You want to write a C function that returns the index of the first prime number in an array, or -1 if none found. Which code snippet correctly uses return inside a loop to achieve this?

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C - Loop Control Statements

You want to write a C function that returns the index of the first prime number in an array, or -1 if none found. Which code snippet correctly uses return inside a loop to achieve this?

for(int i=0; i<n; i++) {
  if(isPrime(arr[i]))
    return i;
}
return -1;

for(int i=0; i<n; i++) {
  if(isPrime(arr[i]))
    break;
  return i;
}
return -1;

for(int i=0; i<n; i++) {
  if(isPrime(arr[i]))
    return -1;
}
return i;

for(int i=0; i<n; i++) {
  if(isPrime(arr[i]))
    continue;
  return i;
}
return -1;

Step-by-Step Solution

Solution:

Step 1: Understand the goal
We want to return the index of the first prime number found, or -1 if none.
Step 2: Analyze each option's logic
for(int i=0; i
Final Answer:
for(int i=0; i -> Option A
Quick Check:
Return index on first prime, else -1 after loop [OK]

Quick Trick: Return inside loop on condition, return default after loop [OK]

Common Mistakes:
Returning wrong value inside loop
Using break without return
Returning default inside loop

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You want to write a C function that returns the index of the first prime number in an array, or -1 if none found. Which code snippet correctly uses return inside a loop to achieve this?

Step 1: Understand the goal

Step 2: Analyze each option's logic

Final Answer:

Quick Check:

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