Language: C

main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}

Compiler output:
main.c:1:1: error: return type defaults to 'int' [-Wimplicit-int]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      | ^~~~
main.c: In function 'main':
main.c:1:1: error: type of 'a' defaults to 'int' [-Wimplicit-int]
main.c:1:25: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                         ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
main.c:1:25: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                         ^~~~~
main.c:1:25: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:66: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                                                                  ^~~~~~
main.c:1:66: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:66: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:66: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:83: error: 'd' undeclared (first use in this function)
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                                                                                   ^
main.c:1:83: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:91: error: implicit declaration of function 'puts' [-Wimplicit-function-declaration]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                                                                                           ^~~~
main.c:1:91: note: include '<stdio.h>' or provide a declaration of 'puts'
main.c:1:118: error: implicit declaration of function 'exit' [-Wimplicit-function-declaration]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                                                                                                                      ^~~~
main.c:1:1: note: include '<stdlib.h>' or provide a declaration of 'exit'
  +++ |+#include <stdlib.h>
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
main.c:1:118: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
    1 | main(a){float b,c;for(;~scanf("%d,%f,%f",&a,&b,&c);)b/(c*c)>=25&&printf("%d\n",a),d++;!d&&puts("ツ該ツ督鳴づ按つオ");exit(0);}
      |                                                                                                                      ^~~~
main.c:1:118: note: include '<stdlib.h>' or provide a declaration of 'exit'