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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.   FILE *fp;
  5.   int c;
  6.  
  7.   fp = fopen("test.txt", "a");
  8.   if (fp != 0) {
  9.     fwrite("abcdefg", 7, 1, fp);
  10.     fseek(fp, 0, SEEK_SET);
  11.     fwrite("ABC", 3, 1, fp);
  12.     fclose(fp);
  13.   }
  14.  
  15.   fp = fopen("test.txt", "rb");
  16.   if (fp != 0) {
  17.     while ((c = fgetc(fp)) != EOF)
  18.       putchar(c);
  19.     fclose(fp);
  20.   }
  21.   return 0;
  22. }
  23. /* end */
  24.  
Success #stdin #stdout 0s 4456KB
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https://ideone.com/RG43Xw
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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