C Coding Test and C Programming Test: Your Complete Guide to Acing It in 2025
if you are searching for c coding test then friends you are on correct blog article so this helps you to strong your basics and Also Helps Clear Your fundamental concepts of C programming.
In this article friends you will get:
1.I have provided 11 real C coding test questions with answers and explanations
2.I have covered fundamental in This C programming tests
3. Practice tips to improve your score fast
C Coding Test Questions and Answers
Here i have provided some of the most common and useful questions you’re likely to see on a real-world C programming test
Question 1:Tell the Output of following Code (Post/Pre Increment)
#include <stdio.h>
int main() {
int a = 5;
printf("%d %d %d", a++, ++a, a);
return 0;
}
A) 5 7 8
B) 5 6 7
C) Undefined behavior
D) Syntax error
Answer: C) Undefined behavior
Explanation: Modifying and accessing the same variable multiple times without a sequence point results in undefined behavior in C.
Question 2:here second question on a Pointer Arithmetic
#include <stdio.h>
int main() {
int arr[] = {10, 20, 30, 40};
int *ptr = arr;
printf("%d\n", *(ptr + 2));
return 0;
}
Answer: 30
Explanation: ptr + 2 points to the third element of the array, which is 30.
Question 3:Here 3rd question on Memory Allocation
Which function is used to allocate memory dynamically in C?
A) malloc
B) alloc
C) calloc
D) A and C
Answer: D) A and C
Explanation: Both malloc and calloc are used for dynamic memory allocation in C.
Question 4:here a question on a Function Output
#include <stdio.h>
int add(int a, int b) {
return a + b;
}
int main() {
printf("%d\n", add(3, 4));
return 0;
}
Answer: 7
Explanation: This is the simple question on The function that returns the sum of 3 and 4.
Question 5: Now Solve this question on String Manipulation
#include <stdio.h>
#include <string.h>
int main() {
char str[20] = "Hello";
strcat(str, "World");
printf("%s\n", str);
return 0;
}
Answer: HelloWorld
Explanation: strcat appends the second string to the first.
Question 6:Can You figure out this Loop Logic
What is the output?
#include <stdio.h>
int main() {
for (int i = 0; i < 5; i++) {
if (i == 3)
break;
printf("%d ", i);
}
return 0;
}
Answer: 0 1 2
Explanation: Here The loop breaks when i equals 3, so only 0, 1, and 2 are printed.
Question 7:Tell the Sizeof Operator
#include <stdio.h>
int main() {
int arr[10];
printf("%lu", sizeof(arr));
return 0;
}
Answer: 40 (on most systems)
Explanation: int has 4 byte of size and we store 10 integers in array so =10 integers \* 4 bytes = 40 bytes. May vary depending on your system or compiler.
Question 8: question on Null Pointer
#include <stdio.h>
int main() {
int *ptr = NULL;
printf("%p", ptr);
return 0;
}
Answer: 0x0 or (nil)
Explanation: A null pointer is printed as 0x0 or (nil) depending on the system.
Question 9: Solve this Question on a Recursive Function
#include <stdio.h>
int fact(int n) {
if (n == 0) return 1;
return n * fact(n - 1);
}
int main() {
printf("%d", fact(4));
return 0;
}
Answer: 24
Explanation: The recursive function calculates 4! = 4 × 3 × 2 × 1 = 24.
Question 10:Solve this question on a Structure Usage
#include <stdio.h>
struct Point {
int x, y;
};
int main() {
struct Point p = {3, 4};
printf("%d %d", p.x, p.y);
return 0;
}
Answer: 3 4
Explanation: This is a basic example of struct initialization and access.
Question 11:here question on Array Indexing
#include <stdio.h>
int main() {
int arr[] = {1, 2, 3};
printf("%d", 2[arr]);
return 0;
}
Answer: 3
Explanation: In C programming we have to know that, arr\[2] is equivalent to 2\[arr] because of pointer arithmetic.
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