C programming

An electric power distribution company charges its domestic consumers as follows:

 Consumption Units   Rate of Charge

 0-200     Rs.0.50 per unit

 201-400  Rs.100 plus Rs.0.65 per unit excess 200

 401-600  Rs.230 plus Rs.0.80 per unit excess of 400.

Write a C program that reads the customer number and power consumed and prints the amount to be paid by the customer. [Nov./Dec.-2005,Set-3, Unit-1, Q.No.-34]

Ans. : */

#include<stdio.h>

#include<conio.h>

void main()

{

int n, p;

float amount;

clrscr();

printf("Enter the customer number: ");

scanf("%d",&n);

printf("Enter the power consumed: ");

scanf("%d",&p);

if(p>=0 && p<=200)

 amount=p*0.50;

else if(p>200 && p<400)

 amount = 100+((p-200) * 0.65);

else if(p>400 && p<=600)

 amount = 230 + ((p-400) * 0.80);

printf("Amount to be paid by customer no. %d is Rs.:%5.2f.",n,amount);

getch();

}





Write a program to read the values of x, y and z and print the results of the following expressions in one line.


Ans. :
#include<stdio.h>
#include<conio.h>
void main()
{
int x,y,z;
float a,b,c;
clrscr();
printf("Enter the values of x,y and z : ");
scanf("%d%d%d",&x,&y,&z);
a=(x+y+z)/(x-y-z);
b=(x+y+z)/3;
c=(x+y)*(x-y)*(y-z);
printf("a = %f\tb = %f\tc = %f",a,b,c);
getch();
}



Write a program to read a text file and convert the file contents  in capital (Upper-case) and write the contents in a output file.

Ans. :
Program to copy the contents of one file into another*/
#include<stdio.h>
#include<process.h>

 void main()
  {
FILE *fp1,*fp2;
char a;
clrscr();
fp1=fopen("d:\\dtp\\test.txt","r");
if(fp1==NULL)
 {
 puts("cannot open this file");
 exit(1);
 }
fp2=fopen("d:\\dtp\\test1.txt","w");
if(fp2==NULL)
 {
 puts("Not able to open this file");
 fclose(fp1);
 exit(1);
 }
 do
  {
  a=fgetc(fp1);
  a=toupper(a);

  fputc(a,fp2);
  }
  while(a!=EOF);
  fcloseall();
  getch();
}


Write a program to copy the contents of one file into another. [June-2005, Set-4, Unit-5, Q.No.-2]


Ans. :
Program to copy the contents of one file into another*/
#include<stdio.h>
#include<process.h>

 void main()
  {
FILE *fp1,*fp2;
char a;
clrscr();
fp1=fopen("d:\\dtp\\test.txt","r");
if(fp1==NULL)
 {
 puts("cannot open this file");
 exit(1);
 }
fp2=fopen("d:\\dtp\\test1.txt","w");
if(fp2==NULL)
 {
 puts("Not able to open this file");
 fclose(fp1);
 exit(1);
 }
 do
  {
  a=fgetc(fp1);
  fputc(a,fp2);
  }
  while(a!=EOF);
  fcloseall();
  getch();
}

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