View Compilation Error

0_0_23706455_25045.cpp: In function 'int check(int)':
0_0_23706455_25045.cpp:26:12: error: 'a' was not declared in this scope
         if(a[i]>=x)
            ^
0_0_23706455_25045.cpp:30:19: error: 'a' was not declared in this scope
             while(a[j] < x)
                   ^
0_0_23706455_25045.cpp: In function 'int main()':
0_0_23706455_25045.cpp:49:24: error: 'a' was not declared in this scope
             scanf("%d",a+i);
                        ^