运行 ID: 93888

Main.cc:6:9: warning: multi-character character constant [-Wmultichar]
  printf('%.2f',a*b/2);
         ^~~~~~
Main.cc: In function ‘int main()’:
Main.cc:6:21: error: invalid conversion from ‘int’ to ‘const char*’ [-fpermissive]
  printf('%.2f',a*b/2);
                     ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:46,
                 from Main.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:102:1: note:   initializing argument 1 of ‘int printf(const char*, ...)’
 printf (const char *__restrict __fmt, ...)
 ^~~~~~