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#include <stdio.h>
int main()
{
int i;
char s[100];
printf("请输入一个需要加密的字符串:");
gets(s);
for (i=0; s[i]; i++)
{
if (s[i] >='w' && s[i] <= 'z')
{
s[i] = s[i] + 3 - 'z' + 'a';
}
else if (s[i] >='W' && s[i] <= 'Z')
{
s[i] = s[i] + 3 - 'Z' + 'A';
}
else
{
s[i] = s[i] + 4;
}
}
printf("加密后的字符串:");
puts(s);
return 0;
}
char c1,c2,c3,c4,c5;
c1='C'+4;
c2='h'+4;
c3='i'+4;
c4='n'+4;
c5='a'+4;