View Compilation Error

0_0_16502151_22424.cpp:2:9: error: 'nt' was not declared in this scope
 int gcd(nt a,int b)
         ^
0_0_16502151_22424.cpp:2:14: error: expected primary-expression before 'int'
 int gcd(nt a,int b)
              ^
0_0_16502151_22424.cpp:2:19: error: expression list treated as compound expression in initializer [-fpermissive]
 int gcd(nt a,int b)
                   ^
0_0_16502151_22424.cpp:3:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_16502151_22424.cpp: In function 'int main()':
0_0_16502151_22424.cpp:12:34: error: 'gcd' cannot be used as a function
         printf("%d\n",m*n/gcd(m,n))
                                  ^