#include <stdio.h>int *A, stkTop;int stkFunc(int opcode, int val){static int size = 0, stkTop = 0;switch (opcode) {case - 1: size = val; break;case 0: if (stkTop < size) A[stkTop++ ] = val; break;default: if (stkTop) return A[ - - stkTop];} return - 1;}int main(){ int B[20]; A = B; stkTop = - 1; stkFunc ( - 1, 10); stkFunc ( 0, 5); stkFunc ( 0, 10); printf ("%d\n", stkFunc(1, 0) + stkFunc(1, 0));}