Language: C

char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}

Compiler output:
main.c:1:10: error: return type defaults to 'int' [-Wimplicit-int]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |          ^~~~
main.c: In function 'main':
main.c:1:26: error: initialization of 'double *' from incompatible pointer type 'char *' [-Wincompatible-pointer-types]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                          ^
main.c:1:36: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                                    ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
main.c:1:36: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                                    ^~~~~
main.c:1:36: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:50: error: implicit declaration of function 'getchar' [-Wimplicit-function-declaration]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                                                  ^~~~~~~
main.c:1:50: note: 'getchar' is defined in header '<stdio.h>'; this is probably fixable by adding '#include <stdio.h>'
main.c:1:64: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                                                                ^~~~~~
main.c:1:64: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:64: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:64: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:83: error: implicit declaration of function 'sscanf' [-Wimplicit-function-declaration]
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                                                                                   ^~~~~~
main.c:1:83: note: include '<stdio.h>' or provide a declaration of 'sscanf'
main.c:1:83: warning: incompatible implicit declaration of built-in function 'sscanf' [-Wbuiltin-declaration-mismatch]
main.c:1:83: note: include '<stdio.h>' or provide a declaration of 'sscanf'
main.c:1:149: error: expected ':' before ';' token
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |                                                                                                                                                     ^
      |                                                                                                                                                     :
main.c: At top level:
main.c:1:6: warning: array 's' assumed to have one element
    1 | char s[];main(){double*q=s,b;for(;~scanf("%s",s);getchar()<14&&printf("%f\n",*q))!sscanf(s,"%lf",q+1)?b=*q--,*q=*s&1?*q*b:*s>46?*q/b:*s>44?*q-b:*q+b;}
      |      ^