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C While Loop Interview Questions and Answers
In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from While Loop in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in While Loop to make your MNC interview very easy.
C While Loop Questions
16. What will be the output of the C program?
#include<stdio.h>
int main()
{
int i = 0;
while(;;)
{
printf("Hai Loop");
if (i == 2)
break;
i++;
}
return 0;
}
D. Hai Loop Hai Loop Hai Loop✘
x
Option: B
Explanation
Compilation Error: Expression Syntax Error
17. What will be the output of the C program?
#include<stdio.h>
int main()
{
while(!!7)
printf("Hai");
return 0;
}
A. Hai Hai Hai Hai Hai Hai Hai✘
x
Option: C
Explanation
The condition (!!7) becomes (1). So the while loop condition is always True and loop executed infinitely.
18. What will be the output of the C program?
#include<stdio.h>
int main(){
int i = -1;
do
{
printf("HiDoWhile ");
}while(i++);
return 0;
}
C. HiDoWhile HiDoWhile HiDoWhile✘
x
Option: D
Explanation
The do while loop atleast execute the block once even the condition is false. In the above C program, when it comes first time the loop automatically executes without checking condition and second time it executes because i(post increment) returns -1 and execute it again. In the next iteration the variable i = 0. condition is false.
19. What will be the output of the C program?
#include<stdio.h>
int main(){
while(!printf("Steve is awesome"));
return 0;
}
x
Option: A
Explanation
The while(!printf("Steve is awesome")) will print the string and exit from the loop. i.e) while(!1)
20. What will be the output of the C program?
#include<stdio.h>
int main()
{
int i[3] = {1, 4, 0};
while(i[2] == i[3])
{
if(i[3])
printf("Loop ");
else
break;
}
return 0;
}
x
Option: C
Explanation
The array variable i is allocated to store three integer values.
Note: array index starts from 0. i.e) 0, 1, 2 for the above program. But here we use index i[3] which has default value 0 so condition is true. Then the control flows into while block and if condition will be if(0). Finally else block gets executed.
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