# Fifth Chapter Lesson-13: Basic Mathematical problem related program

## At the end of this lesson-

• 1. You will be able to write a program for adding two numbers.
• 2. You will be able to write a program for subtracting two numbers.
• 3. You will be able to write a program for multiplying two numbers.
• 4. You will be able to write a program for dividing two numbers.
• 5. You will be able to write a program for converting temperature from Celsius to Fahrenheit.
• 6. You will be able to write a program for converting temperature from Fahrenheit to Celsius.
• 7. You will be able to write a program for determining area of a triangle where base and height have been given.
• 8. You will be able to write a program for determining area of a triangle where three arms have been given.
• 9. You will be able to write a program for determining area of a rectangle.
• 10. You will be able to write a program for determining area of a circle.

1. A program for adding two numbers.

```#include<stdio.h>
#include<conio.h>
main()
{
int a, b, c;
printf(“ Enter Two numbers: “);
scanf(“%d %d”,&a,&b);
c = a+b;
printf("Summation = %d",c);
getch();
}```

Practice: Write a program for adding five integer numbers.

2. A program for subtracting two numbers.

```#include<stdio.h>
#include<conio.h>
main()
{
int a, b, c;
printf(“ Enter Two numbers: “);
scanf(“%d %d”,&a,&b);
c = a-b;
printf("Subtraction= %d",c);
getch();
}```

3. A program for multiplying two numbers.

```#include<stdio.h>
#include<conio.h>
main()
{
int a, b, c;
printf(“ Enter Two numbers: “);
scanf(“%d %d”,&a,&b);
c= a*b;
printf("Multiplication= %d", c);
getch();
}```

Practice: Write a program for multiplying five integer numbers.

4. A program for dividing two numbers.

```#include<stdio.h>
#include<conio.h>
main()
{
int a, b;
float c;
printf("Enter Two numbers: ");
scanf("%d %d",&a,&b);
c= a/b;
printf("Division= %f",c);
getch();
}```

Practice: Write a program for determining average of five integer numbers.

5. A program for converting temperature from Celsius to Fahrenheit.

Relation among different temperature scale C/5 = F-32 / 9 = K-273 / 5

```#include<stdio.h>
#include<conio.h>
main()
{
int c, f;
printf("Enter celcious temperature :");
scanf("%d",&c);
f=9*c/5+32;
printf("Ferhenheight temperature:%d”,f);
getch();
}```

Practice: Write a programt for converting temperature from Celsius to Kelvin.

6. A program for converting temperature from Fahrenheit to Celsius.

Relation among different temperature scale C/5 = F-32 / 9 = K-273 / 5

```#include<stdio.h>
#include<conio.h>
main()
{
int c, f;
printf("Enter Ferenheight temperature :");
scanf("%d",&f);
c=5*(f-32)/9;
printf("Celcious temperature:%d”,c);
getch();
}```

Practice: Write a program for converting temperature from Fahrenheit to Kelvin.

7. A program for determining area of a triangle where base and height have been given.

Theory for determining the area of a triangle where base and height of triangle have been given,  Area=1/2×base×height

```#include<stdio.h>
#include<conio.h>
main()
{
int b,h;
float area;
printf("Enter Base & Height:");
scanf("%d %d",&b,&h);
area=.5*b*h;
printf("\nThe area is %.2f",area);
getch();
}```

8. A program for determining area of a triangle where three arms have been given.

Theory for determining the area of a triangle where three arms of triangle are a, b and c,                           Area= √(s(s-a)(s-b)(s-c))   [ s= half of perimeter]

half of perimeter, s=(a+b+c)/2

```#include<stdio.h>
#include<conio.h>
#include<math.h>
main()
{
int a, b, c;
float s, area;
printf("Enter three integer values:");
scanf("%d %d %d", &a,&b,&c);
s = (a + b + c)/2;
area = sqrt(s*(s-a)*(s-b)*(s-c));
printf("Area of triangle is = %f", area);
getch();
}```

9. A program for determining area of a rectangle.

Theory for determining area of rectangle where length and width have been given, Area=length×width

```#include<stdio.h>
#include<conio.h>
main()
{
int l,w,area;
printf("Enter the length & width: ");
scanf("%d %d",&l,&w);
area=l*w;
printf("\nThe area is %d",area);
getch();
}```

Practice: Write a program for determining area of a parallelogram.

Practice: Write a program for determining area of a square.

10. A program for determining area of a circle.

Theory for determining area of a circle where radius r, Area=πr2

```#include<stdio.h>
#include<conio.h>
main ( )
{
int r;
float area;
printf ("Enter integer value for radius:");
scanf ("%d", &r) ;
area = 3.1416*r*r;
printf("\n Area of circle =%f", area);
getch();
}```

## Lesson Evaluation-

Knowledge Based Questions:

Comprehension Based Questions:

Creative Questions:

Multiple Choice Questions:

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