C Programming Aptitude Question Set-1 (with output and
justification)
Predict the output of following programs with
justification.
Question - 1
#include<stdio.h>
int main()
{
char
name[ ]="INDIA";
int i;
for(i=0;
name[i]; i++)
printf("%c%c%c
",name[i],*(name+i),*(i+name));
return
0;
}
/*
Output:
III NNN DDD III AAA
Justification: name[i], *(name+i) and *(i+name) are
evaluated to same value.
*/
Question - 2
#include<stdio.h>
int main()
{
int
const marks=5;
printf("%d",marks++);
return
0;
}
/*
Output: Compiler error
Justification: Cannot modify a constant value.
*/
Question - 3
#include<stdio.h>
int main()
{
static int number = 3;
printf("%d ",number--);
if(number)
main();
return 0;
}
int main()
{
static int number = 3;
printf("%d ",number--);
if(number)
main();
return 0;
}
/*
Output:
3 2 1
Justification:
static storage class is initialized once. The value of a
static variable is retained even between the function calls. Main is also
function, which can be called recursively. This main function will be called
until
value of number remains true(i.e. > 0)
*/
Question - 4
int main()
{
float number1 = 5.1;
double number2 = 5.1;
if(number1 == number2)
printf("Equal numbers.");
else
printf("Not equal numbers.");
}
/*
Output:
Not equal numbers.
Justification:
Values of floating point numbers (float, double, long
double) are rounded after its defined precision value. Float takes 4 bytes and long double takes 10 bytes. So
precision(rounded) value of float is different than long double.
Note: Be cautious while using floating point numbers with
relational operators like == , >, <, <=, >= and != .
*/
Question - 5
#include<stdio.h>
int main()
{
char
ch='A';
switch(ch)
{
default
: printf("Error");
case
'A': printf("Hello - A");
break;
case
'B': printf("Hello B");
break;
case
'C': printf("Hello C");
break;
}
}
/*
Output : Hello - A
Justification:
default case can be placed anywhere inside the loop. It
will be executed only when other cases does not match.
*/
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