IGDTUW 2026 — Computer PYQ

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Question

IGDTUW 2026 — Computer PYQ

IGDTUW | Computer | 2026

What is the output of the following C++ program?

#include <iostream>

using namespace std;

int main() {

unsigned char x = 255;

x++;

cout << int(x);

return 0;

}

Choose the correct answer:

Explanation

Step-by-Step Explanation:

Data Type Range:
An unsigned char in C++ typical occupies $1$ byte ( $8$ bits) of memory. The range of values it can store is from $0$ to $2^{8} - 1$ , which equals:
$0 to 255$
Initialization:
The variable $x$ is initialized to its maximum possible value:
$x = 255$
Increment and Wrap-around (Overflow):
When the post-increment operator x++ is executed, $1$ is added to $255$ .
Since an unsigned integer type cannot exceed its maximum limit ( $255$ ), it safely overflows and wraps around to the beginning of its range (modulo arithmetic, i.e., $(255 + 1) (mod 256)$ ):
$255 + 1 \to 0$
Type Casting and Output:
The code int(x) explicitly type-casts the character value to an integer so that cout prints it as a numeric value instead of an ASCII character code. Since the wrapped-around value of $x$ is $0$ , the final output is:
$0$