C language programming Chapter 4 example source code

[Example 4-1]
# Include <stdio. h>
# Include <math. h>
Int main (void)
{
Int denominator, flag;
Double item, PI;
Flag = 1;
Denominator = 1;
Item = 1.0;
Pi = 0;
While (FABS (item) >=0.0001)
{
Item = flag * 1.0/denominator;
Pi = PI item;
Flag =-flag;
Denominator = Denominator 2;
}
Pi = pI * 4;
Printf ("Pi = %. 4f \ n", Pi );
Return 0;
}
[Example 4-2]
# Include <stdio. h>
Int main (void)
{
Int num;
Double grade, total;
Num = 0;
Total = 0;
Printf ("enter grade :");
Scanf ("% lf", & grade );
While (grade> = 0)
{
Total = total grade;
Num;
Scanf ("% lf", & grade );
}
If (num! = 0)
{
Printf ("grade average is %. 2f \ n", total/num );
}
Else
{
Printf ("grade average is 0 \ n ");
}
Return 0;
}
[Example 4-3]
# Include <stdio. h>
Int main (void)
{
Int count, number;
Count = 0;
Printf ("enter a number :");
Scanf ("% d", & number );
If (number <0)
{
Number =-number;
}
Do
{
Number = Number/10;
Count;
}
While (number! = 0 );
Printf ("It contains % d digits. \ n", count );
Return 0;
}
[Example 4-4]
# Include <stdio. h>
Int main (void)
{
Int I, m;
Printf ("enter a number :");
Scanf ("% d", & M );
For (I = 2; I <= m/2; I)
{
If (M % I = 0)
{
Break;
}
}
If (I> M/2)
{
Printf ("% d is a prime number! \ N ", M );
}
Else
{
Printf ("No! \ N ");
}
Return 0;
}
[Example 4-5]
# Include <stdio. h>
Double fact (int n );
Int main (void)
{
Int I;
Double sum;
Sum = 0;
For (I = 1; I <= 100; I)
{
Sum = sum fact (I );
}
Printf ("1! 2! 3! .. 100! = % E \ n ", sum );
Return 0;
}
Double fact (int n)
{
Int I;
Double result;
Result = 1;
For (I = 1; I <= N; I)
{
Result = Result * I;
}
Return result;
}
[Example 4-6]
# Include <stdio. h>
Int main (void)
{
Int I, J;
Double item, sum;
Sum = 0;
For (I = 1; I <= 100; I)
{
Item = 1;
For (j = 1; j <= I; j)
{
Item = item * J;
}
Sum = sum item;
}
Printf ("1! 2! 3! .. 100! = % E \ n ", sum );
Return 0;
}
[Example 4-7-1]
# Include <stdio. h>
Int main (void)
{
Int I, Mark, Max, N;
Printf ("Enter N :");
Scanf ("% d", & N );
Printf ("Enter % d marks:", N );
Scanf ("% d", & mark );
Max = mark;
For (I = 1; I <n; I)
{
Scanf ("% d", & mark );
If (max <mark)
{
Max = mark;
}
}
Printf ("max = % d \ n", max );
Return 0;
}
[Example 4-7-2]
# Include <stdio. h>
Int main (void)
{
Int mark, Max;
Printf ("Enter marks :");
Scanf ("% d", & mark );
Max = mark;
While (Mark> = 0)
{
If (max <mark)
{
Max = mark;
}
Scanf ("% d", & mark );
}
Printf ("max = % d \ n", max );
Return 0;
}
[Example 4-8]
# Include <stdio. h>
Int main (void)
{
Int X;
Printf ("Enter X :");
Scanf ("% d", & X );
While (X! = 0)
{
Printf ("% d", X );
X = X/10;
}
Printf ("\ n ");
Return 0;
}
[Example 4-9]
# Include <stdio. h>
# Include <math. h>
Int main (void)
{
Int count, I, m, n;
Count = 0;
For (m = 2; m <= 100; m)
{
N = SQRT (m );
For (I = 2; I <= N; I)
{
If (M % I = 0)
{
Break;
}
}
If (I> N)
{
Printf ("% 6.d", M );
Count;
If (COUNT = 0)
{
Printf ("\ n ");
}
}
}
Printf ("\ n ");
Return 0;
}
[Example 4-10]
# Include <stdio. h>
Int main (void)
{
Int I, x1, x2, X;
X1 = 1;
X2 = 1;
Printf ("mm", x1, x2 );
For (I = 1; I <= 8; I)
{
X = x1 X2;
Printf ("M", X );
X1 = x2;
X2 = X;
}
Printf ("\ n ");
Return 0;
}
[Example 4-11-1]
# Include <stdio. h>
Int main (void)
{
Int children, women, men;
For (Men = 0; men <= 45; men)
{
For (Women = 0; Women <= 45; Women)
{
For (Children = 0; children <= 45; Children)
{
If (Men Women children = 45 & men * 3 women * 2 children * 0.5 = 45)
{
Printf ("Men = % d, women = % d, children = % d \ n", men, women, children );
}
}
}
}
Return 0;
}
[Example 4-11-2]
# Include <stdio. h>
Int main (void)
{
Int men, women, children;
For (Men = 0; men <= 15; men)
{
For (Women = 0; Women <= 22; Women)
{
Children = 45-men-women;
If (men * 3 women * 2 children * 0.5 = 45)
{
Printf ("Men = % d, women = % d, children = % d \ n", men, women, children );
}
}
}
Return 0;
}