C language recursion control -


the program function recursion, need know how control entire program

void count(int n) {   static int d=1;   printf("%d",n);   printf("%d",d);   d++;   if(n>1)     count(n-1);   printf("%d",d); }  void main() {   count(3); }

my expected output 

3122134

original output is

312213444

can please explain how 2 4's has added output?

please explain flow control program.

here you're friendly drawing understand why happens (the static not problem because update variable static int d, doing d++ inside function): enter image description here

when call recursion inside function, count(2) starts, count(3) not destroyed, sleeping, waiting subfunction count(2) finish. when happens, count(3) wakes , says "oh, finally! daughter count(2) has finished, it's turn finish". remember that, inside count(2), call count(1)...


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