# C - Exercise 2

C Programming

Share In this exercise section of the tutorial we will write some C program.

## Write a program in C to multiple two integer values and print the result

To multiple we use the `*` multiplication operator.

``````/**
* file: multiply.c
* author: yusuf shakeel
* date: 2010-11-26
* description: program to find the product of two numbers
*/

#include <stdio.h>
int main(void)
{
int a = 10, b = 20;
int product = a * b;
printf("Product of axb = %d\n", product);
return 0;
}
``````

Output

``````Product of axb = 200
``````

## Write a program in C to find the area of a rectangle

Formula to find the area of a rectangle is `length * width`.

For this example we will use the floating point data type to store the value of the sides and the answer.

To print floating point value we pass "%f" in the printf( ) function.

``````/**
* file: multiply.c
* author: yusuf shakeel
* date: 2010-11-26
* description: program to find the area of rectangle
*/

#include <stdio.h>
int main(void)
{
float length = 12.34, width = 56.78;
float area = length * width;
printf("Area: %f\n", area);
return 0;
}
``````

Output

``````Area: 700.665222
``````

## Write a program in C to find the speed of a train if it covers 300 km in 2 hours

Formula to find speed is `speed = distance/time`.

To divide numbers we use the `/` division operator.

``````/**
* file: speed.c
* author: yusuf shakeel
* date: 2010-11-26
* description: program to find speed
*/

#include <stdio.h>
int main(void)
{
float
distance = 300,
time = 2;
float speed = distance / time;
printf("Speed: %f\n", speed);
return 0;
}
``````

Output

``````Speed: 150.000000
``````

## Write a program in C to convert 100 degree Celsius into Fahrenheit

Formula to convert temperature from Celsius to Fahrenheit is given below.

`F = C * 1.8 + 32`

Where F is temperature in degree Fahrenheit and C is temperature in degree Celsius.

``````/**
* file: temp.c
* author: yusuf shakeel
* date: 2010-11-26
* description: program to find temp
*/

#include <stdio.h>
int main(void)
{
float temp_c = 100;
float temp_f = temp_c * 1.8 + 32;
printf("%f deg C = %f deg F\n", temp_c, temp_f);
return 0;
}
``````

Output

``````100.000000 deg C = 212.000000 deg F
``````
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