1171: encryption (pointer topic)

1171: encryption （ Pointer theme ）

Title Description
Encrypt a piece of plaintext . The encryption rules are as follows ： Put each character of ascii Subtract from the value of the code 24 As the encrypted value of each character , for example ’a’ Of ascii The value of the code is 97, Then encryption becomes 73.“73" Namely ’a’ The ciphertext of , for example , character string "abc”, After encryption, it becomes "737475", Last , The whole ciphertext will be flipped again , Get the final ciphertext "574737". Now please write the program , Encrypt a piece of text . Please define and use the following functions ：
void encrypt(char *plain, char *cipher)
{
// Put the original string plain After encryption, store the string cipher
}
Input
Enter a string , Contains only numbers and letters , The longest is 200.
Output
Output encrypted string .
The sample input Copy
zero12
Sample output Copy
625278097789
Tips
Of course, outputting ciphertext directly is the simplest way , But this question requires you to store the ciphertext in a string ( For use by other modules of the program ）.
source / classification

#include<stdio.h>
#include<string.h>
#define N 202
/*  Numeric and alphabetic ASCII code -24 After all 2 digit  */
void encrypt(char *plain,char *cipher){
    
    int j=0,len;
    len=strlen(plain);
    for(int i=len-1;i>=0;i--){
    
        cipher[j++]=(int)(plain[i]-24)%10+'0';
        cipher[j++]=(int)(plain[i]-24)/10+'0';
    }
    cipher[j]='\0';
}
int main(){
    
    char *p,*q;
    p=(char *)malloc(sizeof(char)*N);
    q=(char *)malloc(sizeof(char)*(2*N));
    gets(p);

    encrypt(p,q);
    puts(q);
    return 0;
}