View Compilation Error

0_0_37514572_10206.cpp: In function 'int main()':
0_0_37514572_10206.cpp:69:5: error: 'res' was not declared in this scope
     res += s[i].val;
     ^
0_0_37514572_10206.cpp:75:24: error: 'res' was not declared in this scope
       printf("%.1f\n", res*100);
                        ^