CUET PG 2021 — Computer PYQ

Solution

Iska result Compiler Error ya Undefined Behavior/Garbage Value hoga.

1. Syntax Errors:

   • Void, Int, foat—C language case-sensitive hai, isliye lowercase (void, int, float) hona chahiye.

   • printf mein foat ki spelling galat hai aur ptr ko cast karte waqt * miss ho sakta hai.

2. Logical Error (Type Punning):

   Agar hum maan lein ki syntax sahi hai: *(float*)ptr, toh bhi result galat aayega.

   • Yahan $x$ ek integer hai ($18$).

   • Pointer $ptr$ us integer ka address store kar raha hai.

   • Jab aap (float*)ptr karte hain, toh compiler us memory address ko ek float ki tarah read karne ki koshish karta hai.

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Mathematical & Memory Reason

Integer aur Float ka memory representation bilkul alag hota hai.

• Integer (18): Binary mein yeh kuch aisa dikhta hai (32-bit):

  $$00000000000000000000000000010010$$

• Float Representation: C mein floats IEEE 754 standard follow karte hain:

  $$\text{Value}=(-1{)}^s\times M\times 2^{E-127}$$

Jab compiler integer $18$ ke binary pattern ko float ke formula mein dalta hai, toh value $0.000000$ ya koi bahut hi ajeeb Garbage Value aati hai, kyunki exponent bits zero hote hain.