In C printf formatting, what is the rounded output for a floating value with one digit after the decimal point? #include <stdio.h> int main() { float a = 3.15529f; printf("%2.1f ", a); return 0; }

Introduction / Context:
This question checks knowledge of printf's floating-point formatting and rounding behavior. The format %2.1f requests exactly one digit after the decimal point, with a minimum field width of 2.

Given Data / Assumptions:

• a = 3.15529.
• Format string is "%2.1f".
• Default rounding of printf for .1 precision is to the nearest representable, commonly half-up behavior for ties once converted to decimal.

Concept / Approach:
Rounding 3.15529 to one decimal place yields 3.2. The width specifier 2 simply sets a minimum field width; it does not truncate digits beyond the requested precision nor suppress the decimal point.

Step-by-Step Solution:
Desired precision = 1 decimal → round 3.15529 to 3.2.Output printed as a fixed-point number with one digit after the decimal → "3.2".

Verification / Alternative check:
Printing with higher precision first (e.g., %.3f) shows 3.155, confirming the next digit is 2, so rounding to one decimal produces 3.2.

Why Other Options Are Wrong:
3.15 has two decimals; 3.00 is over-rounded down; 3 is an integer-like rendering and does not match %.1f formatting.

Common Pitfalls:
Confusing field width with precision, and expecting integer output for %f.

Final Answer:
3.2