Compilare: user.cpp: In function ‘int main()’: user.cpp:5:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin); ^ user.cpp:6:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out","w",stdout); ^ user.cpp:9:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:43:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:47:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:79:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:86:25: warning: ‘nr4’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr1==nr3&&nr2==nr4){ ^ user.cpp:110:17: warning: ‘g’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr3=(nr4+g)%n2; ^ user.cpp:86:15: warning: ‘nr3’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr1==nr3&&nr2==nr4){ ^