Language: C

h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'h' [-Wimplicit-int]
main.c:1:6: error: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |      ^
main.c:1:8: error: return type defaults to 'int' [-Wimplicit-int]
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |        ^~~~
main.c: In function 'main':
main.c:1:8: error: type of 'v' defaults to 'int' [-Wimplicit-int]
main.c:1:22: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |                      ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
main.c:1:22: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |                      ^~~~~
main.c:1:22: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:55: error: 'i' undeclared (first use in this function)
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |                                                       ^
main.c:1:55: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:92: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |                                                                                            ^~~~~~
main.c:1:92: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:92: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:92: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:111: error: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
    1 | h[8],j;main(v){for(;~scanf("%d.%*d",&v);j=1)h[v<165?2:i>184?7:v/5-30]+=j;for(;h[j]--||6/j&&printf("%d:",j++);)putchar(h[j]?42:10);}
      |                                                                                                               ^~~~~~~
main.c:1:111: note: include '<stdio.h>' or provide a declaration of 'putchar'