Main.cc: In function 'int main()': Main.cc:16:1: error: 'ret' was not declared in this scope ret ^ Main.cc:16:1: error: expected '}' at end of input Main.cc:12:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&a,&b); ^