#includestdio.h
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#includestring.h
void main ()
{
char str[100];
char str1[100];
printf("输入字符串:");
scanf("%s",str);
int len;
len=strlen(str);
for(int i=0;i＜len;i++)
{
str1[i]=(str[i]-97+3)%26+97;
}
str1[len]='\0';
printf ("密文为:%s\n",str1);
}
#include stdio.h
#include string.h
int main()
{
int i = 0;
int len = 0;
char ch;
char buf[256] = {0};
char nor[26] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
char enc[26] = {'s','u','w','y','a','c','e','g','i','k','m','o','q','r','t','v','x','z','b','d','f','h','j','l','n','p'};
printf("Encode or Decode: ");
scanf("%c",ch);
printf("please input your string: ");
fflush(stdin);
gets(buf);
len = strlen(buf);
switch (ch)
{
case 'e':
case 'E':
for (i=0;ilen;i++)
{
buf[i] = enc[buf[i] - 'a'];
}
break;
case 'd':
case 'D':
for (i=0;ilen;i++)
{
buf[i] = nor[i];
}
break;
default:
printf("wrong input!\n");
}
printf("%s\n",buf);
return 0;
}
#includestdio.h
#includestring.h
int main()
{
int i;int number;
char a[100];
scanf("%s",a);
number=strlen(a);
for(i=0;inumber;i++){
a[i]=a[i]+4;
}
for(i=0;inumber;i++){
printf("%c",a[i]);
}
return 0;
}
