Compilare: main.cpp: In function 'int main()': main.cpp:17:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&cer); ^ main.cpp:68:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%lld",&a,&b,&sol); ^ main.cpp:34:24: warning: 'ca' may be used uninitialized in this function [-Wmaybe-uninitialized] else if (ca=='+' || ca=='-') ~~^~~~~ main.cpp:35:21: warning: 'semn' may be used uninitialized in this function [-Wmaybe-uninitialized] sum1+=semn; ~~~~^~~~~~