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# include <stdio.h>
 
int main()
{
    int i, j, k;
     
    /* ±äÁ¿i´Ó0µ½4£¬±íʾËù»­ÁâÐÎͼµÄµÚÒ»ÖÁµÚÎåÐÐ */
    for(i = 0; i <= 4; i++)
    {
        /* µ±ÐÐÊýΪiʱ£¬¿Õ¸ñÊýÊÇiµÄº¯Êý£¬Îª4-i¸ö */
        for(j = 0; j <= 3-i; j++)
            printf(" ");
        /* ÐǺÅÊýÒ²ÊÇiµÄº¯Êý£¬Îª2i+1¸ö */
        for(k = 0; k <= 2*i; k++)
            printf("*");
        printf("\n");
    }
     
    /* ±äÁ¿i´Ó0µ½3£¬±íʾËù»­ÁâÐÎͼµÄµÚÁùÖÁµÚ¾ÅÐÐ */
    for(i = 0; i <= 3; i++)
    {
        /* µ±ÐÐÊýΪiʱ£¬¿Õ¸ñÊýÊÇiµÄº¯Êý£¬´ËʱΪi¸ö */
        for(j = 0; j <= i; j++)
            printf(" ");
        /* ÐǺÅÊýÒ²ÊÇiµÄº¯Êý£¬´ËʱΪ7-2i¸ö */
        for(k = 0; k <= 6-2*i; k++)
            printf("*");
        printf("\n");
    }
    return 0;
}


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C unsigned Ó÷¨

Àý£º#define NELE(a) (sizeof(a) / sizeof(a[0]))
int main() {
char str[] = {'E', 'M', 'C'};
for (int d=-1; d<=(NELE(str)-2);d++)
      printf("%c",str[d+1]);
return 0;
}
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C_¹ØÏµºÍÂß¼­ÔËËã

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# include <stdio.h>
 
int main()
{
    /* ¶¨ÒåÒ»¸öÕûÊýÀàÐ͵ıäÁ¿£¬ÓÃÀ´´æ·ÅºóÃæËãʽµÄÖµ */
    int logic;    
 
    int a = 1;
    int b = 2;
    int c = 3;
 
&n ......

C_¸Ä±ä×Ö·û±àÂëʵÏÖ¼òµ¥¼ÓÃÜ

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# include <stdio.h>
 
int main()
{
    /* ¶¨Òå×Ö·ûÐͱäÁ¿£¬²¢¸øËüÃǸ¶³õÖµ */
    char c1, c2, c3, c4, c5, c6, c7;
    c1 = 'C';
    c2 = 'h';
    c3 = 'i';
    c4 = 'n';
 & ......
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