Compilare: main.cpp: In function 'int Test(char*)': main.cpp:16:50: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] else if(b[i]==')') {if(a[m-1]=='(') {a[m-1]=NULL; m--;} ^~~~ main.cpp:19:50: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] else if(b[i]==']') {if(a[m-1]=='[') {a[m-1]=NULL; m--;} ^~~~ main.cpp: In function 'int main()': main.cpp:38:40: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] else if(b[j]=='*') {a[m-1]=NULL; m--;} ^~~~ main.cpp: In function 'int Test(char*)': main.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type] } ^