/in/ex2.c: In function 'main':
/in/ex2.c:5:5: warning: implicit declaration of function 'findgcd' [-Wimplicit-function-declaration]
     findgcd(a,b);
     ^~~~~~~
/in/ex2.c:3:30: warning: unused variable 'gcd' [-Wunused-variable]
     int a; int b; int i; int gcd;
                              ^~~
/in/ex2.c:3:23: warning: unused variable 'i' [-Wunused-variable]
     int a; int b; int i; int gcd;
                       ^
/in/ex2.c: In function 'findgcd':
/in/ex2.c:22:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^