Compilare: user.c: In function ‘main’: user.c:37:9: warning: implicit declaration of function ‘pow’ [-Wimplicit-function-declaration] z=pow(2,pa)-1; ^ user.c:37:11: warning: incompatible implicit declaration of built-in function ‘pow’ [enabled by default] z=pow(2,pa)-1; ^ user.c:22:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&t); ^ user.c:25:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&n); ^ user.c:31:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&a); ^