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this is the question:
Write a C program that will request the user to input the values for R,L,and C and plot the a graph of current ,I, against frequency . The range for the frequency axis should be automatically selected based on the resonance frequency of the circuit.

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Last Post by Mouche
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And? What have you tried? Please note that our rules disallow posting homework questions with no proof of effort as if you wanted us do write it for you.

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here is my coding

#include<stdio.h>
#include<math.h>
#define pi 3.142

double current(double);
double frequency(double,double);

void main ()
{
    double r,l,c,i;
    double f;
    printf("Enter the value of R(unit in ohm):\n");
    scanf("%lf",&r);
    printf("Enter the value of L(unit in henry):\n");
    scanf("%lf",&l);
    printf("Enter the value of C(unit in farad):\n");
    scanf("%lf",&c);
    i=current(r);
    printf("the value of I,current:%f ampere\n",i);
    f=frequency(l,c);
    printf("the value of f,frequency:%f hertz\n",f);
}

double current(double r)
{
    double v=240;
    double i;
    i=v/r;
    return i;
}

double frequency(double l,double c)
{
    double f=0.0;
    double s=0.0,result;
    s=l*c;
    result=sqrt(s);
    f=1/(2*pi*result);
    return f;
}

my problem is how to plot the graph?

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Assuming this is for a class, did your professor use or recommend a plotting library?

If not, you could do a rough graph in ASCII like this:

     5        #     
     4        ##     
 I   3        ##     #
(mA) 2        ##     #
     1        ##     #
     0 ################
       0     500     1k
           Freq (Hz)

You would just have to come up with some math to simplify the data to individual ASCII blocks.

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