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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <fcntl.h>
  5. #include <unistd.h>
  6.  
  7. int main()
  8. {
  9.         int fp;
  10.         int i;
  11.         int len;
  12.         char buf[300];
  13.  
  14. memset(buf, 0x00, 300);
  15.  
  16.         if((fp=open("texti",O_RDWR)) == 0)
  17.         {
  18.                 perror("open: ");
  19.                 exit(0);
  20.         }
  21.         write((int)fp,"Have a goodtime.", 16);
  22.         close((int)fp);
  23.  
  24.  
  25.  		//https://l...content-available-to-author-only...e.net/man/3/open
  26.  		//int open(const char *path, int oflag, ... );
  27.         if((fp=open("texti",O_RDWR)) == 0)
  28.         {
  29.                 perror("open: ");
  30.                 exit(0);
  31.         }
  32.  
  33. //fgets(buf,16,(FILE*)fp);
  34. read(fp, buf, 16);
  35. printf("%s\n", buf);
  36.  
  37.  /*
  38. 		//http://w...content-available-to-author-only...s.com/reference/cstdio/fgets/
  39. 		//char * fgets ( char * str, int num, FILE * stream );
  40.         while(fgets(buf,sizeof(buf),(FILE*)fp)!= NULL)
  41.         {
  42.                 len = strlen(buf);
  43.                 for(i=0; i<len; i++)
  44.                 {
  45.                         if((buf[i] >= 'a') && (buf[i] <= 'z'))
  46.                         {
  47.                                 buf[i] -= ('a'-'A');
  48.                         }
  49.                 } 
  50.  
  51.         }
  52. */
  53.  				//https://l...content-available-to-author-only...e.net/man/3/write
  54. 				//ssize_t write(int fildes, const void *buf, size_t nbyte);
  55.                 write((int)fp,buf,sizeof(buf));
  56.  
  57. 		//https://l...content-available-to-author-only...e.net/man/3/close
  58. 		//int close(int fildes);
  59.         close((int)fp);
  60.  
  61.         return 0;
  62. }
Success #stdin #stdout 0s 16064KB
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language:

						
C++ (gcc 8.3)

					

					

						
created:
								
						
7 years ago

					

					

						
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