C语言编程-凯撒加密

• Enter your msg:hello world! 123$%^
• Enter key=:10
• rovvy gybvn! 123$%^

    int key=0,msg_len=0;
    char caesar[80]={0};
        printf("Enter your msg:");
        for ( int i = 0; i < 80; i++) { //读取一串字符并计算长度
            if((caesar[i]=getchar())!='n') 
            msg_len++;
            else break;
        }
        printf("Enter key=:");scanf("%d",&key);
        for ( int j = 0; j< msg_len;j++) {
            if((caesar[j]>='a')&&(caesar[j]<='z'))
                caesar[j]=(caesar[j]-'a'+key)%26+'a';
            else if((caesar[j]>='A')&&(caesar[j]<='Z'))
                caesar[j]=(caesar[j]-'A'+key)%26+'A';
            else ;
            putchar(caesar[j]);
        }