View Compilation Error

0_0_18276849_29421.cpp:17:14: error: 'Value' was not declared in this scope
 bool compare(Value v1,Value v2)
              ^
0_0_18276849_29421.cpp:17:23: error: 'Value' was not declared in this scope
 bool compare(Value v1,Value v2)
                       ^
0_0_18276849_29421.cpp:17:31: error: expression list treated as compound expression in initializer [-fpermissive]
 bool compare(Value v1,Value v2)
                               ^
0_0_18276849_29421.cpp:18:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_18276849_29421.cpp: In function 'int main()':
0_0_18276849_29421.cpp:27:28: error: 'value' was not declared in this scope
             scanf("%d %d",&value[i].w,&value[i].v);
                            ^
0_0_18276849_29421.cpp:31:14: error: 'value' was not declared in this scope
         sort(value+1,value+1+n,compare);
              ^