scanf5.cpp:2:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
2 | main(){int a,b;scanf("%d%d",&a,&b);if((a+b)%2)printf("%d.5",(a+b)/2);else printf("%d",(a+b)/2);}
| ^~~~
scanf5.cpp: In function 'int main()':
scanf5.cpp:2:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
2 | main(){int a,b;scanf("%d%d",&a,&b);if((a+b)%2)printf("%d.5",(a+b)/2);else printf("%d",(a+b)/2);}
| ~~~~~^~~~~~~~~~~~~~