/* *   test file:  recursive.c- *   test recursive call *    *   calculate sum of 1 to 100 */// username: yq11int fun(int a);int main(){  int i = 100;  i = fun(i);  println("i="~i);  return 0;}int fun(int a){   if(a==0)     return a;   return  a + fun(a-1);}