Compilare: main.cpp: In function 'void p2()': main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<strlen(a)-1; i++){ ~^~~~~~~~~~~~ main.cpp:66:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i; j<strlen(a)-1; j++) a[j] = a[j+1]; ~^~~~~~~~~~~~ main.cpp:67:34: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] a[strlen(a)-1] = NULL; ^~~~ main.cpp:72:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(a); i++){ ~^~~~~~~~~~