main()1main() 2 { 3 int a,b,c; 4 int *pa, *pb, *pc; 5 int **ppa, **ppb, **ppc; 6 int i,j,k,x,y,z; 7 8 a = 10; 9 b = 20; 10 c = 30; 11 pa = &a; pb = &b; pc = &c; 12 ppa = &pa; ppb = &pb; ppc = &pc; 13 x = 0; y = 0; z = 0; 14 15 for(i=0;i<10;i++){ 16 if( pa == &a ) pa = &b; 17 else pa = &a; 18 while( (*pa)-- ){ 19 x++; 20 if( (*pa) < 3 ) break; 21 else pa = &b; 22 } 23 x++; 24 pa = &b; 25 } 26 27 if ((*pa) != -5 || (*pb) != -5 || x != 43) 28 abort (); 29 30 exit (0); 31 } 32