View Compilation Error

0_0_18062784_9392.cpp: In function 'int main()':
0_0_18062784_9392.cpp:13:9: error: expected ';' before 'int'
         int a,b;
         ^
0_0_18062784_9392.cpp:14:23: error: 'a' was not declared in this scope
         scanf("%d%d",&a,&b);
                       ^
0_0_18062784_9392.cpp:14:26: error: 'b' was not declared in this scope
         scanf("%d%d",&a,&b);
                          ^
0_0_18062784_9392.cpp:23:20: error: 'n' was not declared in this scope
         else if(b>=n) printf("first\n");
                    ^