Compilare: main.cpp: In function 'int main()': main.cpp:18:34: warning: comparison of constant ''E'' with boolean expression is always true [-Wbool-compare] for(int i=0;i<commands[i]!='E';++i) { ~~~~~~~~~~~~~^~~~~ main.cpp:18:22: warning: suggest parentheses around comparison in operand of '!=' [-Wparentheses] for(int i=0;i<commands[i]!='E';++i) { ~^~~~~~~~~~~~ main.cpp:10:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("editor.in","r",stdin); ^ main.cpp:11:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("editor.out","w",stdout); ^ main.cpp:13:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ main.cpp:17:38: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(commands, 60001, stdin); ^