p);

int nLen = strlen(p);
p[nLen] = '\0';

int n = nLen;
while (n-- > -1)
{
if (!(((p[n] > NA + NLEN) || (p[n] < NA)))) //只在为大写字母时执行
{
p[n] = NA + NLEN - 1