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  1. #include <stdlib.h>
  2. #include <string.h>
  3. #include <stdio.h>
  4.  
  5. int main()
  6. {
  7.     const char* texts[] = { "foo=54", "foo=7h", "rubbish", NULL };
  8.     int pos, foo, i;
  9.     for (i = 0; texts[i]; i++)
  10.     {
  11.         printf("Is %s valid ? ", texts[i]);
  12.         if (sscanf(texts[i], "foo=%d%n", &foo, &pos) == 1 &&
  13.             pos == strlen(texts[i]))
  14.         {
  15.             printf("yes\n");
  16.         }
  17.         else
  18.         {
  19.             printf("no\n");
  20.         }
  21.     }
  22.     return 0;
  23. }
  24.  
Success #stdin #stdout 0.01s 1720KB
comments (?)
stdin 
Standard input is empty
stdout 
Is foo=54 valid ? yes
Is foo=7h valid ? no
Is rubbish valid ? no
https://ideone.com/d1rhPf
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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