Language: C

a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |   ^
main.c:1:5: error: return type defaults to 'int' [-Wimplicit-int]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |     ^~~~
main.c: In function 'main':
main.c:1:5: error: type of 's' defaults to 'int' [-Wimplicit-int]
main.c:1:18: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                  ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
main.c:1:18: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                  ^~~~~
main.c:1:18: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:25: error: assignment to 'int' from 'char *' makes integer from pointer without a cast [-Wint-conversion]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                         ^
main.c:1:25: error: passing argument 1 of 'scanf' makes pointer from integer without a cast [-Wint-conversion]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                        ~^~~~~~~~~~
      |                         |
      |                         int
main.c:1:25: note: expected 'const char *' but argument is of type 'int'
main.c:1:43: error: 'x' undeclared (first use in this function)
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                                           ^
main.c:1:43: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:45: error: 'y' undeclared (first use in this function)
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                                             ^
main.c:1:47: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                                               ^~~~~~
main.c:1:47: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:47: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:47: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:54: error: passing argument 1 of 'printf' makes pointer from integer without a cast [-Wint-conversion]
    1 | a,b;main(s){for(;scanf(s="%d %d\n",&a,&b),x|y;printf(s,a>b?b:a,a>b?a:b));}
      |                                                      ^
      |                                                      |
      |                                                      int
main.c:1:54: note: expected 'const char *' but argument is of type 'int'