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‘C’ Language Aptitude Test Paper




Note : All the programs are tested under Turbo C/C++ compilers.
It is assumed that,
 Programs run under DOS environment,
 The underlying machine is an x86 system,
 Program is compiled using Turbo C/C++ compiler.
The program output may depend on the information based on this assumptions (for example
sizeof(int) == 2 may be assumed).
Predict the output or error(s) for the following:
1. void main()
{
int const * p=5;
printf("%d",++(*p));
}
Answer:Compiler error: Cannot modify a constant value.
Explanation:
p is a pointer to a "constant integer". But we tried to change the value of the "constant
integer".
2. main()
{
char s[ ]="man";
int i;
for(i=0;s[ i ];i++)
printf("\n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]);
}
Answer:
mmmm
aaaa
nnnn
Explanation:
s[i], *(i+s), *(s+i), i[s] are all different ways of expressing the same idea. Generally array
name is the base address for that array. Here s is the base address. i is the index number/displacement from
the base address. So, indirecting it with * is same as s[i]. i[s] may be surprising. But in the case of C it is
same as s[i].

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C++ Programs

#include <iostream.h>
#include <conio.h>

void main()
{
clrscr();
int x = 10;
int y = 2;
int sum, difference, product, quotient;
sum = x + y;
difference = x - y;
product = x * y;
quotient = x / y;
cout << "The sum of " << x << " & " << y << " is " << sum << "." << endl;
cout << "The difference of " << x << " & " << "y << is " << difference << "." << endl;
cout << "The product of " << x << " & " << y << " is " << product << "." << endl;
cout << "The quotient of " << x << " & " << y << " is " << quotient << "." << endl;
getch();
}