FREE Bachelor of Computer Engineering C Language Questions and Answers
Which of the following is a name for a C variable that is invalid?
An error occurs because only underscore and no other special characters are permitted in variable names.
Which C expression is legitimate?
A variable name cannot contain a space, comma, or the symbol $.
Who is the C language's father?
The father of the C programming language is Dennis Ritchie. At the United States' American Telephone & Telegraph Bell Laboratories, the C programming language was created in 1972.
What will the following C expression's value be? (x = foo()) ! = 1 assuming that foo() yields 2
The sub-expression "x = foo()" in the C programming language will give the variable "x" a value of 2. The result will be 1 as a result of the subsequent check to see whether this value is not equal to 1.
Which of the following declarations does the C language not support?
In Java it is acceptable, but in C it is not.
The ________ symbol is used to specify the C-preprocessors.
The # sign is used to specify C-preprocessors.
Which keyword is used in a C program to stop a variable from changing at all?
In a C program, the keyword constant is const.
In the header file, there is a predefined function called scanf().
The "stdio.h" header file has a predefined function called scanf(). Input and output operations are performed by printf and scanf() in C. The header file stdio.h contains these function statements.
What is the name of the C property that enables the creation of several executables for various platforms?
The preprocessor feature known as conditional compilation allows for the creation of various executables.
Which statement regarding variable names in C is accurate?
It cannot begin with a digit, per the convention for C variable names.
What one of the following is untrue?
If a variable is declared but not defined, it is not a mistake. Extern declarations, for instance.
What will the following C code produce as its output?
Redefining y causes an error because it has already been defined.
Output:
$ cc pgm2.c
pgm2.
c: In function ‘main’:
pgm2.
c:5: error: redefinition of ‘y’
pgm2.
c:4: note: previous definition of ‘y’ was here
Which conversion type is not permitted?
A float cannot be converted to a pointer type.
Which keyword is used in a C program to stop a variable from changing at all?
In a C program, the keyword constant is const.
What will the following C code produce as its output?
A const type value cannot be altered.
Output:
$ cc pgm1.c
pgm1.c: In function ‘foo’:
pgm1.c:13: error: assignment of read-only location ‘*i’
What will the following C code produce as its output?
The variable x is given a value of zero in the C code above. We are giving x a new value of zero in the if condition. Keep in mind that we are "NOT" comparing the values to zero (you can see that there is only one "=" symbol, not two "==" signs). As a result, the else condition's printf() function is called, causing "Its not zero" to be shown and the if condition to become false.