Compilare: main.cpp: In function 'int main()': main.cpp:13:12: warning: unused variable 'rez' [-Wunused-variable] int p, rez, a, b, nr=0, x; ^~~ main.cpp:11:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("eq4.in", "r", stdin); ^ main.cpp:12:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("eq4.out", "w", stdout); ^ main.cpp:16:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &p); ^ main.cpp:62:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lld", &a, &b, &e); ^ main.cpp:61:13: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] val+=(nr*x); ~~~^~~