In C, evaluate nested assignments and function calls: what does this program print for k? #include<stdio.h> int func1(int); int main() { int k = 35; k = func1(k = func1(k = func1(k))); printf("k=%d ", k); return 0; } int func1(int k) { k++; return k; }

Introduction / Context:
This classic C puzzle checks understanding of nested function calls, right-associative assignments, and the fact that assignment is an expression whose value is the assigned value. The helper function increments its argument and returns the incremented value.

Given Data / Assumptions:

• int func1(int k) { k++; return k; } increments and returns its input.
• Initial k = 35.
• Compound statement: k = func1( k = func1( k = func1(k) ) );
• Standard C semantics; each inner expression must be fully evaluated to supply the argument to the next call.

Concept / Approach:
Work from the innermost parentheses outward. Each func1 call adds 1 to its argument and returns that value. Each k = ... not only stores into k but also yields that stored value, which then becomes the argument to the next outer call.

Step-by-Step Solution:
Start k = 35.Innermost: func1(k) = 36; assign k = 36.Middle: need k = func1(k): with k = 36, func1(36) = 37; assign k = 37; the middle call is func1(37) = 38; then the middle assignment sets k = 38.Outer: evaluate func1(38) = 39; final outer assignment sets k = 39.Prints “k=39”.

Verification / Alternative check:
Replace nested form with sequential statements to verify: k=func1(k); k=func1(k); k=func1(k); would give 38; however the given expression performs an extra func1 due to the outer call applied to the already-assigned middle result, hence 39.

Why Other Options Are Wrong:
“k=38” overlooks that the outermost func1 runs after the middle assignment has already set k to 38. “k=35/36/37” ignore one or more increments.

Common Pitfalls:
Forgetting that an assignment returns the assigned value; miscounting the number of func1 calls; assuming chained comparisons or left-to-right argument evaluation semantics that do not apply to nested expressions.

Final Answer:
k=39