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What happens when you overflow
C Language Fundamentals example from a Well House Consultants training course
More on C Language Fundamentals [link]
Source code: t2.c Module: C201
#include <stdio.h>
#define SYZE 16 /* An example of overflowing the capacity of an integer in C */ main () { /* Set up a table of values (successive memory locations) */ long int series[SYZE]; int n; long int smallest; /* Store values in the table */ series[0] = 1; series[1] = -2; for (n=2; n<SYZE; n++) { series[n] = series[n-1] * series[n-2]; } /* Read them back */ for (n=SYZE-1; n>=0; n--) { printf("At posn %d we have %ld in the series\n",n,series[n]); } smallest = series[0]; for (n=0; n<SYZE; n++) { if (smallest > series[n]) smallest = series[n]; } printf ("smallest is %ld\n",smallest); } /* Runs as follows: munchkin:c12 grahamellis$ ./t2 At posn 15 we have 0 in the series At posn 14 we have 0 in the series At posn 13 we have 0 in the series At posn 12 we have 0 in the series At posn 11 we have 0 in the series At posn 10 we have -36028797018963968 in the series At posn 9 we have 17179869184 in the series At posn 8 we have -2097152 in the series At posn 7 we have -8192 in the series At posn 6 we have 256 in the series At posn 5 we have -32 in the series At posn 4 we have -8 in the series At posn 3 we have 4 in the series At posn 2 we have -2 in the series At posn 1 we have -2 in the series At posn 0 we have 1 in the series smallest is -36028797018963968 munchkin:c12 grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
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