Aptitude Test C Programming For Loops

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1. What will be the output of the following C code?
#include <stdio.h>
void main()
{
double k = 0;
for (k = 0.0; k < 3.0; k++);
printf("%lf", k);
}

2.000000

3.000000

1.000000

Run time error

2. Which of the following cannot be used as LHS of the expression in for (exp1;exp2; exp3)?

macros

function

typedef

variable

3. What will be the output of the following C code?
#include <stdio.h>
void main()
{
int k;
for (k = -3; k < -5; k++)
printf("Hello");
}

Hello

Infinite hello

Run time error

Nothing

4. How many times the below loop will be executed?
#include <stdio.h>
int main()
{
int x, y;
for(x=5; x>=1; x--)
{
for(y=1; y<=x; y++)
printf("%d\n",y);
}
}

123451234123121

12345123412345121

123451234512345123451

112123123412345

5. What will be the output of the following C code?
#include <stdio.h>
void main()
{
int k = 0;
for (k < 3; k++)
printf("Hello");
}

Hello is printed thrice

Varies

Nothing

Compile time error

6. What will be the output of the following C code?
#include <stdio.h>
int main()
{
int i = 0;
for (i++; i == 1; i = 2)
printf("In for loop ");
printf("After loop\n");
}

Undefined behaviour

Compile time error

In for loop after loop

After loop

7. What will be the output of the following C code?
#include <stdio.h>
void main()
{
double k = 0;
for (k = 0.0; k < 3.0; k++)
printf("Hello");
}

Hello is printed thrice

Hello is printed infinitely

Run time error

Hello is printed twice

8. What will be the output of the following C code?
#include <stdio.h>
int main()
{
int i = 0;
for (foo(); i == 1; i = 2)
printf("In for loop\n");
printf("After loop\n");
}
int foo()
{
return 1;
}

In for loop after loop

Infinite loop

Compile time error

After loop

9. What will be the output of the following C code?
#include <stdio.h>
void main()
{
int k = 0;
for (k)
printf("Hello");
}

Compile time error

Nothing

Varies

hello

10. What will be the output of the following C code?
#include <stdio.h>
int main()
{
short i;
for (i = 1; i >= 0; i++)
printf("%d\n", i);
}

The control won’t fall into the for loop

Numbers will be displayed until the signed limit of short and throw a runtime error

This program will get into an infinite loop and keep printing numbers with no errors

Numbers will be displayed until the signed limit of short and program will successfully terminate

11. What will be the output of the following C code?
#include <stdio.h>
int main()
{
int i = 0;
for ( ; ; ; )
printf("In for loop\n");
printf("After loop\n");
}

Infinite loop

After loop

Compile time error

Undefined behaviour

12. Which for loop has range of similar indexes of ‘i’ used in for (i = 0;i < n; i++)?

for (i = n; i >= 0; i–)

for (i = n; i>0; i–)

for (i = n-1; i>-1; i–)

for (i = n-1; i>0; i–)

13. What will be the output of the following C code?
#include <stdio.h>
int main()
{
for (int i = 0;i < 1; i++)
printf("In for loop\n");
}

Compile time error

In for loop

Depends on the standard compiler implements

Depends on the compiler

14. What will be the output of the following C code?
#include <stdio.h>
int main()
{
int *p = NULL;
for (foo(); p; p = 0)
printf("In for loop\n");
printf("After loop\n");
}

Compile time error

In for loop after loop

Depends on the value of NULL

Infinite loop

15. The C code ‘for(;;)’ represents an infinite loop. It can be terminated by ___________

terminate

exit(0)

break

abort()

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Aptitude Test C Programming For Loops

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