Compilare: user.cpp: In function ‘int main()’: user.cpp:10:16: warning: unused variable ‘j’ [-Wunused-variable] int tc,i,n,j,semn,nr,flag,a,b,st,dr; ^ user.cpp:10:26: warning: unused variable ‘flag’ [-Wunused-variable] int tc,i,n,j,semn,nr,flag,a,b,st,dr; ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.in","r",stdin); ^ user.cpp:9:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.out","w",stdout); ^ user.cpp:11:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&tc); ^ user.cpp:15:21: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(ec); ^ /tmp/ccKXcKHt.o: In function `main': user.cpp:(.text.startup+0x82): warning: the `gets' function is dangerous and should not be used.