Language: C

v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'v' [-Wimplicit-int]
main.c:1:7: error: type defaults to 'int' in declaration of 'p' [-Wimplicit-int]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |       ^
main.c:1:9: error: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |         ^
main.c:1:11: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |           ^
main.c:1:13: error: return type defaults to 'int' [-Wimplicit-int]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |             ^
main.c: In function 'f':
main.c:1:13: error: type of 'X' defaults to 'int' [-Wimplicit-int]
main.c:1:45: error: expected ';' before '}' token
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                             ^
      |                                             ;
main.c: At top level:
main.c:1:46: error: return type defaults to 'int' [-Wimplicit-int]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                              ^~~~
main.c: In function 'main':
main.c:1:46: error: type of 's' defaults to 'int' [-Wimplicit-int]
main.c:1:61: error: implicit declaration of function 'atoi' [-Wimplicit-function-declaration]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                             ^~~~
main.c:1:66: error: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                                  ^~~~
main.c:1:75: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                                           ^~~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
main.c:1:75: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                                           ^~~~~~
main.c:1:75: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:114: error: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                                                                                  ^~~~~~
main.c:1:1: note: include '<string.h>' or provide a declaration of 'strlen'
  +++ |+#include <string.h>
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
main.c:1:114: warning: incompatible implicit declaration of built-in function 'strlen' [-Wbuiltin-declaration-mismatch]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                                                                                  ^~~~~~
main.c:1:114: note: include '<string.h>' or provide a declaration of 'strlen'
main.c:1:121: error: passing argument 1 of 'strlen' makes pointer from integer without a cast [-Wint-conversion]
    1 | v[50],p,n,c;f(X){for(n=0;n<X;n+=v[p++]);c+=n}main(s){for(;n=atoi(gets(v));printf("%d\n",s)){for(p=s=0;p<n;v[++p]=strlen(gets(v+n)));for(c=0;c-31;)c=0,p=++s,f(5),f(7),f(5),f(7),f(7);}}
      |                                                                                                                         ^~~~~~~~~
      |                                                                                                                         |
      |                                                                                                                         int
main.c:1:121: note: expected 'const char *' but argument is of type 'int'