- Control Instructions - General Questions
- Control Instructions - Find Output of Program
- Control Instructions - Point Out Errors
- Control Instructions - Point Out Correct Statements
- Control Instructions - True / False Questions
- Control Instructions - Yes / No Questions


Control Instructions - Programming
Q1: What will be the output of the program?
#include<stdio.h>
int main()
{
unsigned int i = 65536; /* Assume 2 byte integer*/
while(i != 0)
printf('%d',++i);
printf('\n');
return 0;
}
A Infinite loop
B 0 1 2 ... 65535
C 0 1 2 ... 32767 - 32766 -32765 -1 0
D No output
ANS:A - Infinite loop
Here unsigned int size is 2 bytes. It varies from 0,1,2,3, ... to 65535.
Step 1:unsigned int i = 65536; here variable i becomes '0'(zero). because unsigned int varies from 0 to 65535.
Step 2: while(i != 0) this statement becomes while(0 != 0). Hence the while(FALSE) condition is not satisfied. So, the inside the statements of while loop will not get executed.
Hence there is no output.
Note: Don't forget that the size of int should be 2 bytes. If you run the above program in GCC it may run infinite loop, because in Linux platform the size of the integer is 4 bytes.
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