Control Instructions problems
- 1. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int n = 0, y = 1; y == 1? n=0 : n=1; if(n) printf("Yes\n"); else printf("No\n"); return 0; }
Options- A. Error: Declaration terminated incorrectly
- B. Error: Syntax error
- C. Error: Lvalue required
- D. None of above Discuss
Correct Answer: Error: Lvalue required
- 2. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int i = 10, j = 15; if(i % 2 = j % 3) printf("CuriousTab\n"); return 0; }
Options- A. Error: Expression syntax
- B. Error: Lvalue required
- C. Error: Rvalue required
- D. The Code runs successfully Discuss
Correct Answer: Error: Lvalue required
Explanation:
if(i % 2 = j % 3) This statement generates "LValue required error". There is no variable on the left side of the expression to assign (j % 3).
- 3. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int i = 0; i++; if(i <= 5) { printf("CuriousTab\n"); exit(0); main(); } return 0; }
Options- A. The program prints 'CuriousTab' 5 times
- B. The program prints 'CuriousTab' one time
- C. The call to main() after exit() doesn't materialize.
- D. The compiler reports an error since main() cannot call itself. Discuss
Correct Answer: The program prints 'CuriousTab' one time
Explanation:
Step 1: int i = 0; here variable i is declared as an integer type and initialized to '0'(zero).
Step 2: i++; here variable i is increemented by 1(one). Hence, i = 1
Step 3: if(i <= 5) becomes if(1 <= 5) here we are checking '1' is less than or equal to '5'. Hence the if condition is satisfied.
Step 4: printf("CuriousTab\n"); It prints "CuriousTab"
Step 5: exit(); terminates the program execution.
Step 2: i++; here variable i is increemented by 1(one). Hence, i = 1
Step 3: if(i <= 5) becomes if(1 <= 5) here we are checking '1' is less than or equal to '5'. Hence the if condition is satisfied.
Step 4: printf("CuriousTab\n"); It prints "CuriousTab"
Step 5: exit(); terminates the program execution.
Hence the output is "CuriousTab".
- 4. Which of the following statements are correct about the below C-program?
#include<stdio.h> int main() { int x = 10, y = 100%90, i; for(i=1; i<10; i++) if(x != y); printf("x = %d y = %d\n", x, y); return 0; }1 : The printf() function is called 10 times. 2 : The program will produce the output x = 10 y = 10 3 : The ; after the if(x!=y) will NOT produce an error. 4 : The program will not produce output.
Options- A. 1
- B. 2, 3
- C. 3, 4
- D. 4 Discuss
Correct Answer: 2, 3
- 5. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int i = 10, j = 20; if(i = 5) && if(j = 10) printf("Have a nice day"); return 0; }
Options- A. Output: Have a nice day
- B. No output
- C. Error: Expression syntax
- D. Error: Undeclared identifier if Discuss
Correct Answer: Error: Expression syntax
Explanation:
"Expression syntax" error occur in this line if(i = 5) && if(j = 10).
It should be like if((i == 5) && (j == 10)).
- 6. Which of the following sentences are correct about a for loop in a C program?
1: for loop works faster than a while loop. 2: All things that can be done using a for loop can also be done using a while loop. 3: for(;;); implements an infinite loop. 4: for loop can be used if we want statements in a loop get executed at least once.
Options- A. 1
- B. 1, 2
- C. 2, 3
- D. 2, 3, 4 Discuss
Correct Answer: 2, 3, 4
- 7. Which of the following statements are correct about an if-else statements in a C-program?
1: Every if-else statement can be replaced by an equivalent statements using ?: operators 2: Nested if-else statements are allowed. 3: Multiple statements in an if block are allowed. 4: Multiple statements in an else block are allowed.
Options- A. 1 and 2
- B. 2 and 3
- C. 1, 2 and 4
- D. 2, 3, 4 Discuss
Correct Answer: 2, 3, 4
- 8. Which of the following sentences are correct about a switch loop in a C program?
1: switch is useful when we wish to check the value of variable against a particular set of values. 2: switch is useful when we wish to check whether a value falls in different ranges. 3: Compiler implements a jump table for cases used in switch. 4: It is not necessary to use a break in every switch statement.
Options- A. 1,2
- B. 1,3,4
- C. 2,4
- D. 2 Discuss
Correct Answer: 1,3,4
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