Compilare: user.cpp: In function ‘int main()’: user.cpp:47:36: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ch == x && ch1 == y || ch1 == x && ch == y) ch = z; ^ user.cpp:48:41: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] else if(ch == y && ch1 == z || ch1 == y && ch == z) ch = x; ^ user.cpp:49:41: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] else if(ch == x && ch1 == z || ch1 == x && ch == z) ch = y; ^ user.cpp:17:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d ", &n); ^ user.cpp:20:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d ", &m); ^