func_code_string: #include <bits/stdc++.h>   int main() {     int x1, y1, r1, x2, y2, r2;     scanf( %d %d %d %d %d %d , &x1, &y1, &r1, &x2, &y2, &r2);     double ans;     ans = (sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)) - r1 - r2) / 2;     if (ans < 0)       if (r1 > r2)         ans = (r1 - r2 - sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))) / 2;       else         ans = ans =             (r2 - r1 - sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))) / 2;     if (ans < 0)       printf( 0.000000000 );     else       printf( %lf , ans);     return 0;   }   