Aptitude Questions and answers with explanation

C Aptitude 11
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The C aptitude questions and answers for those questions along with explanation for the interview related queries.

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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.

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

C aptitude 11.1

   main()
{
int i=1;
while (i<=5)
{
printf("%d",i);
if (i>2)
goto here;
i++;
}
}
fun()
{
here:
printf("PP");
}

Answer: Compiler error: Undefined label ‘here’ in function main

Explanation: Labels have functions scope, in other words The scope of the labels is limited to functions . The label ‘here’ is available in function fun() Hence it is not visible in function main.

C aptitude 11.2

   main()
{
static char names[5][20]={"pascal","ada","cobol","fortran","perl"};
int i;
char *t;
t=names[3];
names[3]=names[4];
names[4]=t;
for (i=0;i<=4;i++)
printf("%s",names[i]);
}

Answer: Compiler error: Lvalue required in function main

Explanation:Array names are pointer constants. So it cannot be modified.

C aptitude 11.3

    void main()
{
int i=5;
printf("%d",i++ + ++i);
}

Answer: Output Cannot be predicted exactly.

Explanation: Side effects are involved in the evaluation of i

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