Compilare: user.c: In function ‘main’: user.c:62:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(N, 0, 501 * sizeof(int)); ^ user.c:62:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:65:5: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] N[0] = strlen(number); ^ user.c:65:12: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] N[0] = strlen(number); ^ user.c:57:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &T); ^ user.c:63:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%s", number); ^