Compilare: user.c: In function ‘init’: user.c:34:2: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] a = (int*)malloc(100 * sizeof(int)); ^ user.c:34:12: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] a = (int*)malloc(100 * sizeof(int)); ^ user.c: In function ‘main’: user.c:51:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf,"%d", &x); ^