C

c read file content

char * buffer = 0;
long length;
FILE * f = fopen (filename, "rb");

if (f)
{
  fseek (f, 0, SEEK_END);
  length = ftell (f);
  fseek (f, 0, SEEK_SET);
  buffer = malloc (length);
  if (buffer)
  {
    fread (buffer, 1, length, f);
  }
  fclose (f);
}

if (buffer)
{
  // start to process your data / extract strings here...
}

c read file

#include <stdio.h>

#define n 1024 // n bytes

int main(void) {
	FILE *fp;
    size_t numread;
    if ((fp = fopen("yourfile.xy", "rb") != NULL) {
    	char buffer[n];
        numread = fread(buffer, sizeof(*buffer), n, fp);
      	printf("Read %d Bytes: %s", numread, buffer);
      
      	fclose(fp);
      	return 0;
    }
        
    return -1;
}

read file c

#include <stdio.h>
#include <stdlib.h>

int main()
{
   int num;
   FILE *fptr;

   if ((fptr = fopen("C:program.txt","r")) == NULL){
       printf("Error! opening file");

       // Program exits if the file pointer returns NULL.
       exit(1);
   }

   fscanf(fptr,"%d", &num);

   printf("Value of n=%d", num);
   fclose(fptr); 
  
   return 0;
}