Language: C

max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}

Compiler output:
main.c:1:1: error: return type defaults to 'int' [-Wimplicit-int]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      | ^~~
main.c: In function 'max':
main.c:1:1: error: type of 'x' defaults to 'int' [-Wimplicit-int]
main.c:1:1: error: type of 'y' defaults to 'int' [-Wimplicit-int]
main.c: At top level:
main.c:1:28: warning: data definition has no type or storage class
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                            ^
main.c:1:28: error: type defaults to 'int' in declaration of 'l' [-Wimplicit-int]
main.c:1:30: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                              ^
main.c:1:32: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                ^
main.c:1:34: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                  ^
main.c:1:36: error: return type defaults to 'int' [-Wimplicit-int]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                    ^~~~
main.c: In function 'main':
main.c:1:36: error: type of 'd' defaults to 'int' [-Wimplicit-int]
main.c:1:44: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                            ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
main.c:1:44: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                            ^~~~~
main.c:1:44: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:79: error: 'k' undeclared (first use in this function)
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                                                               ^
main.c:1:79: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:82: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | max(x,y){return (x>y?x:y);}l,a,b,c;main(d){scanf("%d%d%d%d%d",&l,&a,&b,&c,&d);k=!printf("%d\n",l-max(a/c+!!(a%c),b/d+!!(b%d)));}
      |                                                                                  ^~~~~~
main.c:1:82: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:82: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:82: note: include '<stdio.h>' or provide a declaration of 'printf'