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µÚÁùÕ´𰸠c primer plus

 6.1 ±àдһ¸ö³ÌÐò,´´½¨Ò»¸ö¾ßÓÐ26¸öÔªËØµÄÊý×é,²¢ÔÚÆäÖд洢26¸öСд×Öĸ,²¢ÈøóÌÐòÏÔʾ¸ÃÊý×éµÄÄÚÈÝ.
#include <stdio.h>
int main(void)
{
 char a[26] = {'a', 'b', 'c', 'd', 'e', 'f',
     'g', 'h', 'i', 'j', 'k', 'l',
     'm', 'n', 'o', 'p', 'q', 'r',
     's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
 int i;
 for(i = 0; i < 26; i++)
  printf("%c", a[i]);
 return 0;
}
==============================================================
6.2 ʹÓÃǶÌ×Ñ­»·²úÉúÏÂÁÐͼ°¸:
$
$$
$$$
$$$$
$$$$$
#include <stdio.h>
int main(void)
{
 int i , j, k;
 for(i = 0; i < 5; i++)
 {
  k = i + 1;
  for(j = 0; j< k; j++)
   printf("$");
  printf("\n");
 }
 return 0;
}
==============================================================
6.3 ʹÓÃǶÌ×Ñ­»·²úÉúÏÂÁÐͼ°¸:
F
FE
FED
FEDC
FEDCB
FEDCBA
#include <stdio.h>
int main(void)
{
 char fedcba[6] = {"FEDCBA"};
 int i, j, k;
 for(i = 0; i < 6; i++)
 {
  k = i + 1;
  for(j = 0; j < k; j++)
   printf("%c", fedcba[j]);
  printf("\n");
 }
 return 0;
}
==============================================================
 6.4 ÈóÌÐòÒªÇóÓû§ÊäÈëÒ»¸ö´óд×Öĸ,ʹÓÃǶÌ×Ñ­»·²úÉúÏñÏÂÃæÕâÑùµÄ½ð×ÖËþͼ°¸:
                    A
               ABA
          ABCBA  
     ABCDCBA
ABCDEDCBA
#include <stdio.h>
int main(void)
{
 int len;
 char flag;
 int i,n,p,q;
 printf("Please input trigger character:");
 scanf("%c", &flag);
 printf("Please input length:");
 scanf("%d", &len);
 for(i = 0; i < le


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