programming in c array -

i'm reading programming in c kochan, 3rd ed.

in introduction arrays (program 7.1) gives example:

#include <stdio.h>   int main(void) {     int values[10];     int index;      values[0] = 197;     values[2] = -100;     values[5] = 350;     values[3] = values[0] + values[5];     values[9] =     values[5] / 10;     --values[2];      ( index = 0; index < 10; ++index )         printf ("values[%i] = %i\n", index, values[index]);       return 0; } 

which should give output

values[0] = 197 values[1] = 0 values[2] = -101 values[3] = 547 values[4] = 0 values[5] = 350 values[6] = 0 values[7] = 0 values[8] = 0 values[9] = 35 

and quadriple-checking i'm using exact same code works halfway , gives me weird numbers [1], [4]

values[0] = 197 values[1] = 3210052 values[2] = -101 values[3] = 547 values[4] = 17704192 values[5] = 350 values[6] = 0 values[7] = 0 values[8] = 0 values[9] = 35 

i'm using cl arrays.c -o arrays compile.

local variables not initialized. means entries in array not explicitly initialize contain indeterminate values (values seen random).

actually, using uninitialized variables (or uninitialized entries of array) undefined behavior.