C Aptitude Questions and answers with explanation

C Aptitude 27
C program is one of most popular programming language which is used for core level of coding across the board. C program is used for operating systems, embedded systems, system engineering, word processors,hard ware drivers, etc.

The C aptitude questions and answers for those questions along with explanation for the interview related queries.

We hope that this questions and answers series on C program will help students and freshers who are looking for a job, and also programmers who are looking to update their aptitude on C program.
Some of the illustrated examples will be from the various companies, and IT industry experts.

Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

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Predict the output or error(s) for the following:


C aptitude 27.1

 main()
{
    int i;
    i = abc();
    printf("%d",i);
}
abc()
{
    _AX = 1000;
}

Answer: 1000

Explanation: Normally the return value from the function is through the information from the accumulator. Here _AX is the pseudo global variable denoting the accumulator. Hence, the value of the accumulator is set 1000 so the function returns value 1000.

C aptitude 27.2
// If the inputs are 0,1,2,3 find the o/p

  int i;
main()
{
    int t;
    for ( t=4;scanf("%d",&i)-t;printf("%d\n",i))
    printf("%d--",t--);
}

Answer: 4--0 3--1 2--2

Explanation:Let us assume some x= scanf("%d",&i)-t the values during execution will be, t i x 4 0 -4 3 1 -2 2 2 0

C aptitude 27.3

     
int a,b;
func(a,b)

{
    return( a= (a==b) );
}
main()
{
    int process(),func();
    printf("The value of process is %d !\n ",process(func,3,6));
}
int val1,val2;
process(pf,val1,val2)
int (*pf) ();
{
    return((*pf) (val1,val2));
}

Answer:The value if process is 0 !
Explanation: The function 'process' has 3 parameters - 1, a pointer to another function2 and 3, integers. When this function is invoked from main, the following substitutions for formal parameters take place: func for pf, 3 for val1 and 6 for val2. This function returns the result of the operation performed by the function 'func'. The function func has two integer parameters. The formal parameters are substituted as 3 for a and 6 for b. since 3 is not equal to 6, a==b returns 0. therefore the function returns 0 which in turn is returned by the function 'process'.

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