Understanding pointers

This program just demonstrates how to assign values to pointer variables. It serves no other purpose.

/* Problem: This program just demonstrates how to assign values to pointer variables. It serves no other purpose. */ #include <stdio.h> int main (void) { /* c and d are pointers to integers */ int a, b, *c, *d, e; a = 10; b = a * 3; c = &a; /* address of a goes into c */ d = &b; /* address of b goes into d */ e = *c + *d; /* *c is a and *d is b */ *d = a; d = &a; *c = *d - a % b + *c; printf ("Do you understand why\n"); printf ("a= %d, b= %d, e= %d ?\n", a, b, e); return (0); } Legend: preprocessor directives | variable declarations | main program | helper functions | user-defined structures | comments

Do you understand why a= 20, b= 10, e= 40 ?