Compilare: main.c: In function 'getINT': main.c:8:13: warning: implicit declaration of function 'isdigit' [-Wimplicit-function-declaration] while( !isdigit(ch = fgetc(fin)) && ch != EOF && ch != '-' ) {} ^~~~~~~ main.c: In function 'main': main.c:31:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d%d%d%d", &n, &m, &k, &c ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~