C scanf Quiz Online Practice Test

1. The syntax of the scanf() is scanf("control string", arg1, arg2, arg3, ..., argn); The prototype of the control string is ____________

2. How does the asterisk (*) function in the control string format [=%[*][width][modifiers]type=]?

3. How does `scanf` handle spaces, tabs, and newlines when a user inputs them?

4. What happens if the read and write parameters in a statement are not separated by commas?

5. What is the result of the following C code?
char str[] = "Good";
scanf("%s", str);

6. What is the outcome of this C code?
scanf(" %d %d %d", &n1, &n2);

7. In what format should the data be entered for this C code?
scanf("%d / %d", &n1, &n2);

8. A fatal error occurs if the format string ends with a whitespace character.

9. Which optional argument specifies the maximum number of characters to be read?

10. What will be the value of `i` after executing the following code?
i = scanf("%d %d", &a, &b);

11. What value does `scanf()` return when the user inputs `1 3.2 s` with the following code?
scanf("%d %f %c", &s1, &s2, &s3);

12. What value does `scanf()` return when the user inputs `1 s 3.2` in the following code?
scanf("%d %f %c", &a, &b, &c);

13. What type of error occurs when an incorrect specifier is used for the data type being read?

14. Which of the following represents the correct prototype for the `scanf` function?

15. The control string defines the type and format of data to be input from the keyboard.

16. Which input qualifies for the type specifier `G`?

17. The `scanf()` function is defined in which header file?

18. What does the following C statement indicate?
scanf("%7s", ch);

19. What does the following C statement signify?
scanf("%[^\n]s", ch);