In C, what will this program print? Note the comma operator in the function and the space in printf.
#include
int addmult(int ii, int jj)
{
int kk, ll;
kk = ii + jj;
ll = ii * jj;
return (kk, ll);
}
int main()
{
int i=3, j=4, k, l;
k = addmult(i, j);
l = addmult(i, j);
printf("%d %d
", k, l);
return 0;
}
-
A12 12
-
BNo error, No output
-
CError: Compile error
-
DNone of above
-
E7 12
Answer
Correct Answer: 12 12
Explanation
Introduction / Context:This is the same comma-operator behavior as an earlier problem but with a different printf format (space-separated). The function returns the product because the comma operator yields the right-hand operand’s value.
Given Data / Assumptions:
- i = 3, j = 4 → sum 7, product 12.
- return (kk, ll) → returns 12.
- printf prints two integers separated by a space.
Concept / Approach:The comma operator evaluates left expression, discards it, then evaluates right expression and returns that value. So addmult returns 12. Both assignments to k and l receive 12.
Step-by-Step Solution:kk = 3 + 4 = 7, ll = 3 * 4 = 12.return (kk, ll) → returns 12.k = 12, l = 12.printf prints: "12 12".
Verification / Alternative check:Replace return (kk, ll) with return ll; compile and run; the output remains "12 12".
Why Other Options Are Wrong:There is no compile error; the comma operator is legal. The program clearly outputs, so “No error, No output” is false. “None of above” contradicts the trace.
Common Pitfalls:Assuming both values are printed (7 and 12); only the returned value is assigned each time.
Final Answer:12 12