prog.c: In function ‘pa’:
prog.c:16:1: warning: ‘return’ with no value, in function returning non-void
return;}
^~~~~~
prog.c:12:5: note: declared here
int pa(int a,int i){
^~
prog.c:22:5: error: too few arguments to function ‘pa’
pa(i+1);
^~
prog.c:12:5: note: declared here
int pa(int a,int i){
^~