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#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    int arr[10000];
    FILE * fp;
    if((fp = fopen("test","w"))==NULL){
        printf("Failed to open the file");
        exit(1);
    }
    for(int i=0; i<10000; i++){
          int rn=rand();
    fprintf(fp,"%i\n", rn);
        }
        fclose(fp);
    FILE * nf;
    if((nf = fopen("test","r"))==NULL){
        printf("Failed to open the file");
        exit(1);
    }
    if(fread(arr,sizeof(int),10000,nf)!=10000){
        if(feof(nf)) printf("File ended!");
        else printf("Error reading file");
    }
    for(int j=0;j<10000;j++)
        printf("%i\n",arr[j]);
 
    return 0;
 
}

prog.c: In function ‘main’:
prog.c:12:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for(int i=0; i<10000; i++){
     ^
prog.c:12:5: note: use option -std=c99 or -std=gnu99 to compile your code
prog.c:26:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for(int j=0;j<10000;j++)
     ^

Standard output is empty