C For Loop MCQ Questions and Answers

Q. What is the purpose of a 'for' loop in C programming?

To repeat a block of code a fixed number of times
To iterate through a collection of items
To make the program wait for a specified duration
To execute a set of instructions indefinitely
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Q. How do you write a 'for' loop to display the numbers from 1 to 10?

for (int i = 1; i <= 10; i++) {
for (int i = 1; i < 10; ++i) {
for (int i = 1; i <= 10) {
for (int i = 1; i < 11; i++) {
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Q. What is the output of the following code snippet?
<code>for (int i = 1; i <= 5; i++) {
  if (i % 2 == 0) {
    continue;
  }
  printf("%d ", i);
}</code>

1 2 3 4 5
1 3 5
2 4
None of the above
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Q. What is the difference between a 'for' loop and a 'while' loop in C?

'for' loop is used for a fixed number of iterations, while 'while' loop is used for an indefinite number of iterations.
'for' loop uses a pre-test condition, while 'while' loop uses a post-test condition.
'for' loop is faster than 'while' loop.
'while' loop is used for iterating through arrays, while 'for' loop is not.
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Q. How can you iterate through an array using a 'for' loop?

for (int i = 0; i < array_size; i++) {
for (int i = 1; i <= array_size; ++i) {
for (int i = 0; i <= array_size; i++) {
for (int i = 1; i < array_size; i++) {
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Q. What is the output of the following code?
<code>int sum = 0;
for (int i = 1; i <= 5; i++) {
  sum += i;
}
printf("Sum: %d", sum);</code>

Sum: 15
Sum: 10
Sum: 20
Sum: 5
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Q. How can you use a 'for' loop to find the maximum value in an array?

for (int i = 0; i < array_size; i++) {
  if (array[i] > max) {
    max = array[i];
  }
}
for (int i = 0; i < array_size; ++i) {
  max = array[i];
}
for (int i = 0; array[i] < max; i++) {
  max = array[i];
}
for (int i = 0; i < array_size; ++i) {
  if (array[i] > array[i+1]) {
    swap(array[i], array[i+1]);
  }
}
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Q. What is the output of the following code?
<code>for (int i = 1; i <= 5; i++) {
  if (i == 3) {
    break;
  }
  printf("%d ", i);
}</code>

1 2
1 2 3
1 2 3 4 5
1 2 4 5
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Q. How can you use a 'for' loop to print the even numbers from 2 to 20?

for (int i = 2; i <= 20; i++) {
  if (i % 2 == 0) {
    printf("%d ", i);
  }
}
for (int i = 2; i <= 20; i += 2) {
  printf("%d ", i);
}
for (int i = 2; i <= 20; ++i) {
  if (i % 2 != 0) {
    printf("%d ", i);
  }
}
for (int i = 2; i < 20; i += 2) {
  printf("%d ", i);
}
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Q. What is the output of the following code?
<code>int count = 0;
for (int i = 1; i <= 5; i++) {
  for (int j = 1; j <= 3; j++) {
    count++;
  }
}
printf("Count: %d", count);</code>

Count: 15
Count: 3
Count: 5
Count: 1
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Q. What is the output of the following code?
int sum = 0;
for (int i = 1; i <= 5; i++) {
  if (i % 2 == 0) {
    sum += i;
  }
}
printf("Sum of even numbers: %d", sum);

Sum of even numbers: 12
Sum of even numbers: 6
Sum of even numbers: 10
Sum of even numbers: 8
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Q. How can you use a 'for' loop to reverse an array?

for (int i = 0; i < array_size / 2; i++) {
  swap(array[i], array[array_size - i - 1]);
}
for (int i = 0; i < array_size; i++) {
  swap(array[i], array[i + 1]);
}
for (int i = 0; i < array_size; i += 2) {
  swap(array[i], array[array_size - i - 1]);
}
for (int i = 0; i < array_size / 2; i++) {
 &ccccff>   int temp = array[i];
  array[i] = array[array_size - i - 1];
  array[array_size - i - 1] = temp;
}
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Q. What is the output of the following code?
for (int i = 1; i <= 5; i++) {
  if (i % 2 == 0) {
    continue;
  }
  printf("%d ", i);
}

1 3 5
2 4
1 2 3
1 2 3 4 5
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Q. How can you use a 'for' loop to calculate the sum of squares of the first 10 natural numbers?

for (int i = 1; i <= 10; i++) {
  sum += i * i;
}
for (int i = 1; i <= 10; i++) {
  sum = sum + i;
}
for (int i = 1; i <= 10; ++i) {
  sum = sum + i * i;
}
for (int i = 1; i < 10; i++) {
  sum += i;
}
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Q. What is the output of the following code?
int count = 0;
for (int i = 1; i <= 5; i++) {
  for (int j = 1; j <= 3; j++) {
    if (j % 2 == 0) {
      count++;
    }
  }
}
printf("Count: %d", count);

Count: 5
Count: 3
Count: 8
Count: 1
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Q. How can you use a 'for' loop to find the minimum value in an array?

for (int i = 0; i < array_size; i++) {
  if (array[i] < min) {
    min = array[i];
  }
}
for (int i = 0; i < array_size; i++) {
  min = array[i];
}
for (int i = 0; array[i] > min; i++) {
  min = array[i];
}
for (int i = 0; i < array_size; i++) {
  if (array[i] < array[i+1]) {
    swap(array[i], array[i+1]);
  }
}
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Q. What is the output of the following code?
for (int i = 1; i <= 5; i++) {
  if (i == 4) {
    break;
  }
  printf("%d ", i);
}

1 2 3
1 2 3 4
1 2 3 4 5
1 2
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Q. How can you use a 'for' loop to print the odd numbers from 1 to 15?

for (int i = 1; i <= 15; i++) {
  if (i % 2 == 0) {
    printf("%d ", i);
  }
}
for (int i = 1; i <= 15; i += 2) {
  printf("%d ", i);
}
for (int i = 1; i <= 15; ++i) {
  if (i % 2 != 0) {
    printf("%d ", i);
  }
}
for (int i = 1; i < 15; i += 2) {
  printf("%d ", i);
}
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