/in/foo.c: In function 'main':
/in/foo.c:7:10: error: 'o' undeclared (first use in this function)
int b,k=o;
^
/in/foo.c:7:10: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:11:14: error: 'j' undeclared (first use in this function)
for(int i=0;j<i;j++)
^
/in/foo.c:19:2: warning: implicit declaration of function 'printfz' [-Wimplicit-function-declaration]
printfz("%d",Sn);
^~~~~~~
/in/foo.c:21:2: error: 'renturn' undeclared (first use in this function)
renturn 0;
^~~~~~~
/in/foo.c:21:10: error: expected ';' before numeric constant
renturn 0;
^