Compilare: main.c: In function 'gdc': main.c:7:20: warning: left-hand operand of comma expression has no effect [-Wunused-value] return(num2, num2 % num1); ^ main.c: In function 'main': main.c:14:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", &n); ^~~~~~~~~~~~~~~~~~~~~~ main.c:17:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d%d", &num1, &num2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~