GATE | GATE CS Mock 2018 | Question 55

Predict the output?

int fun(char *str1)
{
  char *str2 = str1;
  while(*++str1);
  return (str1-str2);
}

int main()
{
  char *str = \"GeeksQuiz\";
  printf(\"%d\", fun(str));
  return 0;
}

(A)

10

(B)

9

(C)

8

(D)

Random Number

Answer: (B)

Explanation:

The function fun() basically counts number of characters in input string. Inside fun(), pointer str2 is initialized as str1. The statement while(*++str1); increments str1 till ‘\\0’ is reached. str1 is incremented by 9. Finally the difference between str2 and str1 is returned which is 9. 

Option (B) is correct.

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