program to get values in of x in quadratic equation

//program to get values of x in quadratic equation
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
float a,b,c,x1,x2;
printf("enter values of a,b and c\n");
scanf("%f%f%f",&a,&b,&c);
x1=(-b+sqrt(b*b-4*a*c))/2*a;
x2=(-b-sqrt(b*b-4*a*c))/2*a;
printf("the first value=%f\n",x1);
printf("second value is=%f",x2);
getch();
}

note:

according to formula the condition should be satisfied.like
1) (b²-4ac)>0 i.e. b²>4ac
2)a>0 for 2a
otherwise the program terminates abnormally without any result.
later we will see this program with 'if' structure'.

Logically that is said to be right.

program to get total and percentage of a student

// program to get total and percentage of a student

#include<stdio.h>

#include<conio.h>
#include<math.h>

void main()

{

int english,maths,physics,chemistry;
float total,percentage;

printf(“enter marks of different subjects \n”);

scanf(“%d%d%d%d”,&english,&maths,&physics,&chemistry);

total=english+maths+physics+chemistry;
percentage=(float)total/4; //called type casting to convert total/4 into floating value

printf(“the total marks is=%f\ and percentage=%f\n”,total,percentage);

getch();
}

note:
you can also use like,
percentage=(float)(total/4);
 or
percentage=float(total/4);
you get same output.

program to get value of f(x)

// program to get value of f(x)=x²+2x+3

#include<stdio.h>

#include<conio.h>
#include<math.h>

void main()

{

float x,f_x;

printf(“enter x \n”);

scanf(“%f”,&x);

f_x=(pow(x,2)+2*x+3); //pow() function exists inside math.h

printf(“the result is=%f\n”,f_x);

getch();
}

input and output programs

continued.......

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P19)write a program to get value of  f(x)=x²+2x+3.Here, x is a variable.
                                                                                                                  solution
P20)Write a program to get total and percentage of a student whose marks in different subjects are given below.
                                                                                                       

subjects	marks
english	45
maths	65
physics	45
chemistry	45

                                                                                                                   solution

P21)Write a program to get value of quadratic equation ax²+bx+c.Here, symbols have as usual meaning. (use simple method)                                                              
                                                                                                                   solution

P22)Write a program to convert number of days into year,months and days.
                                                                                                                    solution

P23)Write a program to convert number of seconds into hour,minutes and seconds.
                                                                                                                    solution

P24)write a program to know ascii value of entered character.
                                                                                                                    solution
                                                                                                               

program to get value of expression y raised to power of x

// program to get value of x^y

#include<stdio.h>

#include<conio.h>
#include<math.h>

void main()

{

float x,y;

float result;

printf(“enter x and y\n”);

scanf(“%f%f”,&x,&y);

result=pow(x,y); //pow() function exists inside math.h

printf(“the result is=%f\n”,result);

getch();
}


note: similarly you can get others' value.

program to get 'n' th power of expression

// program to get 'n' th power of given expression

#include<stdio.h>

#include<conio.h>
#include<math.h>

void main()

{

float a,b,n;

float result;

printf(“enter a and b\n”);

scanf(“%f%f”,&a,&b);
printf("enter value of 'n'\n");
scanf("%f",&n);

result=pow((a+b),n); //pow() function exists inside math.h

printf(“the result is=%f\n”,result);

getch();
}


note: this program gives you/us value of
(a+b)² or (a+b)³ or any other.

program to get sum of three nos.

// program to get sum of three nos

#include<stdio.h>

#include<conio.h>

void main()

{

float a,b,c;

float sum;

printf(“enter nos. for a,b and c\n”);

scanf(“%f%f%f”,&a,&b,&c);

sum=a+b+c;

printf(“the sum is=%f\n”,sum);

getch();

}