IGDTUW 2025 — Computer PYQ

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Question

IGDTUW 2025 — Computer PYQ

IGDTUW | Computer | 2025

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;

}

Choose the correct answer:

Explanation

The correct answer is (b) 9.

Explanation

This function calculates the length of a string by using pointer arithmetic.

Initialization: The pointer str2 is initialized to point to the same starting memory address as str1.
Pointer Traversal: The while (*++str1) loop increments the str1 pointer until it reaches the null terminator ('\0') at the end of the string.
Pointer Arithmetic: The final return (str1 - str2); calculates the number of characters between the end pointer (str1) and the start pointer (str2).

Conceptual Mathematical Model

Let the starting address be $A_{s t a r t}$ and the address of the null terminator be $A_{e n d}$ . The pointer arithmetic operation performs:

$L e n g t h = A_{e n d} - A_{s t a r t}$

For the string "GeeksQuiz", the number of characters is 9. Therefore, the difference between the final position of str1 and the initial position str2 is:

$s t r 1 - s t r 2 = 9$

Since the calculation resolves to the count of characters before the null character, the program outputs 9.