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  1. #include <errno.h>
  2. #include <stdio.h>
  3.  
  4. int main() {
  5.   int total = 0;
  6.   double acc = 0, val;
  7.  
  8.   for (;;) {
  9.     fputs("Value: ", stdout);
  10.     fflush(stdout);
  11.  
  12.     errno = 0;
  13.     int res = fscanf(stdin, "%lf", &val);
  14.  
  15.     if (res == EOF) {
  16.       // Handle successful end of input or read error.
  17.       if (errno == 0) {
  18.         fprintf(stdout, "Done! You entered %d values averaging %f.\n", total, acc / total);
  19.       } else {
  20.         fputs("There was an error, aborting!\n", stdout);
  21.       }
  22.       break;
  23.     } else if (res == 0) {
  24.       // Handle parse error.
  25.       fputs("Sorry, I did not understand. Try again.\n", stdout);
  26.       clearerr(stdin);
  27.       for (int r = 0; r != EOF && r != '\n'; r = fgetc(stdin)) {}
  28.     } else {
  29.       // Handle successful input.
  30.       acc += val;
  31.       ++total;
  32.     }
  33.   }
  34. }
  35.  
Success #stdin #stdout 0s 2160KB
comments (?)
stdin
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5
foo
10
15
stdout
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Value: Value: Sorry, I did not understand. Try again.
Value: Value: Value: Done! You entered 3 values averaging 10.000000.
https://ideone.com/c1RhsT
language:
C99 (gcc 8.3)
created:
9 years ago
visibility:
public

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