Compilare: user.cpp: In function ‘void divide(int, int, int, int)’: user.cpp:14:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(x1<=x2 and y1<=y2) ^ user.cpp: In function ‘int main()’: user.cpp:47:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:54:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i]>='0' and a[i]<='9' and i<strlen(a)) ^