1. Type in and run the all programs presented in lecture note 7 and 8. Briefly describe the theory/ concept you learned from these program separately.

 Lecture note 06: Type Casting, Command Line Arguments and Defining Constants

• Type Casting 

Code 1

#include <stdio.h>

int main() 

{

int sum = 17, count = 5;

double mean;

mean = sum / count;

printf("Value of mean : %f\n", mean );

return 0;

}

Result

Value of mean : 3.000000

Code 2

#include <stdio.h>

int main()

{

int sum = 17, count = 5;

double mean;

mean = (double) sum / count; 

printf("Value of mean : %f\n", mean );

return 0;

}

Result

Value of mean : 3.400000

Code 3

#include <stdio.h>

int main() 

{

int i = 17;

char c = 'c'; /* ascii value is 99 */

int sum;

sum = i + c;

printf("Value of sum : %d\n", sum );

return 0;

}

Result

Value of sum : 116

Code 4

#include <stdio.h>

int main (void)

{

float f1 = 123.125, f2;

int i1, i2 = -150;

char c = 'a';

/* floating to integer conversion */

i1 = f1;

printf ("%f assigned to an int produces %i\n", f1, i1);

/* integer to floating conversion */

f1 = i2; 

printf ("%i assigned to a float produces %f\n", i2, f1);

/* integer divided by integer */

f1 = i2 / 100; 

printf ("%i divided by 100 produces %f\n", i2, f1);

/* integer divided by a float */

f2 = i2 / 100.0; 

printf ("%i divided by 100.0 produces %f\n", i2, f2);

/* type cast operator */

f2 = (float) i2 / 100;

printf ("(float) %i divided by 100 produces %f\n", i2, f2);

return 0;

}

Result

123.125000 assigned to an int produces 123

-150 assigned to a float produces -150.000000

-150 divided by 100 produces -1.000000

-150 divided by 100.0 produces -1.500000

(float) -150 divided by 100 produces -1.500000

*Type casting is when you tell the computer to change the type of a value to another type. For example, if you have a big number but you only need a smaller number, you can use type casting to make it fit. However, be careful: if the number is too big for the new type, you might lose some information. Also, if you have a decimal number and you change it to a whole number, you'll lose the decimal part.

• Command Line Arguments

Code 1