Question

C programming - This is what I have so far but it is not working correctly. It must contain the function and it also needs a provision to write output to a file. Can anyone help?

#include <stdio.h> I #include <math.h int main (void) int V float Rint, RLE0, 0; printf New power supply voltage scanf ("td", &V) printf Enter a valid Internal Resistance (Rint) range between 200 and 5k ohms: scanf ("tf", Rint if (V> 1 && VK 15) if (Rint 200 & & Rint< 5000) RL 100 p Cal Pow (V, Rint, RL printf Maximum power transferred to RL is tf", p) else printf ("Entered Values are invalid in the range") return 0; void Cal W (int V float Rint, float RL) Po float i,p; for i Rint: i< RL: i i 1 p (V 2) /i; Power Power\n") printf RL RLAn") printf tf\n", RL, Rint, i, p) printf ("tf return p;

Answer 1

//The file will get created once you run this code.

#include<stdio.h>
#include<math.h>

float calPow(int V, float Rint, float RL)
{
   FILE *file = fopen("Rint.txt", "ab+");       //i am creating a file if doesnt exist, if exist then it will just append data
   float i,p;
   if (file)
   {
       for(i=RL;i<Rint;i++)       // Rl = Rint-100, so we should begin from RL till it reaches Rint value
       {
           p = pow(V,2)/i;      
           //printf("\nRL Rint Power Power");
           //printf("\nn Rint RL");
           fprintf(file, "\n%.2f %.2f %.2f %.2f",RL,Rint,i,p);   // printing all the data to a file.      
       }
       fclose(file);   //closing the file
   }
   return p;   //returning last p value to where the function call occurs
}

int main( ) //i just removed void, because if you use void you dont need to return
{
   int V;
   float Rint,RL=0,p=0;
   printf("\nNew power supply voltage: ");
   scanf("%d",&V);
   printf("\nEnter a valid internal resistance (Rint) range between 200 and 5k ohms: ");
   scanf("%f",&Rint);
   if(V>=1 && V<=15)
   {
       if(Rint>=200 && Rint<=5000)
       {
           RL = Rint-100;
           p = calPow(V,Rint,RL);       //here you are getting some value from calPow and assigning to float variable. Then the function should be float
           printf("\nMaxmimul power transferred to RL is : %f\n",p);
       }
       else
           printf("\nEntered values of Rint are invalid in the range");
   }
   else
       printf("\nEntered values of V is not valid in the range");
   return 0;
}

agilaa@agilaa: /Desktop/pro/c E 四 口(3896) 4)) * 10:57 AM agilaa@agilaa:-/Desktop/pro/C$ gcc rint.co rint /tmp/ccxtD67X.o In function calPow: rint.c:(.text+0x51): undefined reference to pow' collect2: error: ld returned 1 exit status agilaa@agilaa:-/Desktop/pro/C$ gcc rint.c -o rint -lm agilaa@agilaa:-/Desktop/pro/C$/rint New power supply voltage: 5 Enter a valid internal resistance (Rint) range between 200 and 5k ohms: 2000 Maxminul power transferred to RL is : θ,012506 agilaagagilaa:~/Desktop/pro/cs

Rint.txt (-/Desktop/pro/C) -gedit E ES )(37%) ») 10:59 AM * Save 0 1900 . 2000-00 2000-00 2000-00 2000-00 2000.060 2000-00 2000.00 2000-00 2000.00 2000·00 2000.00 2000-00 2000.060 2000-00 2000.00 2000·00 2000.00 2000·00 2000-00 2000·00 2000.060 2000-00 2000.00 2000-00 2000.00 2000·00 2000-00 2000-00 2000.060 2000-00 2000.00 2000·00 2000.00 2000-00 2000.00 1 900 . 1901 . θθ 1902. 1900 . 1900 . 1905 , θθ 1 906 . θθ 1900 . 1908 . θθ 1989 . θθ 1900 . 1911.00 1912.060 1913.00 1900 . 1900 . 1915.00 1900 . 1917.00 1900 . 1919.00 1920.00 1921 . θθ 1900 . 1900 . θθ 1923, θθ 1924. 1925, θθ 1926.00 1927, θθ 1900 . 1900 . 1900 . θθ 1929 . θθ 1930.00 1931 . θθ 1932. 1933 , θθ 1934. 1900 . 1900 . Plain Text Tab Width: 8 INS