Compilare: main.cpp: In function 'int main()': main.cpp:22:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(c)n-=c; st[n+1]=NULL; ^~ main.cpp:22:16: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if(c)n-=c; st[n+1]=NULL; ^~ main.cpp:22:24: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] if(c)n-=c; st[n+1]=NULL; ^~~~