Compilare: user.c: In function ‘main’: user.c:27:1: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] len = strlen(path); ^ user.c:27:7: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] len = strlen(path); ^ user.c:18:30: warning: variable ‘result2’ set but not used [-Wunused-but-set-variable] long long V=0, E=0, result1, result2, len, i, P, last; ^ user.c:24:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &P); ^ user.c:25:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%s", path); ^