Compilare: user.c: In function ‘cmmdc’: user.c:5:5: warning: variable ‘cmmdc’ set but not used [-Wunused-but-set-variable] int cmmdc; ^ user.c: At top level: user.c:18:6: warning: return type of ‘main’ is not ‘int’ [-Wmain] void main(){ ^ user.c: In function ‘cmmdc’: user.c:16:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:26:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &a); ^ user.c:27:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &b); ^