Main.cc: In function 'int main()': Main.cc:10:20: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int*' [-Wformat=] printf("max=%d",&c) ^ Main.cc:11:2: error: expected ';' before 'return' return 0; ^ Main.cc:5:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d,%d",&a,&b); ^