CODEWITHSUNDEEP
c
user3238099
user3238099

Reputation: 19

What is the correct way to use the WHILE LOOP in the following code?

Q. Write a program that reads a positive integer and then finds the smallest power of 2 that is greater than or equal to the number that was read. For example, if the program reads the value of 25, it should note that 32 = 2^5 is the smallest power of two greater than or equal to 25.

My approach:

**

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int num1, n;
    int num2 = 2^n;
    printf("Please type in num1: ");
    scanf("%d", &num1);
    n = 0;
    while (num1 > num2)
    {
        n=n+1;
    }
    printf("The power value is %d", n);
    return (0);
}

** I am still a beginner so......

Upvotes: 0

Views: 699

Answers (2)

Ahmed
Ahmed

Reputation: 59

  1. try this is algorithm is fast 

    int a, b = 1;
printf("Enter no \n");
scanf("%d",&a);
while (a >= b)
{
    b  = b << 1 ;
}
printf("%d",b);

Upvotes: 0

abelenky
abelenky

Reputation: 64730

When your loop starts, num1 has some specific value, and num2 has another value.

Everytime through the loop, you do not change either value.
So the expression will stay true forever, and the loop will keep running forever, never exiting!

If you want the loop to end eventually, you must change the expression of the loop in some way!
You should modify the value of num1 or num2 inside your loop.

Upvotes: 1

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