If-Else Statements
What is the purpose of an if-else statement in C?
To execute a block of code based on whether a condition evaluates to true or false.
What is an array in C programming?
An array is a collection of elements of the same data type, stored in contiguous memory locations.
What is the basic structure of a for loop in C?
for (initialization; condition; update) { // code }
How do you declare a function in C that returns an integer?
int functionName();
What data types can be used in the condition of an if-else statement?
Conditions generally use integer or boolean values. In C, non-zero values are true, and zero is false.
How do you declare an integer array named num of size 5 in C?
int num[5];
What is the difference between a while loop and a do-while loop?
A while loop checks the condition before executing the loop body, while a do-while loop executes the loop body at least once before checking the condition.
What is a function in C programming?
A function is a block of code that performs a specific task, can be called multiple times, and may return a value.
int x = 5; if (x < 10 && x > 10) printf("Small\n"); else printf("Big\n");
Big
What will be the output of the following code?
int arr[] = {10, 20, 30}; printf("%d", arr[1]);
20
What will be the output of this code?
int i = 0;
while (i < 3) { printf("%d ", i); i++; }
0 1 2
What is the syntax for declaring a function in C?
return_type function_name(parameter_list) {
// function body
return value
}
What does this code print if the user inputs 90?
int score;
scanf("%d", &score);
if (score >= 90) printf("A");
else if (score >= 80) printf("B");
else printf("C");
A
Write a program that calculates the sum of elements in an integer array.
int arr[5] = {1, 2, 3, 4, 5};
int sum = 0;
for (int i = 0; i < 5; i++) sum += arr[i];
printf("%d", sum);
Write a program using a loop to print the first 10 natural numbers.
for (int i = 1; i <= 10; i++) {
printf("%d ", i);
}
Write a function add(int a, int b) that returns the sum of two integers.
int add(int a, int b) { return a + b; }
Write a program to check if a number is even or odd using the if-else statement.
int num;
printf("Enter a number: ");
scanf("%d", &num);
if (num % 2 == 0) printf("Even\n");
else printf("Odd\n");
How do you find the largest number in an array of size 10?
int arr[10] = {1, 3, 5, 7, 9, 2, 4, 6, 8, 0};
int max = arr[0];
for (int i = 1; i < 10; i++) {
if (arr[i] > max) max = arr[i];
}
printf("Largest: %d", max);
What is the output of the following code?
int x = 5;
do {
printf("%d ", x);
x--;
} while (x > 0);
5 4 3 2 1
Write a C function that takes a single integer as input, squares it, and returns the result.
int square(int num) { return num * num; }