Compilare: main.c:3:6: warning: return type of 'main' is not 'int' [-Wmain] void main(void) { ^~~~ main.c: In function 'main': main.c:8:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a); ^~~~~~~~~~~~~~~~~~~~ main.c:9:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &b); ^~~~~~~~~~~~~~~~~~~~