C program to print the powers of 2 tables for the power 0 to 20, both negative and positive

In this tutorial, we will write a C Program that uses a for loop to print the powers of 2 tables for the power 0 to 20, both positive and negative in C Programming with practical program code and step-by-step full complete explanation.

C Program to print the powers of 2 tables for the power 0 to 20.

 
#include<stdio.h>
#include<conio.h>

void main()
{
    long int p;
    int n;
    double q;

    printf("---------------------------------");
    printf("2 to power n    n   2 to power -n");
    printf("---------------------------------");

    p=1;

    for(n=0;n<21;++n)
    {
        if(n==0)
            p=1;
        else
            p=p*2;
        q=1.0/(double)p;

        printf("%d %d %20.12f",p,n,q);
    }

    printf("-------------------------------");
}

Output

 
------------------------------------------
2 to power n         n      2 to power -n
------------------------------------------
   1                 0      1.000000000000
   2                 1      0.500000000000
   4                 2      0.250000000000
   8                 3      0.125000000000
   16                4      0.062500000000
   32                5      0.031250000000
   64                6      0.015625000000
   128               7      0.007812500000
   256               8      0.003906250000
   512               9      0.001953125000
   1024              10     0.000976562500
   2048              11     0.000488281250
   4096              12     0.000244140625
   8192              13     0.000122070313
   16384             14     0.000061035156
   32768             15     0.000030517578
   65536             16     0.000015258789
   131072            17     0.000007629395
   262144            18     0.000003814697
   524288            19     0.000001907349
   1048576           20     0.000000953674