Compilare: user.cpp: In function ‘void calcul(int, int, int, int)’: user.cpp:13:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[p]=='*') ^ user.cpp:27:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[l1][c1]=s[p++]; ^ user.cpp:31:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p]>='0'&&s[p]<='9') ^ user.cpp:31:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p]>='0'&&s[p]<='9') ^ user.cpp:35:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i][j]=s[p]; ^ user.cpp: In function ‘int main()’: user.cpp:43:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compresie.in","r",stdin); ^ user.cpp:44:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compresie.out","w",stdout); ^ user.cpp:46:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccQJuwGm.o: In function `main': user.cpp:(.text.startup+0x5b): warning: the `gets' function is dangerous and should not be used.