cortex m4 code compilation and debug in simulation mode

In the Project options the processor is ARM Cortex M4
The debug mode is simulation

I am running the following application code
#include<stdio.h>
#include <stdlib.h>

FILE *fid;

int main(void)
{ int a; char buff[20];

fid = fopen("E:\\Testing\\keil_projects\\datar_proj\\readfile\\read.log","r"); if(fid == NULL) { a = a +1; } fread(buff,1,10,fid); fclose(fid); a = a + 1; printf("i am indian\n"); return 0;
}

There are no build errors.
When the code is run, the contents of the buff variable are and not as expected.