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  1. #include<stdio.h>
  2.  
  3. /**
  4.  * My custom recursive function to calculate power of two
  5.  */
  6. unsigned int twoPow(unsigned int n){    
  7.     if(n == 0)
  8.         return 1;
  9.  
  10.     /**
  11.      * this is our recursive counter we need to decrease it otherwise it will go to infinite loop
  12.      */
  13.     n--;    
  14.  
  15.     /**
  16.      * simply keep multiplying 2 given times to get power of two
  17.      */
  18.     return 2 * twoPow(n); 
  19. }
  20.  
  21. int main(){
  22.     char s[32];
  23.     unsigned int i,j,sum;   /* here i used unsigned since none of our input or outputs are negative */
  24.  
  25.     while (gets(s)){
  26.         /*
  27.          * check if its 0 then exit, Maybe even deleting the NULL check will work for this problem
  28.          */
  29.         if(s[0] == '0' && s[1] == '\0')    
  30.             return 0;
  31.  
  32.         sum = 0;
  33.  
  34.         /**
  35.          * get the string length
  36.          */
  37.         for(i = 0; s[i]; ++i);  
  38.  
  39.         for(j = 0; s[j]; ++j)
  40.         /**
  41.          * convert character to integer, then multiply 2 to the power n, then subtract 1 and add to sum
  42.          */
  43.             sum = sum + (s[j] - 48) * (twoPow(i - j) - 1);  
  44.  
  45.         printf("%u\n", sum);
  46.     }
  47.     return 0;
  48. }
Success #stdin #stdout 0s 2116KB
comments (?)
stdin
copy 
10120
200000000000000000000000000000
10
1000000000000000000000000000000
11
100
11111000001110000101101102000
0
stdout
copy 
44
2147483646
3
2147483647
4
7
1041110737
https://ideone.com/IYc2ph
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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