题解 | #字符串加解密#

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

int main() {
    char a[1001];//要加密
    char b[1001];//要解密
    int i;
    scanf("%s",a);
    scanf("%s",b);
    int alen=strlen(a);
    int blen=strlen(b);
    for(i=0;i<alen;i++)
    {
        if(a[i]>='a'&&a[i]<='z')
        {
            if(a[i]=='z')
            {
                a[i]='A';
            }else{
                a[i]=a[i]-31;
            }
        }else if(a[i]>='A'&&a[i]<='Z')
        {
            if(a[i]=='Z')
            {
                a[i]='a';
            }else{
                a[i]=a[i]+33;
            }
        }else if(a[i]>='0'&&a[i]<='9')
        {
            if(a[i]=='9')
            {
                a[i]='0';
            }else{
                a[i]=a[i]+1;
            }
        }
        printf("%c",a[i]);
    }
    printf("\n");
    for(i=0;i<blen;i++)
    {
        if(b[i]>='a'&&b[i]<='z')
        {
            if(b[i]=='a')
            {
                b[i]='Z';
            }else{
                b[i]=b[i]-33;
            }
        }else if(b[i]>='A'&&b[i]<='Z')
        {
            if(b[i]=='A')
            {
                b[i]='z';
            }else{
                b[i]=b[i]+31;
            }
        }else if(b[i]>='0'&&b[i]<='9')
        {
            if(b[i]=='0')
            {
                b[i]='9';
            }else{
                b[i]=b[i]-1;
            }
        }
        printf("%c",b[i]);
    }
    return 0;
}