#include <stdio.h>
int main() {
int a; // Declaration of an integer variable 'a'
int b = 10; // Declaration and initialization of an integer variable 'b' with the value 10
int c, d = 20; // Declaration of 'c' and initialization of 'd' with the value 20
int e = b + d; // Declaration and initialization of 'e' with the sum of 'b' and 'd'
printf("a: %d\n", a); // Printing the value of 'a'
printf("b: %d\n", b); // Printing the value of 'b'
printf("c: %d\n", c); // Printing the value of 'c' (uninitialized, result is undefined)
printf("d: %d\n", d); // Printing the value of 'd'
printf("e: %d\n", e); // Printing the value of 'e' (sum of 'b' and 'd')
return 0;
}