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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. int countLeadingSignBits(int32_t data) {
  5.     if (data == 0) {
  6.         // Special case for 0, which has no sign bit.
  7.         return 31;
  8.     }
  9.  
  10.     // Determine the value of the most significant bit (MSB)
  11.     int32_t msbValue = data < 0 ? 1 : 0;
  12.  
  13.     // Initialize count. Start with -1 since we are looking for MSB-1.
  14.     int count = -1;
  15.  
  16.     // Check each bit, starting from the MSB-1 position
  17.     for (int i = 31; i >= 0; --i) {
  18.         // Check if the current bit matches the MSB value.
  19.         if (((data >> i) & 1) == msbValue) {
  20.             count++;
  21.         } else {
  22.             break;
  23.         }
  24.     }
  25.  
  26.     return count;
  27. }
  28.  
  29. int main() {
  30.     int32_t data = 0b11001101; // Replace with your data
  31.     int leadingSignBits = countLeadingSignBits(data);
  32.  
  33.     // Output the result
  34.     printf("Number of leading sign bits minus one: %d\n", leadingSignBits);
  35.  
  36.     // If you want to store the result back in data, do so here
  37.     data = leadingSignBits;
  38.  
  39.     // Output the modified data
  40.     printf("Data is now: %d\n", data);
  41.  
  42.     return 0;
  43. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
Standard input is empty
stdout 
Number of leading sign bits minus one: 23
Data is now: 23
https://ideone.com/mnl3mJ
language:
C++ (gcc 8.3)
created:
16 days ago
visibility:
public

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