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C_ÔÚswitch

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# include <stdlib.h>
# include <stdio.h>
 
int main()
{
    int month;
    int day;
     
    printf("please input the month number: ");
    scanf("%d", &month);
    switch (month)
    {
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12: day=31; // ÓÐ31ÌìµÄÔ·ÝÇé¿ö
             break;
    case 4:
    case 6:
    case 9:
    case 11: day=30; // ÓÐ30ÌìµÄÔ·ݵÄÇé¿ö
             break;
    case 2:  day=28; // ·ÇÈòÄêµÄ2ÔÂÓÐ28Ìì
             break;
    default: exit(0);
    }
    printf("1999.%d has %d days.\n", month, day);
    return 0;
}
 
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# include <stdio.h>
 
int main()
{
    /* ¶¨ÒåÒ»¸öÕûÐÎÖ¸Õëp */
    int *p;
    int begin, end;
 
    begin = 10;
    /* ¸øÖ¸Õëp¸³³õÖµ */
    p = &begin;
  & ......

C_ʹÓÃforÑ­»·»­ÁâÐÎ

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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++)
    {
        /* ......
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