Compilare: main.c: In function 'A': main.c:6:24: warning: array subscript has type 'char' [-Wchar-subscripts] printf("%c ",p[i]-'0'); ^ main.c:11:14: warning: array subscript has type 'char' [-Wchar-subscripts] if(!u[i]) ^ main.c:12:14: warning: array subscript has type 'char' [-Wchar-subscripts] p[k]=i,u[i]=1,A(k+1),u[i]=0; ^ main.c:12:21: warning: array subscript has type 'char' [-Wchar-subscripts] p[k]=i,u[i]=1,A(k+1),u[i]=0; ^ main.c:12:35: warning: array subscript has type 'char' [-Wchar-subscripts] p[k]=i,u[i]=1,A(k+1),u[i]=0; ^ main.c: In function 'main': main.c:14:92: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'char *' [-Wformat=] int main() { freopen("permutari.in","r",stdin),freopen("permutari.out","w",stdout),scanf("%d",&n),A(1); } ^ main.c:14:14: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] int main() { freopen("permutari.in","r",stdin),freopen("permutari.out","w",stdout),scanf("%d",&n),A(1); } ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:48: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] int main() { freopen("permutari.in","r",stdin),freopen("permutari.out","w",stdout),scanf("%d",&n),A(1); } ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:84: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] int main() { freopen("permutari.in","r",stdin),freopen("permutari.out","w",stdout),scanf("%d",&n),A(1); } ^~~~~~~~~~~~~~