GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 42

Question

The provided C code is a version of the C string library function strlen(), which calculates the length of a given string.

unsigned int mystrlen(char *c)
{
    unsigned int i = 0;
    /* Your code here. */
}

Which line of code creates a working and accurate version of strlen()?

• A.

   
    if (*c == '\0') {
          return i;
      } else {
          return mystrlen(++c) + 1;
      }
  

• B.

   
    if (*c == '\0') {
          return i;
      } else {
          return mystrlen(c++) + 1;
      }
  

• C.

   
  while (*(c + i) != '\0') i++;
  return i;
  

• D.

   
  while (*(c + i) != '\0') ++i;
  return i;
  

Answer 1

if (*c == '\0') {

    return i;

} else {

    return mystrlen(c++) + 1;

}

This is incorrect. The post-increment c++  leads to Infinite loop. It is better to use pre-increment ++c

Since in "mystrlen(c++)", same value is passed every time