Dereferencing a pointer, continued
We now know that changing the value that a pointer points to
does not change the pointer (good!).
Now we'd like to change the value held in the address
that the pointer points to.
Similarly, this will not change the pointer itself.
int total;
int *p = &total ;
int bigger;
total = 8;
printf("value of variable total is: %i\n", total );
printf("value pointed to by pointer p is: %i\n\n", *p );
*p = *p + 2 ; // increment, by 2, the value that p points to
printf("value of variable total is: %i\n", total );
printf("value pointed to by pointer p is: %i\n\n", *p );
bigger = *p + 2 ; // just fetch the value that p points to
printf("value of variable total is: %i\n", total );
printf("value of variable bigger is: %i\n", bigger );
printf("value pointed to by pointer p is: %i\n", *p );
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CITS2002 Systems Programming, Lecture 11, p5, 28th August 2023.
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CITS2002