Compilare: main.c: In function 'query': main.c:28:20: warning: implicit declaration of function 'pow' [-Wimplicit-function-declaration] double q = pow(x,1.0/i); ^~~ main.c:28:20: warning: incompatible implicit declaration of built-in function 'pow' main.c:28:20: note: include '<math.h>' or provide a declaration of 'pow' main.c:29:33: warning: implicit declaration of function 'floor' [-Wimplicit-function-declaration] long long q_new = power(floor(q), i); ^~~~~ main.c:29:33: warning: incompatible implicit declaration of built-in function 'floor' main.c:29:33: note: include '<math.h>' or provide a declaration of 'floor' main.c: In function 'main': main.c:55:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %lld\n", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:60:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld\n", &x); ^~~~~~~~~~~~~~~~~~~~~~~