Compilare: user.c: In function ‘main’: user.c:26:5: warning: implicit declaration of function ‘sqrt’ [-Wimplicit-function-declaration] sqrtN = (sqrt(numar)); ^ user.c:26:14: warning: incompatible implicit declaration of built-in function ‘sqrt’ [enabled by default] sqrtN = (sqrt(numar)); ^ user.c:12:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c:16:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &numar); ^