Basic Programming Course Materials & Test Answers | moodle.usthlearningsupport.vn

What happens when this code runs?

    #include <stdio.h>
    int main() {
      int *ptr = malloc(4);
      free(ptr);
      free(ptr);
      return 0;
    }

Undefined behavior

❌

Program runs without issue

0%

Compilation error

0%

Prints a warning

0%

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Which function is used to dynamically allocate memory in C?

malloc()

✅

alloc()

❌

new

❌

memalloc()

❌

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#include <stdio.h>
void main() {
    int a,b;
    a = 100;
    b = 56;
    printf("%d", (a));
What is the output?

56

❌

100

✅✨

Error

❌

Other

❌

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What is the sum of all elements in the following array?

A[2][2] = {{1, -1}, {19, 2}};

21

✅

23

❌

25

❌

19

❌

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Which function type in C allows a function to call itself?

Recursive function

✅

Inline function

❌

Static function

❌

Volatile function

❌

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What is the size of an int in a typical 64-bit system?

2 bytes

❌

4 bytes

✅

Depends on the system

❌

8 bytes

❌

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What is the output of the following C program?

#include <stdio.h>
int main() {
    int a = 10, b = 20;
    printf("%d", a+++b);
    return 0;
}

10

❌

20

❌

30

✅

Error

❌✨

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