View Compilation Error

0_0_23576717_10959.cpp: In function 'int main()':
0_0_23576717_10959.cpp:8:26: error: expected primary-expression before '%' token
         scanf("%d %d",&a,%b);
                          ^
0_0_23576717_10959.cpp:9:13: error: 'j' was not declared in this scope
         for(j=a-1;j>=1;j--)
             ^
0_0_23576717_10959.cpp:12:23: error: 'j' was not declared in this scope
         printf("%d\n",j);
                       ^