#2) C Programming practice Questions- operators, if-else, loops, switch-case

C programming practice questions focused on operators, if-else, loops, and switch-case.

🔹 Operators

1. What will be the output of the following code?

   int a = 5, b = 2;  
   printf("%d", a / b);  
   

2. Predict the result:

   int x = 10;  
   x += 5 * 2;  
   printf("%d", x);  
   

3. What will be stored in c?

   int a = 5, b = 3;  
   int c = a % b;  
   

4. Evaluate:

   int x = 2, y = 3;  
   printf("%d", x && y);  
   

5. Which operator has higher precedence: * or +?
6. Write an expression using ternary operator to find the maximum of two numbers a and b.

7. Find the output:

   int a = 4;  
   printf("%d %d", a++, ++a);  
   

8. What will be the output?

   int x = 5;  
   printf("%d", x > 3 && x < 10);  
   

9. Predict:

   int x = 0;  
   printf("%d", !x);  
   

10. If a = 2, b = 3, c = 4, evaluate:

    a += b *= c;  
    printf("%d %d %d", a, b, c);  
    

🔹 If-Else

1. Write a program to check if a number is even or odd using if-else.

2. Predict the output:

   int x = 10;  
   if (x = 0)  
       printf("Yes");  
   else  
       printf("No");  
   

3. Write a program to find the largest of three numbers using nested if-else.

4. Given int x = -5;, what will this print?

   if (x)  
       printf("True");  
   else  
       printf("False");  
   

5. What is the output?

   int a = 10;  
   if (a > 5)  
       if (a > 15)  
           printf("Hello");  
       else  
           printf("World");  
   

6. Write a program using if-else to check whether a character is a vowel or consonant.

7. Fix the error:

   if (x > 5);  
       printf("Greater");  
   

8. Write a program to check whether a number is positive, negative, or zero.

🔹 Loops

1. Write a program to print numbers from 1 to 10 using a for loop.
2. Write a program to print the sum of first 100 natural numbers using a while loop.

3. Predict the output:

   int i = 0;  
   while (i < 5) {  
       printf("%d ", i);  
       i++;  
   }  
   

4. What is the output?

   int i = 1;  
   do {  
       printf("%d ", i);  
       i++;  
   } while (i < 3);  
   

5. Write a program to print the multiplication table of 5.
6. Write a program to find the factorial of a number using a loop.

7. Predict the output:

   for (int i = 0; i < 5; i++);  
       printf("Hello");  
   

8. Write a program to print even numbers from 1 to 20 using a for loop.
9. Write a program to reverse a number (e.g., input 1234 → output 4321).

10. What is the output?

    int i;  
    for (i = 1; i <= 10; i++) {  
        if (i == 5)  
            break;  
        printf("%d ", i);  
    }  
    

11. What will this print?

    for (int i = 1; i <= 5; i++) {  
        if (i == 3)  
            continue;  
        printf("%d ", i);  
    }  
    

🔹 Switch-Case

1. Write a program using switch to check the day of the week (1 = Monday, …, 7 = Sunday).

2. What is the output?

   int x = 2;  
   switch (x) {  
       case 1: printf("One"); break;  
       case 2: printf("Two");  
       case 3: printf("Three"); break;  
       default: printf("Other");  
   }  
   

3. Write a switch program to check whether a given character is a vowel (a, e, i, o, u).

4. Predict:

   int x = 4;  
   switch (x) {  
       default: printf("Default");  
       case 4: printf("Four");  
   }  
   

5. Can a switch statement work with float values? Why or why not?
6. Write a program using switch to perform a basic calculator (addition, subtraction, multiplication, division).