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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. const char * filename = "/tmp/test.bin";
  6.  
  7. int main()
  8. {
  9.  
  10.     {
  11.         FILE * out = fopen(filename,"wb");
  12.         for(int i = 0; i < 100; ++i)
  13.         {
  14.             fwrite(&i,sizeof(int),1,out);
  15.         }
  16.         fclose(out);
  17.     }
  18.  
  19.     FILE* fp;
  20.     fp = fopen(filename, "rb");
  21.     if (fp == NULL)
  22.     {
  23.         fprintf(stderr, "Cannot open up file");
  24.         exit(EXIT_FAILURE);
  25.     }
  26.     char ch;
  27.     fseek(fp,0,SEEK_END);
  28.     int counter = ftell(fp)/sizeof(int);
  29.  
  30.     int * temp = (int*)malloc(sizeof(int)*counter);
  31.     if (temp == NULL)
  32.     {
  33.         fprintf(stderr, "Cannot give mem");
  34.         exit(EXIT_FAILURE);
  35.     }
  36.     fseek(fp,0,SEEK_SET);
  37.     int k=fread(temp, sizeof(int), counter, fp);
  38.  
  39.     printf("k = %d\n",k);
  40.     printf("temp[20] = %d\n",temp[20]);
  41. }
  42.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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k = 100
temp[20] = 20
https://ideone.com/3Jrube
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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