View Compilation Error

0_0_29197965_14972.cpp:8:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_29197965_14972.cpp: In function 'int main()':
0_0_29197965_14972.cpp:22:29: error: 'cal' cannot be used as a function
         printf("%d\n" ,cal(n));
                             ^