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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <errno.h>
  4.  
  5. int main() {
  6.     const char *inputs[] = {
  7.         "12345678901234567890",  // base 10
  8.         "0xFFEE",                // base 16
  9.         "0755",                  // base 8 (if base = 0)
  10.         "101010",                // base 2
  11.         "invalid123",            // invalid input
  12.     };
  13.  
  14.     int bases[] = {10, 0, 0, 2, 10};  // base 0 lets strtoull auto-detect
  15.  
  16.     for (int i = 0; i < 5; ++i) {
  17.         const char *str = inputs[i];
  18.         int base = bases[i];
  19.         char *endptr;
  20.         errno = 0;
  21.  
  22.         unsigned long long result = strtoull(str, &endptr, base);
  23.  
  24.         printf("Input: \"%s\" | Base: %d\n", str, base);
  25.         if (errno == ERANGE) {
  26.             printf("  ➤ Overflow occurred!\n");
  27.         } else if (endptr == str) {
  28.             printf("  ➤ No digits were found.\n");
  29.         } else {
  30.             printf("  ➤ Converted value: %llu\n", result);
  31.             if (*endptr != '\0') {
  32.                 printf("  ➤ Remaining string: \"%s\"\n", endptr);
  33.             }
  34.         }
  35.         printf("\n");
  36.     }
  37.  
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Input: "12345678901234567890" | Base: 10
  ➤ Converted value: 12345678901234567890

Input: "0xFFEE" | Base: 0
  ➤ Converted value: 65518

Input: "0755" | Base: 0
  ➤ Converted value: 493

Input: "101010" | Base: 2
  ➤ Converted value: 42

Input: "invalid123" | Base: 10
  ➤ No digits were found.
https://ideone.com/RZOfRZ
language:
C++14 (gcc 8.3)
created:
14 days ago
visibility:
public

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