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1.1        strstr
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void test_strstr()
{
        char *str="Borland   International";
        char *str1="B",*ptr1;
        char *str2="na",*ptr2;
        char *str3="",*ptr3;
            
        ptr1=strstr(str,str1);    
        printf("The   substring1   is:   %s\n",   ptr1);//Borland   International
          
         ptr2=strstr(str,str2);    
        printf("The   substring2   is:   %s\n",   ptr2);//national
 
         ptr3=strstr(str,str3);    
        printf("The   substring3   is:   %s\n",   ptr3); //Borland   International
}   
/*****************************************************
  char *strstr( const char *string, const char *strCharSet );
  Each of these functions returns a pointer to the first occurrence of strCharSet in string,
  or NULL if strCharSet does not appear in string. If strCharSet points to a string of zero length,
  the function returns string.
  ******************************************************/
1.2   atoiºÍ_itoa
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void char2int_1()
{
char* temp1="123";
int a1=atoi(temp1);
printf("char2int_1()\ta1+1=%