Computer Programming C Laboratory: Unions C Programs
Write a C program to pass union to a function
C Programs using Structures & Unions
Write a C program to pass union to a function.
Eg: Raise a number to a power.
Evaluate y=xn, where 'x' and 'y' are floating point values and 'n' can be either float or int. If 'n' is an integer, then 'y' can be evaluated by multiplying 'x' by itself an appropriate number of times.
/* Program to pass union to a function.*/
#include <stdio.h>
#define N 3
#define NULL 0
/* Global declarations */
typedef union
{
float aa;
int bb;
}nvals;
typedef struct
{
float x;
char flag;
nyals exp;
} values;
void main()
{
/* Local definitions */
values a;
float power(values a);
int i;
float n,y;
/* Statements */
printf("Enter a value for X (ie., x power n)...........");
scanf("%f",&a.x);
printf("\nEnter a value for N(ie., x power n).............");
scanf("%f", &n);
i= (int)n;
a.flag=(i==n)?'i': 'f';
if(a.flag== 'i')
a.exp.bb=i;
else
a.exp.aa=n;
if(a.flag=='f'&&a,x<=0.0)
{
printf("can't raise a nonpositive number to a");
printf("\nfloating point power");
}
else
{
y=power(a);
printf("\ny = %.4f",y);
} /* if..else */
} /* main */
float power (values a)
{
int i;
float y = a.x;
if(a.flag== 'i')
{
if(a.exp.bb==0)
y=1.0;
else
{
for (i=1;i<abs(a.exp.bb); ++i)
y=a.x;
if (a.exp.bb<0)
y=1./y;
} /* if..else */
} /* if */
else
y=exp(a.exp.aa*log(a.x));
return(y);
} /* power() */
OUTPUT
Enter a value for X (ie., x power n).....5
Enter a value for N(ie., x power n).....2
y = 25.0000
EXPLANATION: This program refers to passing union to a function. The union nvals and structure values are declared initially. The main function reads the variable n from the terminal and check the condition a. flag='i' if yes then initialise a.exp.bb=i else a.exp.aa=n. if statement is executed and prints the true block otherwise prints the else block of statement. In function power() if statement checks the conditions a.flag==i. If condition is true then true block is executed or else block is executed and returned a value to the main program.
Computer Programming C Laboratory: Unions C Programs : Tag: C Programming : - Write a C program to pass union to a function
Computer Programming C Laboratory: Unions C Programs
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Computer Programming C Laboratory
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