Language: C

d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'd' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |   ^
main.c:1:9: error: expected declaration specifiers or '...' before '*' token
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |         ^
main.c:1:26: error: return type defaults to 'int' [-Wimplicit-int]
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |                          ^~~~
main.c: In function 'main':
main.c:1:39: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |                                       ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
main.c:1:39: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |                                       ^~~~~
main.c:1:39: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:53: error: implicit declaration of function 'qsort' [-Wimplicit-function-declaration]
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |                                                     ^~~~~
main.c:1:65: error: 'c' undeclared (first use in this function)
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |                                                                 ^
main.c:1:65: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:81: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |                                                                                 ^~~~~~
main.c:1:81: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:81: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:81: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c: At top level:
main.c:1:3: warning: array 'a' assumed to have one element
    1 | d,a[];c(*z){d=*z-*1[&z];}main(){for(;~scanf("%d",a);qsort(a,4,4,c));for(d=4;--d;printf("%d\n",a[d]));}
      |   ^