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Begginers of system programming

// understanding ivt table #include<stdio.h> #include<dos.h> main() { unsigned long far *address = (unsigned long far *)0x00000000; unsigned long intadd[256]; unsigned int segment, offset; int i; FILE *fp; fp = fopen("IVT.txt", "wb"); for(i = 0; i < 256; i++) { intadd[i] = *(address++); segment = FP_SEG(intadd[i]); offset = FP_OFF(intadd[i]); fprintf(fp, "interrupt %3X : vector %Fp(hex) : %lu(dec) ", i, intadd[i], (unsigned long)segment * 16 + offset); } fclose(fp); }