Compilare: user.c: In function ‘main’: user.c:60:9: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(N, 0, 501 * sizeof(int)); ^ user.c:60:9: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:63:9: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] N[0] = strlen(number); ^ user.c:63:16: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] N[0] = strlen(number); ^ user.c:50:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(in, "r", stdin); ^ user.c:51:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(out, "w", stdout); ^ user.c:55:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &T); ^ user.c:61:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%s", number); ^