/in/foo.c: In function 'main':
/in/foo.c:7:2: error: 'sum' undeclared (first use in this function)
  sum=a+b;
  ^~~
/in/foo.c:7:2: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:8:2: warning: implicit declaration of function 'print' [-Wimplicit-function-declaration]
  print("sum=%d",sum)
  ^~~~~
/in/foo.c:9:1: error: expected ';' before '}' token
 }
 ^