/in/foo.c: In function 'main':
/in/foo.c:13:3: warning: implicit declaration of function 'pow' [-Wimplicit-function-declaration]
 y=pow(2)5*x+10;
   ^~~
/in/foo.c:13:3: warning: incompatible implicit declaration of built-in function 'pow'
/in/foo.c:13:3: note: include '<math.h>' or provide a declaration of 'pow'
/in/foo.c:13:3: error: too few arguments to function 'pow'
/in/foo.c:13:9: error: expected ';' before numeric constant
 y=pow(2)5*x+10;
         ^