Compilare: main.cpp: In function 'void function()': main.cpp:61:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short j = i + 1; j < s.size() && s[j] != '+' && s[j] != '-'; ++j) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:115:39: 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); ^ main.cpp:116:41: 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); ^