第一行是a到z 第二行b到a

#include<stdio.h>
void main() {
   char letters[26][26];
   char c;
   char d;
   int i, j;
   for(i=0; i<26; i++) {
     c = 'a' + i; 
     for(j=0; j<26; j++) {
        if(c > 'z') {
           c = 'a'; 
        }
        letters[i][j] = c;
        c++;
     }   
   }

   for(i=0; i<26; i++) {
      for(j=0; j<26; j++) {
          printf("%c",letters[i][j]);  
      }  
      printf("\n");
   }
}

运行结果 

#include "stdio.h"
int main(){
    char ch[26][26];
    int i,j;
    int k = 0;
    char s = 0;
    for(i=0;i<26;i++){
        k = 'a';
        for(j=0;j<26;j++){
            s = k+ (i+j) % 26;
            if(s>122){
            	s = s-26;	
            }
            ch[i][j] = s;
            printf("%c ",ch[i][j]);
        }
        printf("\n");
    }


    return 0;
}

运行结果

abcdefghijklmnopqrstuvwxyz
bcdefghijklmnopqrstuvwxyza
cdefghijklmnopqrstuvwxyzab
defghijklmnopqrstuvwxyzabc
efghijklmnopqrstuvwxyzabcd
fghijklmnopqrstuvwxyzabcde
ghijklmnopqrstuvwxyzabcdef
hijklmnopqrstuvwxyzabcdefg
ijklmnopqrstuvwxyzabcdefgh
jklmnopqrstuvwxyzabcdefghi
klmnopqrstuvwxyzabcdefghij
lmnopqrstuvwxyzabcdefghijk
mnopqrstuvwxyzabcdefghijkl
nopqrstuvwxyzabcdefghijklm
opqrstuvwxyzabcdefghijklmn
pqrstuvwxyzabcdefghijklmno
qrstuvwxyzabcdefghijklmnop
rstuvwxyzabcdefghijklmnopq
stuvwxyzabcdefghijklmnopqr
tuvwxyzabcdefghijklmnopqrs
uvwxyzabcdefghijklmnopqrst
vwxyzabcdefghijklmnopqrstu
wxyzabcdefghijklmnopqrstuv
xyzabcdefghijklmnopqrstuvw
yzabcdefghijklmnopqrstuvwx
zabcdefghijklmnopqrstuvwxy

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