Compilare: user.cpp: In function ‘int main()’: user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < strlen(c); j++) ^ user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < strlen(c); j++) ^ user.cpp:62:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j <strlen(d) ; j++) ^ user.cpp:70:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (nr=0){ ^