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  1. #include <ctype.h>
  2. #include <stdio.h>
  3.  
  4. int main(void) {
  5.     int sum = 0;
  6.     for (;;) {
  7.         int ch = getchar();
  8.         if (!isdigit((unsigned char)ch)) break; // leave loop with ENTER, EOF, 'a', ...
  9.         sum += ch - '0';
  10.     }
  11.     printf("sum of digits is %d.\n", sum);
  12.     return 0;
  13. }
  14.  
Success #stdin #stdout 0s 5360KB
comments (?)
stdin 
452387643264873257452354235423748723642364723546253465236452354723
stdout 
sum of digits is 282.
https://ideone.com/QTV7gh
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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