Compilare: user.cpp: In function ‘int main()’: user.cpp:18:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:22:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s1+1); ^ /tmp/ccnT3niY.o: In function `main': user.cpp:(.text.startup+0x51): warning: the `gets' function is dangerous and should not be used.