View Compilation Error

0_0_20199931_5101.cpp: In function 'int main()':
0_0_20199931_5101.cpp:16:21: error: 'c' was not declared in this scope
    printf("%.6f\n", c[i]);
                     ^
0_0_20199931_5101.cpp:16:23: error: 'i' was not declared in this scope
    printf("%.6f\n", c[i]);
                       ^