Compilare: user.cpp: In function ‘int main()’: user.cpp:167:23: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(s!="") ^ user.cpp:184:27: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(s!="") ^ user.cpp:201:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(s!="") ^ user.cpp:158:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%c",&a); ^ user.cpp:214:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i\n",&n); ^ user.cpp:218:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%c",&a); ^