/in/foo.c: In function 'main':
/in/foo.c:3:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%d",&T);
     ^~~~~
/in/foo.c:3:5: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:3:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:3:17: error: 'T' undeclared (first use in this function)
     scanf("%d",&T);
                 ^
/in/foo.c:3:17: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:4:5: warning: implicit declaration of function 'For' [-Wimplicit-function-declaration]
     For(ii,1,T)
     ^~~
/in/foo.c:4:9: error: 'ii' undeclared (first use in this function)
     For(ii,1,T)
         ^~
/in/foo.c:5:5: error: expected ';' before '{' token
     {
     ^