Thread: read write prob

this program gives me the error
file.c:16: warning: passing arg 1 of `fwrite' makes pointer from integer without a cast

Here is the code----------------------
#include <stdlib.h>
#include <stdio.h>
#define N 100
#define mode w
long j;
int i;
main()
{
FILE *fp;
int filename[5];
filename[5] = (int) rand();
fp = fopen("filename[5]", "w");
for (i = 0; i < 100000; i++)
{
j = (int) rand();
if (fwrite(j, sizeof(int), sizeof(long), fp) != 100)
{
fprintf(stderr, "Error writing to file.");
exit(1);
}
fclose(fp);
}
}

----------------------------------

any suggestions?

try:

Code:

#include <stdlib.h>
#include <stdio.h>
#define N 100
#define mode w
int j;
int i;
int main() {
  FILE *fp;
  char filename[] = "C:\\test.txt";
  fp = fopen(filename, "wb");
  for (i = 0; i < 100000; i++)
  {
    j = (int) rand();
    if ( (fwrite(&j,      // const void * ptr - Your array
         sizeof(int),     // size of each element in array
         1,                   // number of elements in array
         fp) != 1)         // FILE * stream
    {
       fprintf(stderr, "Error writing to file.");
       exit(1);
    }
  }
    fclose(fp);
}

- Put code in code tags.
- Indicate which line the error belongs to. No one wants to count and we don't know if you have copied exactly.
- Indent your code.
- Do a tutorial.
- Check return value of fopen.
- Note that this writes values out in binary - not human readable.

Have Fun!

thanx for the code. I was really trying to make a randomly generated filename though, thats why i did the whole filename[5] = (int) rand(); thing.