C language programming Chapter 2 example source code

[Example 2-1]
# Include <stdio. h>
Int main (void)
{
Printf ("Hello world! \ N ");
Return 0;
}
[Example 2-2]
# Include <stdio. h>
Int main (void)
{
Printf ("programming is fun. \ n ");
Printf ("and programming in C is even more fun! \ N ");
Return 0;
}
[Example 2-3]
# Include <stdio. h>
Int main (void)
{
Int Celsius, Fahr;
Fahr = 100;
Celsius = 5 * (fahr-32)/9;
Printf ("Fahr = % d, Celsius = % d \ n", Fahr, Celsius );
Return 0;
}
[Example 2-4]
# Include <stdio. h>
Int main (void)
{
Double X, Y;
Printf ("Enter x (x> = 0): \ n ");
Scanf ("% lf", & X );
If (x <= 15)
{
Y = 4 * X/3;
}
Else
{
Y = 2.5 * x-10.5;
}
Printf ("Y = f (% F) = %. 2f \ n", x, y );
Return 0;
}
[Example 2-5]
# Include <stdio. h>
# Include <math. h>
Int main (void)
{
Int money, year;
Double rate, sum;
Printf ("Enter money :");
Scanf ("% d", & money );
Printf ("Enter year :");
Scanf ("% d", & year );
Printf ("Enter rate :");
Scanf ("% lf", & rate );
Sum = money * POW (1 rate), year );
Printf ("sum = %. 2f \ n", sum );
Return 0;
}
[Example 2-6]
# Include <stdio. h>
Int main (void)
{
Int Fahr, lower, upper;
Double Celsius;
Printf ("Enter lower :");
Scanf ("% d", & Lower );
Printf ("enter upper :");
Scanf ("% d", & upper );
Printf ("Fahr Celsius \ n ");
For (Fahr = lower; Fahr <= upper; Fahr)
{
Celsius = (5.0/9.0) * (fahr-32 );
Printf ("% d % 6.1f \ n", Fahr, Celsius );
}
Return 0;
}
[Example 2-7]
# Include <stdio. h>
Int main (void)
{
Int I, n, sum;
Printf ("Enter N :");
Scanf ("% d", & N );
Sum = 0;
For (I = 1; I <= N; I)
{
Sum = sum I;
}
Printf ("sum of numbers from 1 to % d is % d \ n", N, sum );
Return 0;
}
[Example 2-8]
# Include <stdio. h>
Int main (void)
{
Int denominator, flag, I, N;
Double item, sum;
Printf ("Enter N :");
Scanf ("% d", & N );
Flag = 1;
Denominator = 1;
Sum = 0;
For (I = 1; I <= N; I)
{
Item = flag * 1.0/denominator;
Sum = sum item;
Flag =-flag;
Denominator = Denominator 2;
}
Printf ("sum = % F \ n", sum );
Return 0;
}
[Example 2-9]
# Include <stdio. h>
Int main (void)
{
Int I, N;
Double product;
Printf ("Enter N :");
Scanf ("% d", & N );
Product = 1;
For (I = 1; I <= N; I)
{
Product = product * I;
}
Printf ("Product = %. 0f \ n", product );
Return 0;
}
[Example 2-10-1]
# Include <stdio. h>
# Include <math. h>
Int main (void)
{
Int I, N;
Double power;
Printf ("Enter N :");
Scanf ("% d", & N );
For (I = 0; I <= N; I)
{
Power = POW (2, I );
Printf ("Pow (2, % d) = %. 0f \ n", I, power );
}
Return 0;
}
[Example 2-10-2]
# Include <stdio. h>
Double fact (int n );
Int main (void)
{
Int I, N;
Double result;
Printf ("Enter N :");
Scanf ("% d", & N );
For (I = 0; I <= N; I)
{
Result = fact (I );
Printf ("% d! = %. 0f \ n ", I, result );
}
Return 0;
}
Double fact (int n)
{
Int I;
Double product;
Product = 1;
For (I = 1; I <= N; I)
{
Product = product * I;
}
Return product;
}