CODEWITHSUNDEEP
cloopswhile-loopinfinite-loopdo-while
user15999974
user15999974

Reputation:

Why this is an infinite loop?

Why the loop goes on to infinity , I have put limits via n<6 , one more thing , the code prints 111111... . The output that I expect is 12345.

#include <stdio.h>

//Compiler version gcc  6.3.0

int main()
{
  int n=1;
  do{
    while(n<6)
    printf("%d",n);
    n++;
  }
  while(n<6);

  return 0;
}

Upvotes: 0

Views: 77

Answers (3)

Danielgard
Danielgard

Reputation: 55

The right code should be:

#include <stdio.h>

//Compiler version gcc  6.3.0

int main()
{
  int n=1;
  do{
    printf("%d",n);
    n++;
  }
  while(n<6);

  return 0;
}

In addition, I find no reason to use a do-while statement. A simple while would make the work:

int n=1
while(num<6)
{
  printf("%d",n);
  num++;
}

Also, for a known length of inputs, it is more right to use a for loop.

Upvotes: 0

Caius Jard
Caius Jard

Reputation: 74615

Why this is an infinite loop?

Because this:

do{
    while(n<6)
    printf("%d",n);
    n++;
}
...

Is actually this:

do{
    while(n<6) {
        printf("%d",n);
    }
    n++;
}
...

The code will never escape the "single statement while loop" just under the do. I would suggest that deleting it so that you only have one line that says while(n<6), just above the return, will make your program function as you expect

enter image description here

Upvotes: 6

0___________
0___________

Reputation: 67584

Becuase in this loop only one statement is executed.

    while(n<6)
       printf("%d",n);

It is same as:

while(n<6)
{
   printf("%d",n);  
}

You enter this loop when n == 1 which meets the loop condition condition

Upvotes: 0

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