View Compilation Error

0_0_28884112_16806.cpp:2:9: error: 'a' was not declared in this scope
 int max(a,b)
         ^
0_0_28884112_16806.cpp:2:11: error: 'b' was not declared in this scope
 int max(a,b)
           ^
0_0_28884112_16806.cpp:2:12: error: expression list treated as compound expression in initializer [-fpermissive]
 int max(a,b)
            ^
0_0_28884112_16806.cpp:3:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_28884112_16806.cpp: In function 'int main()':
0_0_28884112_16806.cpp:25:18: error: 'max' cannot be used as a function
         m=max(m,t);
                  ^