Solution for Exercise 10-6

ex1006

#include <stdio.h>

void graph(int count);

int main()
{
    int value;

    value = 2;

    while(value<=64)
    {
        graph(value);
        printf("Value is %d\n",value);
        value = value * 2;
    }
    return(0);
}

void graph(int count)
{
    int x;

    for(x=0;x<count;x=x+1)
        putchar('*');
    putchar('\n');
}

Output

**
Value is 2
****
Value is 4
********
Value is 8
****************
Value is 16
********************************
Value is 32
****************************************************************
Value is 64

Notes

* The equation at Line 15 doubles the value of variable value each time the loop is run. Because value starts out equal to 2, you see a graph representing powers of 2.

* It's possible to prototype a function without listing the argument with a variable name, officially known as the parameter name. So you could replace Line 3 with this:

void graph(int);

However, when you write the function in the code (at Line 20), you must specify the parameter name, which then becomes the local variable referencing the passed argument.

Exercise ex1007 →